Orion HELICAL FINE-FOCUSING ADAPTER 13025 User's Manual
Contents
1. Orion Helical Fine Focusing Adapter 13025 Introduction Most modern telescopes come equipped with rack and pinion focusers These are adequate for focusing at low powers However when high powers are used the limitations of the focuser come into play and make finding the precise focus point difficult Worse the act of adjusting most telescope focusers applies force to the telescope resulting in unwanted vibrations and possibly moving the telescope off its target The Helical Fine Focusing Adapter solves these problems With just a twist of the fingers the observer has precise control over the eyepiece position The helical adapter has no backlash and allows much smaller focusing increments than can be achieved with standard focusers When used in conjunction with your tele scope s standard focuser the helical adapter will greatly enhance your focusing precision The gentle twisting action of the adapter means no extra force is applied to the tube during focusing so images remain steadier Installation The helical adapter will fit into any 2 focuser and accepts eye pieces with a barrel diameter of 1 25 only To install the helical adapter first remove any existing 1 25 adapter from the focuser if you have not already done so Then insert the adapter into the focuser and secure it with the thumbscrew s just like you would a 2 eyepiece Then insert the 1 25 eyepiece you wish to use into the adapter and secu2. re it with the thumbscrew om ORION TELESCOPES amp BINOCULARS Providing Exceptional Consumer Optical Products Since 1975 The helical adapter requires that the telescope have at least 9mm of inward focus travel to focus It requires 17mm of inward focus to utilize the full focus range of the helical adapter Most tele scopes will have this amount of inward focus travel Operation Initial coarse focusing should be done by adjusting the tele scopes s main focuser Once you are close to being in focus rotate the helical adapter with your fingers until the object comes into focus Go a little bit beyond sharp focus until the image just starts to blur again Then reverse the rotation of the adapter just to make sure you ve hit the exact focus point You will find the helical adapter easy to use when making small focusing adjust ments Do not turn the helical adapter past its natural limit of travel If you find that you cannot reach focus within the focus range of the helical adapter then make further coarse adjustments with the main focuser before using the adapter to fine focus Care and Maintenance With proper care your helical adapter will last a lifetime Store it in a protective box or eyepiece case when not in use Keep the adapter as clean as possible to ensure that the adapter threads have the smoothest motion possible Over time you may wish to add a small amount of light oil to the adapter s threads to aid in red
3. ucing friction Specifications Size Fits 2 focusers Eyepieces Holds 1 25 eyepieces Focusing design Helical Material Machined aluminum Grips Rubber Extension rate 16 per revolution Customer Support 800 676 1343 Email support telescope com Corporate Offices 831 763 7000 89 Hangar Way Watsonville CA 95076 IN 228 Rev B 02 09
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