DEMKMEIER BINOWVIEWER ADDITIONAL INFORMATION:What is the OCS? | SCT Richfield Star-Sweeper | Instructions
The "Optical Corrector System" (OCS) is a peripheral Optical System that allows the DEEPSKY BINOVIEWER to reach focus in a telescope where the focal plane formed by the primary mirror or lens remains in a fixed position. While some telescope designs like Schmidt Cassegrain Telescopes have the ability to "push" the focal plane forward by moving a spherical primary closer to the concave secondary, the majority of telescopes cannot perform this maneuver. Therefore, a means must be implemented to place the focal plane far enough forward so that the eyepieces placed in a binoviewer can form a focused image of the focal plane image where your eyes can intercept this image. This is why our patent-pending multi purpose 1.25" or 2" OCS has such important implication for the advancement of binoviewing. Now, the OCS allows the binoviewer to operate at almost true power. Low power application are now possible! In the past, big Dobsonian owners cut their poles down or had two focusers with one in an extended focus position In an extended focus position, a larger secondary mirror is needed for this to work. This is because the light cone is intercepted when it is wider. The expense and hassle of rigging up such a dual configuration made it impractical and expensive. Furthermore, coma from the primary mirror is corrected with use of the OCS. So, it is clear that there are many advantages to realize the use of the OCS.
 Our optics are custom produced. The l 2" OCS optics are dielectric broadband AR coated and reflectivity is less than 0.3% at each of the four optical air to glass surfaces. ZYGO Inferometric test data and transmission data will accompany all 2"OCS systems. Settle for nothing less for your low power binoviewing applications. The 2" OCS works in low power 1.3x mode and high power 2.5X mode all OCS housings are tremendously versatile and have our special black-hole baffling, not a painted on surface. All 2" OCS systems includes an additional 2" hollow nosepiece so that T the System can be used at 2.5X in addition to 1.3X lower.
 Note that the Deepsky Binoviewer has a threaded female receptacle. "A" is inserted into said threaded binocular viewer receptacle so that "A" becomes a 2" nosepiece. "A" is hollow and without an optical component. "C" may then be attached directly to "A" which has internal threads. "C" has a male threaded member with threads that mate with "A". The Focal Reducer Lens (FRL) is located inside of "C" in the anterior section where indicated on drawing. When "A" and "C" are mated in this way, focus may be achieved in any SCT. "B" is a variable adapter which may be placed between "A" and "C". "B" threads into "A" until flush or can be threaded into "A" partially. Note that there is a lock ring "D" on "B" which will lock "A" and "B" in firm position when that lock ring is threaded down so that it is flush with "A". The further that "B" is threaded out from "A", the more focal reduction takes place. However, the more difficult it will be for an SCT to reach focus. Since the distance is determined by the user, the focal reducing factor may be set for the greatest possible with a given telescope. Note that with this system, an additional cell identical to "C" but containing a telenegative lens may be substituted for increasing the effective focal length (EFL) of the telescope. This would allow high power 2.5X applications to be utilized. This greatly increases the flexibility of the telescope and eyepiece for a variety of observing applications. The Star*Sweeper™ optical elements are totally custom produced by us and are highly figured and Fully Multi-Coated with Broadband 0.3% dielectric coatings for the ultimate in contrast when used with your Premium Deepsky Binoviewer or Standard Deepsky Binoviewer. Both "A" and "C" are threaded for 48mm filters. All tubes include our special Stealth Baffling™.
NEWTONIAN for 1.2X MAGNIFICATION: Remove hollow tube nosepiece from binoviewer first. Screw part "O" into binocular viewer. Screw part "C" to part "O". Screw part "S" to Part "C". For a 2" focuser, use a 1 ¼" adapter. NEWTONIAN for 3X+ MAGNIFICATION: Screw hollow nosepiece into binoviewer replacing part "O". Screw part "S" onto end of SCT tube. Place in focuser. If this configuration will not focus, screw part "C" into the SCT tube and then screw "S" onto the end of "C". REFRACTORS USING 1 ¼" STAR DIAGONAL for 1.2x MAGNIFICATION: Remove nosepiece supplied with binoviewer and screw part "O" into your binoviewer. Screw part "S" into telescope side of star diagonal into filter threads. Slide binoviewer into star diagonal like a typical eyepiece. For 3X MAGNIFICATION: Screw nosepiece into binoviewer after removing Part "O". Screw part "S" into filter threads on telescope side of star diagonal. (SOME REFRACTORS NEED an EXTENTION TUBE for this MODE). For 2.5x MAGNIFICATION: Screw nosepiece into binoviewer and screw part "S" into the filter threads of the SCT tube. (may not work with all refractors). REFRACTORS WITH A 2" STAR DIAGONAL: for 1.2X MAGNIFICATION: Remove the hollow nosepiece shipped installed in your binoviewer. Replace this hollow tube with part "O". Screw part "S" into the side of part "T" that will place part "S" INSIDE of your star diagonal on the telescope side when "T" is screwed into your star diagonal filter threads. High power in your REFRACTOR: Hollow nosepiece replaces part "O". Part "S" is screwed directly into the SCT tube. (May not work with all refractors). HIGHER power in REFRACTOR: Hollow nosepiece is screwed into binoviewer. Part "S" is screwed to part "T" so that "S" is located on inside of telescope side when "T" is screwed into filter threads of star diagonal. (may not work with all refractors). HIGHEST power in REFRACTOR: Hollow nosepiece is screwed into Binoviewer. Part "S" is now threaded on opposite side of "T" so that when "T" is threaded into telescope side of star diagonal using filter threads, "S" sits outside of the diagonal. (may not work with all refractors).
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