Schneider Optics f/2.8 User's Manual
Contents
1. W Kasemann linear polarizing filter 0 0 eee 75246 B W Kasemann circular polarizing filter with MRC coating 16518 More Filters of size 67 EW on request Special lens hood with filter holder 0005 60013 B W UV inlay filter 74 mm with MRC coating 008 45366 B W Skylight inlay filter 74 mm with MRC coating 46585 Camera mounts Canon BOS scesicsi oiris teste RREN ENEN E ER esis eadeee rns 45733 Canon ED erie sa ena Ran eter eee aden oie ae ak SaaS a ee 19106 Contax Yashica i occ0ccisedanswitadiawere nie rE E ira e 19118 L ia R i scoiesearanaidsd side gisledediaueleene eens Lens available only through Leica M42 thread sass coud asiaetiedannteneescen kant enamel seam 19119 Minolta AF SONY Q ss cscs edeu eed ieu se tae nee raps Ene ania 19124 Minolta MD sse sctasse csectedmadacerce s aie eoeatra wn ents EREA EN 19105 Nikon Al ress eds cccerensap oem inta ne drann IEE yeas Heese ewes 19104 Olympus OM esscr eea n i et Meas tliat EN 19120 Pentax K Sams ng GX cs csissisviewseptosmaueaedutndisaiielindeneriss 19098 Specifications Relative aperture 0c cc eee eee 1 2 8 Effective focal length 008 29 2 mm Nodal point separation HH 57 9 mm Optical design csccs caseeeasecs ieiedaers 12 lenses in 10 groups Near distance correction Floating elements Image circle diameter2. 008 62 mm Image angle cc0cicciesiecisessaea coanea s 93 4 FORM At heft ca lonnat tease aaa RAEADR 24x36 mm Format diagonal 000 eee 43 2 mm Max displacements in landscape format 11 mm vertic 10 5 mm horiz in portrait format 10 5 mm vertic 11 mm horiz in both formats 9 5 mm diagonal Aperture settings 0 0 c cece eee eee 2 8 to 22 in half stop increm Setting of preset working aperture With stop down lever Nearest distance 000eee eee e ee 0 28 m Smallest full format object size 219x146 mm scale appr 1 6 Filter thread i cescasies sev acd sussigee ees 67 EW B W Filter Total length depending on camera mount appr 89 mm Max diameter nis sis cksaccin baw delndusias 75 mm 22 mm shifting knob Weight depending on camera mount appr 565 g Order number without camera mount 39789
3. 56 8 OB 0 7 Aperture setting ring Pre set aperture setting lever Shifting knob titi Index Knurled ring Camera mount Fixing screw for camera mount 4 General Description The SCHNEIDER PC SUPER ANGULON 28 mm f 2 8 is a very high quality wide angle lens for 35 mm analog and digital SLR cameras and provides a parallel shift facility like the sliding lens panel of professional large format cameras for correcting converging vertical lines and for manipulating the perspective especially for use in architectural and product photography Whereas normal 35 mm lenses have an image circle diameter of around 44 mm so that all four corners of the image are inside the image circle the PC SUPER ANGULON 28 mm f 2 8 provides an incredible 62 mm image circle Decentration up to 11 mm is possible within this area using a dove tail guide which can be adjusted easily and exactly The rotatable mount allows any desired shift direction Not shifted Maximally shifted Vertical shift is the most popular upward especially when photographing high buildings so that the camera does not have to be tilted upward and downward for product shots at an oblique angle or also for shots from high locations such as towers or mountains so that the camera does not have to be tilted downward When the camera is tilted either upward or downward perpendicular lines are not imaged as perpendicular but rather conv
4. 8 at both sides of the index mark Measuring the Exposure If the measurement is not carried out using a separate hand exposure me ter but using the TTL exposure meter integrated in the camera it is neces sary to measure in the centered position of the parallel shift while stop ping down to the working aperture because the arrangement and align ment of the measuring cell of almost all SLR cameras requires a direction of light incidence axially symmetrically to the lens bayonet With an oblique incidence through the lens displaced from the center some of the light bundle can be shadowed so that then less light is incident onto the mea suring cell A higher exposure would therefore be displayed or set with an automatic exposure system so that overexposure would result If the exposure is measured with a non shifted lens the camera must equally be aligned with the motif as if the motif would later also thus be photographed with a non shifted lens The darkening of the image visible in the viewfinder with a lens shifted a large distance does not carry over to the image and so also does not re quire any correction of the exposure This is due to a larger light fall off at the open aperture and due to the viewfinder system being aligned to an exactly centered lens and not being adjustable to the shifted lens as well as to the mirror not going down far enough for the low position of the lens in the event of a downward shift No vignetting oc
5. 9 Focusing and Depth of Field The focusing of wide angle lenses appears to be relatively non critical due to their large depth of field However careful focusing is actually necessary to utilize the high imaging quality of this lens to the full To ensure maxi mum brightness of the focusing screen and the best recognition of the ide al focusing point the aperture should be opened by pivoting the stopping down lever toward the shifting knob The aperture setting ring therefore remains on the set working aperture so that the aperture can later again be closed to the working aperture quickly using the stopping down lever directly before the shot without moving the eye from the viewfinder Focusing can generally take place before or after the parallel shift as de sired However if the LED focus display of an autofocus camera is used for manually focusing focusing must take place in the centered position i e with a non shifted lens because the AF sensor requires incidence of light approximately parallel to the axis but the light is obliquely incident on the sensor when the lens is shifted The parallel shift which then takes place after the focusing does not influence the set distance The f numbers at both sides of the index mark for distance and aperture indicate the depth of field If e g everything from 1 m to 3 m should be sharp the distance ring should be set so that the meter figures 1 and 3 are above the same f number here
6. PC SUPER ANGULON 28 mm f 2 8 User Manual Schneider Optics Inc 285 Oser Avenue Hauppauge NY 11788 USA Phone 631 761 5000 Fax 631 761 5090 info schneideroptics com www schneideroptics com Exclusive distributor for the USA List of Contents Name of Parts and Cross Section of the Lens 0 0eceeeseees 3 General Description peireira ra an Ana RETE sass ehenatens 4 Perspective Correction for Analog and Digital Photos 6 Large Image Circle for Lens Shifts up to 11 MM 0 ceeeeee 8 Fixing and Removing the Lens 00 ccce cece cece cece eects 10 Replacing the Mount for a Different Camera 0 00ceeeeeeeee 10 Parallel Shift sci cccsscssseosacttenensesesnriataiaudehendsaun cats taaswsascameaye is 11 Focusing and Depth of Field ssiccsiecccsvedsiieinibasactstisaasnesseasensonsen ete 12 Measuring the Exposure ici 2cs isi 00 siscaygcasquin debs peosisbsedesagesabacessd vlan 13 Filters Lens Hood and Camera Mounts 0 00 ccc cceseeeseeuees 14 Specifications 5st src sscgcses carectviesendsbianevhessneieteaeatsmmsecasadeesanieaae 16 Shape appearance and specifications are subject to change without notice Name of Parts and Cross Section of the Lens Focusing ring PC SUPER ANGULON Distance scale Depth of field scale Aperture scale 3 5 1B 15 05 1 3 2216 84 28 4
7. associated with substantial degrading If the rectangular image is distorted in the manner of a trapezoid for the parallel alignment of the converging lines the interpolation recalculation of the pixels required for this reduc Building not true to scale Building is true to scale vertically compressed but cropped on top Converging lines Horizon P Too much Horizon foreground opia 2E S13 a a TV TN es the sharpness produces just visible bluish violet or reddish brown color fringes at edges which have been made perpendicular under fairly high en largement and gives an image with incorrect proportions width to height ratio Since the final image must however be rectangular the triangular ar eas projecting on two sides have to be cut off which shows how many pix els which are important for high resolution are lost At the same time the surroundings almost always become very small at the narrow side of the trapezoid or the actual motif is even cropped The optical equalization ac tually during the shot with the PC SUPER Angulon 28 mm f 2 8 avoids this Building is true to scale and completely reproduced Too low Vertical lines are parallel Too wide Horizon Vertical shift of 7mm Large Image Circle for Lens Shifts up to 11mm The PC SUPER ANGULON 28 mm f 2 8 already produces an exceptionally flattened image at full aperture within the 62 m
8. curs at the actual taking Filters Lens Hood and Camera Mounts Only the oversized B W VVA filters of the size 67 EW can be used with the SCHNEIDER PC SUPER ANGULON 28 mm f 2 8 due to the extreme ly large image angle utilized at maximum shift up to 93 4 The following table shows the order numbers of the most popular filter types further types are available The two B W polarization filters shown there linear and circular have a special rotary mount and are dimensioned such that they do not produce vignetting even at maximum parallel shift of the lens An additional lens hood can however unfortunately not be used in combi nation with these polarization filters Furthermore a special lens hood with a filter mount is also available which does not produce vignetting at maximum shift The filter plates of 74 mm diameter which can be inserted there are held in this specal lens hood by an adapter ring belonging to the lens hood The following table also shows the order numbers of the camera mounts with which the lens can be fitted to match the new camera bayonet or thread if the camera system is changed The PC SUPER ANGULON 28 mm f 2 8 with Leica R bayonet mount is only available through the camera manufacturer s distribution channel Wide angle filters of size 67 EW Order no B W UV Filter with MRC coating 0c cece eee eee ee 40295 B W Skylight filter MRC coating 00 cece cece cece eee 14386 B
9. erge upward or downward which is very pronounced in wide angle shorts and can be very irritating These converging lines can be prevented with the PC SUPER ANGULON 28 mm f 2 8 just as with adjustable large format cameras If the adjustment range of 11 mm the clearance of the camera bayonet fixes this limit is not sufficient in extreme cases due to the oblique view being too steep the parallel shift of the lens largely prevents the sloped position of the con verging lines and furthermore also reduces the vertical compression of the imaged object which would otherwise occur The image then again corre sponds to the natural visual impression The rotary mount however also allows horizontal movements or a shift in a slanted direction e g to be able to take a frontal photograph without any distortion from a lateral location or a location with a slanted offset if this would otherwise be impossible due to an obstacle or potential reflections 6 Perspective Correction for Analog and Digital Photography The equalizing of converging lines or of unfavorable perspective due to a camera location made necessary by obstacles reflections or danger e g traffic is not only interesting for conventional analog photography but also for digital photography when higher quality demands are made While digi tal images or digitized scanned analog images can be equalized on the computer using image editing software such as Photoshop this is however
10. he lens is shifted perpendicular to the optical axis relative to the bayonet mount and so also relative to the taking format by rotating a knurled shift ing knob at a shaft which is elastically flexible to protect against its damage or injury to the user The lens tube can be rotated continuously to the left or the right in a rotary mount so that the parallel shift can be made in any desired direction It is best to grip the lens at the flattened part with the millimeter scales for this purpose 45 latch steps ensure a precise vertical or horizontal parallel shift as required The maximum path of 11 mm at both sides can be utilized to the full in the shift direction of the short image edge vertical in landscape format and horizontal in portrait format if the camera is stopped down to at least f 8 On a shift in the direction of the long image edge horizontally in landscape and perpendicular in portrait low vignetting of the image corners oppo site to the shift of objects on the same side of the shift because of the upside down image may occur over the last half millimeter It is therefore recommended only to utilize the shift path up to 10 5 mm here and to stop down to f 11 with more than 9 mm to avoid this vignetting in critical motifs The noticeable latch step at 9 5 mm should not be exceeded diagonally even at f 11 with parallel shifts since then the image corner decentered the most will contact the image circle edge see image on page
11. he tripod Natural size mage circle 44 Image circle 62 M With a shift to the left or to the right the shifting knob can always be at the left so that the right hand can hold the camera and remain on the release button With a diagonal shift the adjust ment path should not go beyond the lock noticeable at 9 5 mm to pre vent vignetting Fixing and Removing the Lens The lens is available in a connection socket to match different 35 mm SLR camera systems and is inserted into the camera bayonet or thread for fas tening to the camera such that the red dot on the connection socket is op posite the corresponding marking on the camera To lock the lens in the bayonet or thread and to release it again the lens should be rotated at the knurled ring and not at the tube since the latter is not rigidly connected to the bayonet or thread due to the rotary mount and since there is therefore a risk that the tube will turn without the bayo net or thread engaging and tightening up to the stop Replacing the Mount for a Different Camera The camera mount of the lens is fastened using Phillips screws and can be replaced to match the new camera on a change of the camera system The user can make the refitting him or herself using a size zero Phillips screw driver The table on page 15 shows the camera systems for which camera mounts can be obtained and gives their order numbers Parallel Shift T
12. m image circle which is thus twice as large in area relative to the image circles of other 35 mm lenses Sharpness and contrast are increased further in the central area used with out shift by stepping down slightly to f 4 to f 5 6 Sharpness contrast and brightness naturally drop outside this area due to the huge image angle with an open aperture The full aperture with a decentered lens is there fore only intended for the image composition and the focusing A good im aging performance is obtained at the edge when stepping down further in dependence on the adjustment path an aperture of 11 is recommended at maximum shift Distortion and vignetting are exceptionally low While the image quality falls considerably in the close range with many wide angle lenses the good imaging properties of this lens are maintained thanks to floating elements a distance coupled axial shift of a lens ele ment group relative to the remaining system This makes this lens very in teresting e g for model shots The adjustment takes place at a shifting knob on a flexible shaft which is easy to grip and sensitive in operation Millimeter scales on mutually oppo site sides allow comfortable reading in any shifting knob position Since the shift is possible at both sides of the zero position the most favorable ori entation can always be chosen e g irrespective of the shift direction with the knob at the bottom with free hands or rather at the top at t
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