The SV80S-3SV is the wide field imaging system to buy if you want the best performance both visually and photographically. This system comes with an extremely high Strehl (highly accurate) triplet objective for the ultimate visual experience. Also included is a matched SFF3 field flattener that threads onto the 3" Stellarvue focuser for imaging. This system uses an over-sized 3" focuser that eliminates the vignetting seen when using full sized ccd chips and a 2.5" focuser. This focuser is robust, smooth and stable.
Also included are Stellarvue's riser blocks and a Losmandy-sized mounting rail. The riser block are necessary to position the telescope and camera in a balanced configuration. The visual/photographic system is specifically designed for imaging and has American made hardware with rings that bolt directly to the tube completely eliminating any felt flexure. The heavy duty 3" focuser is also hard mounted to the tube with a highly accurate rotator. This maintains alignment better than many rotating focusers on the market. The SV80S-3SV comes in a heavy duty, American made hard case that holds the telescope, riser blocks and rings as one unit. Merely take it from the case and slide it onto your mount.
The Stellarvue 80 mm f-6 apo triplet uses the sharpest and highest contrast 80 mm apochromatic triplet lens we have ever offered. This is not a mass produced scope using inferior glass and sloppy mechanics. This is a truly premier, hand-crafted 80mm apo. The Stellarvue SV80S-3SV features our 80 mm f-6 (480 mm focal length) fully multi-coated, 3 element objective lens with anOhara FPL-53 center element.
Fully multicoated apo triplet objective: The high Strehl, apochromatic triplet objective is triple-tested at Stellarvue to ensure that it performs perfectly. Lenses are better than .95 Strehl, better than our former Russian made lenses. We are now taking the time to provide interferometric test reports with each of our triplet refractors showing how the lens in your telescope actually performs. Hitting a Strehl ratio of at least .95 means your telescope will perform perfectly. These lenses rate even higher.
Each lens focuses light precisely and in addition the extreme broadband coatings on each surface enhance it even further. Using it visually, the stars appear vivid and the background, velvet black. Since these coatings transmit more than 99% in the visual spectrum and far above and below it, reflections seen on CCD images are eliminated. The relatively fast speed and high Strehl optics make the 80 apo an excellent wide field imaging telescope while the visual performance is simply stunning.
Tube and dew shield: Comes with an aluminum tube and dew shield that is finished in Instrument White powder coating. Get the tube and dew shield in a polished, red anodized finish for an additional $100. Fittings are black anodized aluminum. The dew shield is fixed and the dust cover threads into place.
Internal tube treatment: The inside of the main tube assembly is painted "ultra flat black" and the focuser is baffled to eliminate any tube wall reflections.
The SFF3 field flattener threads onto the draw tube. Simply un-thread the 2" visual back and thread the SFF3 in its place. The flattener is optimized to work with DSLR cameras and has a 55 mm back-focus. But this is a modular field flattener and the extensions behind the lens may be removed to create a much larger back-focus, over 100 mm, if needed.
If you are not sure about how to do this, give us a call. We can make modified adapters to work with your particular camera system.
We have developed a full frame, dedicated .74X reducer/flattener for this telescope. We expect this to be available by the end of April.
For visual use we highly recommend the Stellarvue Optimus eyepieces and our 2" quartz mirror star diagonal. This will provide you with the widest, sharpest field of view and maintain the extremely high contrast this apo lens delivers.