Schneider Kreuznach PC Tilt/Shift Lenses
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1. this point is already absolutely in focus you are fin ished and can continue with step 10 8 If however the apparently highest object H in the background is sharper above point B the tilt angle was still too small Then you have to increase the tilt angle a little e g by 1 to 2 depending on how close the best sharpness is to point B and return to the above step 6 9 If however the apparently highest object H in the background is sharper below point B the tilt angle was already too high Then you have to reduce the tilt angle a little e g by 1 or even less if the point of best sharpness is already very close to the point B and again have to return to the above step 6 here You will then have finished the Scheimpflug tilt after running through the steps 6 7 8 or 6 7 9 focusing on A checking at B correcting the tilt angle two or three times A Schneider wW KREUZNACH 10 You now only have to stop down to the correct f number for the required depth of field You can find this by taking test shots in which you check the critical image details N and F see figure at the bottom left on the LCD of the camera or via a connected computer 11 Point N lies on the near border of the depth of field wedge at the camera side and is its most blurred point there Point F as the point furthest away is the most blurred point at the border remote from the camera The blur is of equal magnitude at both points Sinc2. and thanks to the Scheimpflug tilt you no longer have to stop down to achieve sufficient DOF see page 9 This manual will help you make optimum use of the advantages of your new lens ih im Ty So O mp 0 pT C 150 120 90 60 w 00 E oe CANON EOS O Pre set aperture Set the working aperture with the aperture setting ring Open the aperture with the blue pre set aperture set ting ring for framing and focusing Then stop down with this blue ring before releasing the shutter N the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH Extra large image circle for shift and tilt The image circle diameter of normal lenses is only slightly larger than the diagonal of the taking format e g 44 mm with a full frame 35 mm format which has a diagonal of 43 3 mm It is thus ensured that there is no vignetting darkening in the image corners However the PC TS lenses have a much larger image circle of 79 2 mm 2 8 50 HM 87 8 mm 4 5 90 mm HM both for the full frame 35 mm format and 153 mm 5 6 120 HM for formats up to 45 mm x 60 mm This gives you enough freedom for parallel shift and Scheimpflug swing or tilt up to the mechanical limit de fined by the aperture of the camera bayonet mount even when parallel shift and swinging or tilting are car ried out in any direction simultaneously Conventional shift lenses for th
3. reserve 12 the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH
4. A Schneider pp KREUZNACH Schneider Kreuznach PC Tilt Shift Lenses User Manual PC TS SUPER ANGULON 2 8 50 HM PC TS MAKRO SYMMAR 4 5 90 HM with interchangeable bayonet mount for Canon EOS Nikon Pentax K or Sony Alpha PC TS APO DIGITAR 5 6 120 HM Aspheric with bayonet mount for Mamiya Phase One System www schneiderkreuznach com a Satu M gt LU FAR 5 6 Asi OT gl TOUT W ii PAININ UOCCEU AACA AANA a ill l 330 E J OOOOH i W Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve 1 the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH Schneider Kreuznach PC Tilt Shift Lenses Congratulations You have made the right choice You have purchased a PC TS lens from Schneider Kreuznach because you want the best possible image reproduction quality while having the option to correct perspective and to enjoy greater depth of field through tilting according to Scheimpflug s principle Your new PC TS lens PC perspective control TS tilt amp shift allows both a parallel shift to reduce or even completely eliminate converging lines or perspective distortion keystone correction and a swinging or tilt ing of the lens according to Scheimpflug s rule in order to better utilize depth of field DOF without an increase in diffraction from further stopping down th
5. GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve 4 the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH Schneider Kreuznach PC Tilt Shift Lenses Recommended base setting of swing tilt and shift This section explains how the lens swing or tilt and the parallel lens shift should be set Their purpose and ad vantages for improved image quality are described and illustrated from page 8 onward The PC TS lens should always be stored ready for use in the base setting untilted without shift to ensure ease of use and to avoid errors The sliding rings A for swing or tilt and C for shift should be set whenever possible to the angular values for the direction of swing or tilt and shift which are most common in your individual use The angular value at the ring A for the swing or tilt should always be set first because the whole lens is rotated in front of the ring A and any shift direction set at the ring C shift would then change The direction of swing or tilt and shift is always the direc tion in which the angular value 0 faces on both rings Because the most frequent lens tilt is a downward tilt the sliding ring A should
6. R camera without any post processing in correct to scale proportions and without losses in resolution due to pixel spread and interpolation Building not to scale but vertically compressed Converging lines 444993 Horizon 7 s aa ra 1 _ ota pee ii about 13 Converging lines x Too wide K A Narrow K a gt rectified with the help of a computer Building precisely to scale but its top is cropped Horizon Too much foreground Optical axis Building precisely to scale and not cropped Vertical lines are parallel Horizon Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve 8 the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH Greater depth of field through lens tilt Most subjects are three dimensional and of varying depth A perfectly sharp image is however only possi ble for a lens at a distance fixed by focusing on a planar sensor if the object is likewise planar All details in front or behind this become more and more blurred with in creasing distance from this sharpness plane even more so the further the lens aperture is opened It is therefore normally necessary to stop down by sev eral f stops for a sufficient depth of field Unfortunately the diffraction also increases in an amount critical for high resolu
7. age circles of all three PC TS lenses are equal to this task A Schneider wp KREUZNACH Drawing in actual size for 35 mm full frame sensor format Max 12 mm Sm n Test po TS image circle 192 The image circle of all PC TS lenses is larger than neces sary for parallel shifts only This is due to have a reserve for additional lens tilts according to the Scheimpflug rule When the lens is tilted down the image circle moves up The loss a caused by the tilt will be compensated by the reserve see above the gain c will be available when shifting down Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve 3 the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH A Schneider bh A KREUZNACH Schneider Kreuznach PC Tilt Shift Lenses PC TS SUPER ANGULON 2 8 50 HM Specifications This lens has a standard focal length for a full frame Effective focal length 51 75 mm Filter accessory mount M 95 x 1 and bayonet VIII 35 mm format and produces perspectives which ap Optical design 9 elements in 9 groups Lens shade Accessory threaded pear very natural It is therefore recommended mainly Coating MC multicoating Total length 128 4 mm EOS bayonet for architectural photography as well as for town and Max sensor format 24 mm x 36 mm Maximum diameter 108 mm w o tripo
8. be set so that the angular value 0 is at the bottom the angular value 180 can then be read at the top To allow the sliding ring A to be rotated together with the whole front part of the lens this ring first has to be pushed forward by around 1 mm and held there Grip the ring A with your thumb and index finger press it forward at its front bead and turn the whole lens in the desired direction The ring snaps into the indicated 30 steps when released to prevent any accidental change of the adjustment The parallel shift direction which is most common for your purposes will depend on whether you usually shoot subjects in a three side view holding the camera facing obliquely downward such as products and packaging for advertising downward parallel shift or whether your shoot objects which project far above the horizon e g buildings and architecture upward paral lel shift Slide the ring C about 1 mm forward and at the same time rotate the front part of the lens for downward shift so that the angular value 0 is at the bottom or 180 is at the top For upward shift in contrast turn the lens so that 0 is at the top Ring C also snaps into the displayed 30 steps when released If necessary rotate the tripod collar after loosening the locking bolt so that the base is at the bottom again Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve the right of modifica
9. coating Total length 138 8 mm EOS bayonet tance for arranging the subject and provides extra Max sensor format 24 mm x 36mm Maximum diameter 108 mm w o tripod mount space for the lighting The narrower angle of view Image circle diameter 87 8 mm at infinity Weight we x 11104 means that the backgrounds do not have to be so wide Maximum shift reserve 12 mm in every direction Tripod mount thread 3 8 and 1 4 360 rotary The sharpness is excellent throughout the focus range Maximum tilt angle 8 in every direction to enable shots of very small objects smallest format Focusing 2 4 44 4 manually Available camera monts Canon EOS Nikon filling object field 142 mm x 95 mm with the long helical mount in addition the Scheimpflug tilt ensures a much better DOF and the parallel shift provides more attrac tive product shots without converging lines or with greatly reduced converging lines PC TS APO DIGITAR 5 6 120 HM ASPHERIC Nearest distance Largest image scale Smallest subject size Aperture setting Aperture setting range Specifications 0 57 m from sensor plane 1 4 w o accessories 95 mm x 143 mm manually pre set setting ring 4 5 to 32 in 1 3 EV steps Sony Alpha Pentax K This apochromatically corrected lens for the digital me Effective focal length 123 62 mm Filter accessory mount M 95 x 1 and bayonet VIII dium format of the Mamiya Phase One system pro Op
10. d we have found the course of the ideal Scheimpflug plane for our subject It is these two points A and B which therefore have to be imaged as sharp after the tilting of the lens with an open aperture With a tilted lens the wedge of depth of field rises when focused to a shorter distance and falls when focused to a farther distance E i p Scheimpflug principle HT Not sharp Ee Scheimpflug rule When the lens is tilted the image plane i the image principal plane p which is close to the aperture plane in most cases and the Scheimpflug plane plane of best sharpness s intersect in a common line S The depth of field is an almost symmetrical wedge relative to plane S How to find the Scheimpflug plane y plane of best sharpness To find the optimum Scheimpflug plane plane of optimum sharpness look for the highest point X in the foreground and then seen from this point look for the apparently highest point Y in the background If you imagine a board that loosely lies on the subject it touches the subject in X and Y Then you will get two Scheimpflug focusing points A at the half height of X and B on the half height of Y The Scheimpflug plane runs along a line through A and B Far Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve 10 the right of modification without further notice 2011 05 1069035 Jos Schneider O
11. d mount landscape imagery It is also suitable for product shots Image circle diameter 79 2 mm at infinity Weight 1400 g which require a much greater depth effect greater spa Maximum shift reserve 12 mm in every direction Tripod mount thread 3 8 and 1 4 360 rotary tial perspective than is possible with a longer focal Maximum tilt angle 8 in every direction length lens otherwise preferred for this purpose With Focusing 4 4444 4 4 manually Available camera monts Canon EOS Nikon parallel shifting buildings can be reproduced without converging lines up to 100 higher twice as high above the horizon in landscape format or up to 67 higher in portrait format than with lenses of the same focal length without such a shift option PC TS MAKRO SYMMAR 4 5 90 HM Nearest distance Largest image scale Smallest subject size Aperture setting Aperture setting range Specifications 0 65 m from sensor plane 1 9 2 w o accessories 220 mm x 330 mm manually pre set setting ring 2 8 to 32 in 1 3 EV steps Sony Alpha Pentax K This lens with a focal length of 90 mm is the ideal solu Effective focal length 90 72 mm Filter accessory mount M 95 x 1 and bayonet VIII tion for product shots with full frame 35 mm format The Optical design 6 elements in 4 groups Lens shade Integrated recessed lens slightly longer focal length creates a longer taking dis Coating MC multi
12. e 35 mm format with an image circle diameter of usually approximately 58 mm allow for vignetting free shift of 10 7 mm in landscape mode but only 8 4 mm in portrait mode The PC TS 35 mm lenses allow 12 mm in both orientations that is almost 50 more shift in the portrait mode which is particularly important for tall objects like buildings As the full scale drawing on the right shows there are still sufficient reserves for any additional lens swing or tilt according to Scheimpflug for better utilization of DOF even with a diagonal shift of 12 mm which would only be possible by 7 3 mm with a lens of 58 mm image circle diameter Angled shots of objects with vertical edges are no less problematic with regard to converging lines than archi tectural shots typically associated with this type of pho tography However due to the much shorter taking dis tance for product shots a much smaller DOF results and makes it necessary to stop down even further which results in unwanted diffraction blur It is only pos sible to stop down less by using lens tilt according to Scheimpflug see page 9 Because the lens has to be tilted downward the image circle moves upward in the opposite direction to the parallel shift to remedy the converging lines This reduces the total shift If however the upward parallel shift is combined with a downward Scheimpflug tilt for building shots the up ward image circle displacements are summed The enormous im
13. e aperture Name of parts Bayonet for lens cap Pre set aperture setting ring Focusing ring Locking wing bolt for rotating tripod mount ring Rotary lens shifting ring Sliding releasing ring with angular scale for setting the direction of the parallel shift Rotary lens tilting ring Sliding releasing ring with angular scale for setting the direction of the lens tilt Interchangeable camera specific bayonet lens mount The PC TS lenses 4 5 90 HM and 5 6 120 HM are built exactly like the 2 5 50 HM shown above up to the tripod mount ring Only because of their longer focal length are their focusing rings aperture setting rings and pre set aperture setting rings positions slightly different Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve Aperture setting ring Ht Base plate with 1 4 and 3 8 thread mount tifa Lloar and reducing sharpness Parallel shift and lens swing or tilt can be carried out independently of one another in any desired direction vertically horizontally or obliquely thanks to separate rotary mounts This also provides you with the advantages usually as sociated with adjustable technical cameras to a degree sufficient for most applications with your single lens re flex camera simpler and faster You no longer have to spend a lot of time on the computer correcting the key stone effect with the accompanying loss of sharpness see page 8
14. e lens has been shifted before tilting the lens the subject in the frame will be shifted a bit by the lens tilt Then it may be necessary to correct the field of view by a small additional shift depending on the focal length and the direction of the lens tilt an increase or a decrease of the lens shift may be necessary However in every case after any tilt and any shift with a tilted lens the lens must finally be refocused precisely before shoting Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve 7 the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH Schneider Kreuznach PC Tilt Shift Lenses When and why is shifting recommended If high buildings are photographed from a short dis tance away or if products and packagings are photo graphed from a three side oblique view the camera normally has to be pointed upward or downward The sensor plane or film plane is consequently not parallel to the perpendicular edges of the subject The subject is therefore imaged as converging upwardly or down wardly like a trapezoid which is commonly called con verging lines The object height is furthermore repro duced in shortened form that is not correct to scale This effect can only be avoided by using a lens with such a large angle of view that the object is completely captured without tilting the lens So called shift le
15. e we want both points to be sharp we have to stop down so far that both appear sharp Take a test shot at aperture 8 for example If N and F are still not sharp at high enlargement stop down fur ther and check the sharpness again Repeat until N and F are sharp enough for your application Since memory is no longer expensive you can alterna tively take several shots after one another e g at f 8 f 11 f 16 and f 22 and then later when you are back at home take the time you need on a large computer monitor to select that shot in which N and F have the required sharpness at the widest aperture At the end of this process you will have to stop down less and thus have less diffraction blur than would be necessary without a Scheimpflug tilt You also have the further advantage of a shorter exposure time under available light or less need of flash energy less expen sive flash unit for flash shots in the photo studio At first glance it may appear self explanatory that the foreground always has to be at the bottom However if a lateral Scheimpflug swing is carried out e g to relo cate the sharpness plane to an obliquel house front the foreground is at the left or right If e g a ceiling fresco is taken obliquely from below and the sharpness is placed in the ceiling the foreground is at the top Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve 11 the r
16. ight of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH A Schneider bh A KREUZNACH Schneider Kreuznach PC Tilt Shift Lenses What is residual perspective and how do get it If the camera only has a small upward or downward tilt any converging lines will also be slight It is however still possible to improve the esthetics of an image by correcting the distortion using a shift of an adjustable technical camera or of a shift lens The steeper the tilt the more irritating the converging lines and the more important the correction If however with a very steep upward or downward view the converging lines are aligned exactly vertically a tall building will look as if it is becoming wider toward the top We expect that a very high object becomes smaller at the top where it is further away It is therefore meaningful not to align converging lines completely parallel but to leave a slight slant as a residual per spective in order to maintain a natural appearance Test shots with different amounts of keystone correc tion have shown that a correction of 70 to 80 or a residual perspective of 30 to 20 produces the most natural impression depending on the subject This leads us to the following recommendation You can correct the keystone effect completely by shift ing up to around 5 mm in 35 mm format or up to around 8 mm with the larger sensor format of the Mamiya Phase One s
17. ing of the lens always results in a displacement of the plane of optimum sharpness of the subject and therefore in a displacement of the DOF zone surround ing it It is therefore always necessary to refocus after tilting The meter scale is not valid with a tilted lens See page 10 for a detailed explanation how to find the optimum tilt angle in practice Shift the lens in the selected direction If the desired direction of the shift has been set e g upward for very high buildings 0 at the top of ring C or downward for product shots in a three side view 0 at the bottom of ring C as described on the left the required amount of shift can be set by turning the ring D clockwise The displacement path in millimeters can be read off at the area F of ring D on the camera side The maximum shift is 12 mm in each direction When shifting with a tilted lens the sharpness will change so that it is always necessary to refocus A Schneider pp KREUZNACH After having set the direction of the lens tilt with ring A in this picture with 0 downwards the lens can be tilted up to 8 in this direction by turning the ring B clockwise seen from the camera side The tilt angle can be seen on the scale E Mi OTT I od a TM ay By turning the ring D clockwise the lens can be shifted into the direction that has been se lected before in the direction of 0 on ring C which is upwards in this picture If th
18. ning angle of this wedge increases almost sym metrically as stopping down increases 100 m Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and reserve 9 the right of modification without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH Schneider Kreuznach PC Tilt Shift Lenses How to find the Scheimpflug tilt angle We want to tilt the lens so that the resulting slim depth of field wedge yellow area in the figure on the right includes all subject zones to be imaged as sharp Be fore we determine the required tilt angle we first have to find the optimum position of the Scheimpflug plane s within the subject as follows The subject zone being imaged has to be packed into a wedge between two planes which is as small as pos sible as in the second figure between the bottom board and a board imagined to be weightless placed directly onto the subject This board would lie on the highest object in the foreground X and on the apparently high est object of the background Y from the perspective of the foreground as seen from the eye symbol in the figure on the right and not from the camera These two objects X and Y have to be found in the subjec to be imaged as sharp If we now connect the point A at half the height of the highest small object X in the foreground to point B at half the height of the apparently highest object Y in the backgroun
19. nses have such a large angle of view and can be shifted upward downward and usually also sideward relative to the camera body so that the camera can be used without tilting for shots obliquely upward downward or in any other direction While it is also possible to correct the irritating distor tion of converging lines by using image processing software on a computer this requires a much greater amount of time than by shifting while photographing it also results in a substantial deterioration of image qual ity due to the pixel spread with subsequent vertical and horizontal interpolation resolution losses of way over 50 and with a parallel orientation of the con verging lines the ratio of width to height changes so that the subject appears vertically compressed or stretched within the image A vertical distortion correc tion is therefore required with a further loss of sharp ness due to repeated pixel spread and interpolation in which it is difficult to restore the correct proportions of width to height the mathematical calculation is very complicated the procedure is very time intensive This is why adjustable technical cameras are preferred for architecture industry and product photography be cause they allow for a correct lens shift to eliminate or attenuate converging lines and to maintain the propor tion of width to height The new Schneider Kreuznach PC TS lenses give you the benefits of this shifting with an SL
20. ptische Werke GmbH 1 First fix the pivot direction For this purpose press the rear sliding ring A on page 6 forward and turn the lens so that the angular value 0 faces the foreground of the subject This will be downward in most cases 2 If you want to correct converging lines by shifting set the front sliding ring C on page 6 for a shift direction upward so that the angular value 0 is at the top for a shift direction downward so that it is at the bottom 3 Now align the camera with the tripod head so that the sensor plane and thus also the screen of the LCD monitor is perpendicular 4 Shift the lens turn the ring D on page 6 until you have the desired picture section If the shift distance of 12 mm is not enough use the tripod head to tilt the camera a little more until the picture section is correct the residual perspective resulting from this is almost always esthetically pleasing see page 12 5 Roughly focus on the foreground and tilt the lens by rotating the rearmost rotating ring B on page 6 to 2 on the PC TS SUPER ANGULON 2 8 50 HM 3 on the PC TS MAKRO SYMMAR 4 5 90 HM 4 on the PC TS APO DIGITAR 5 6 120 HM ASPHERIC 6 Focus on point A at half the height of the highest object in the foreground since the sharpness is always displaced on tilting you have to refocus after every tilt 7 Check the sharpness at point B at half the height of the apparently highest object in the background If
21. ticaldesign 6 elements in 4 groups Lens shade Integrated recessed lens vides the adjustment possibilities of professional tech Coating aaa MC multicoating Total length 135 6 mm nical cameras Depending on the digital back used in Max sensor format 45 mm x 60 mm Maximum diameter 108 mm w o tripod mount formats from 33 mm x 43 mm to 40 mm x 54 mm the Image circle diameter 153 mm at infinity Weight aoaaa 1110 g focal length corresponds to the 35 mm equivalent of Maximum shift reserve 12 mm in every direction Tripod mount thread 3 8 and 1 4 360 rotary 98 mm to 80 mm The PC TS APO DIGITAR 5 6 120 HM is therefore ideal for product shots and satisfies the highest demands thanks to its high resolution and ex Maximum tilt angle FOCUSING 242244 Nearest distance 8 in every direction manually Available camera mont 0 84 m from sensor plane Mamiya Phase One ceptional image quality The parallel shift and the Largest image scale 1 5 3 w o accessories Digital back P25 194mm x 259 mm Scheimpflug swing and tilt ensure a perfect perspective Smallest subject size depending in the digital back Digital back P30 P40 175 mm x 234 mm and maximum DOF Aperture setting manually pre set setting ring Digital back P45 195 mm x 260 mm Aperture setting range 5 6 to 32 in 1 3 EV steps Digital back P65 214mm x 285 mm Jos Schneider Optische Werke
22. tion sensors this is usually noticeable in full frame 35 mm format from about f 8 or f 11 and in the digital medium format from around f 11 or f 16 However lens tilt according to Scheimpflug is a proven way of increasing depth of field while at the same time reducing the required stopping down The secret of this f stop 16 For depth of field from very near to very far intense stopping down is needed e g to f 16 the red line indicates the plane of best sharpness 3m 5 83 m By tilting the lens according to the Scheimpflug rule the plane of best sharpness s red line can better ge be adjusted to the course of the subject then f stop 11 provides sufficient depth of field A Schneider pp KREUZNACH technique is not a bypassing of physical laws which is naturally not possible but rather the tilting of the DOF zone at right angles to the optical axis top figure so that the spatial extent of the subject is adapted better bottom figure For this purpose the lens is tilted by an angle such that the image side principal plane p of the lens which can be thought of as the aperture plane in simplified terms extends through the line of intersection S which is formed by the image plane i and the Scheimpflug sharpness plane s shown in red The DOF zone included by two parallel planes with a non tilted lens becomes a DOF wedge with the edge E in front of the line of intersection S on this tilting The ope
23. tion without further notice 2011 05 1069035 Jos Schneider Optische Werke GmbH In the standard configuration the rings B and D must be turned to the left completely Before shifting down ring C must be turned with 0 down Tilt the lens in the selected direction If both a swing or tilt and a shift of the lens are required the swing or tilt direction must always be set first at the sliding ring A and only then the shift direction at ring C The actual tilt movement can be carried out later before or after the shifting The tilt always takes place in the direction in which the angular value 0 on sliding ring A faces If a downward tilt is required the sliding ring A should be pressed forward and the lens turned until the value 0 faces down 180 can then be read at the top If the tilt should be to the left because a surface or wall running close to the camera at the left hand side needs to be in sharp focus from the front to the rear the lens should be turned so that the value 0 on the sliding ring A faces to the left 270 will then face upward Once the tilt direction has been fixed the tilt angle that is the magnitude of the tilt can be set at the rotating ring B by turning it clockwise viewed in the taking di rection The value of the tilt angle can be read off at the area E of the rotating ring B facing toward the camera above the triangular mark at 0 or at 180 from ring A The tilt
24. ystem If a greater shift is required for a full correction you should check whether the image might not look better with some residual perspective It may be a good idea to prepare one completely cor rected shot and one with around 25 residual per spective to allow you to make a later decision on which of the two images is better for your purpose You may ask How do I set 25 residual perspective First perform a full correction with an exactly perpen dicular sensor or LCD monitor of the camera Read off the amount of shift on the scale F in the bottom figure on page 7 e g 8 mm Then reduce the shift by 25 this value is half of a half and is so particularly easy to calculate in our example this is by 2 mm to only 6 mm However this does not give you any residual per spective only the wrong image section So you now have to tilt the camera precisely by such a small angle that you have the same image section again as previ ously with the complete parallel shift of 8 mm This small tilt gives you the very weak converging lines enough for a natural effect but not with so much slant that it looks unnatural Converging verticals without lens shift ro i ny 4 Wee eae i oe Total correction of distortion uar E BIT HET YS A 3 25 residual distortion PE i wy i We TY a i SR oe 2 3 Jos Schneider Optische Werke GmbH is certified ISO 9001 We accept no responsibility for any errors and
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