Premier Stellarvue Optics! These are not mass-produced optics. The SVX80 objective is hand figured in our optical shop in Auburn California to the highest optical specifications. We address spherical issues, astigmatism, trefoil and coma by individually hand crafting each objective by machine and by hand. We provide a certified test report with every apo triplet telescope we manufacture demonstrating its optical prowess. This lens, with its optical design and high optical accuracy outperforms less expensive lenses of standard commercial quality.
The SVX80 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 SFF4 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 blocks 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 SVX80T 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.
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: It comes with an aluminum tube and dew shield that is finished in Instrument White powder coating. 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 SFF4 field flattener threads onto the draw tube. Simply un-thread the 2" visual back and thread the SFF4 in its place. The flattener is provided with the included SFF4 is optimized to work with DSLR cameras. It has adapters that give it a 55 mm back-focus which is the standard DSLR spacing. CCD cameras may have different back focal lengths. If you obtain a CCD camera that does not have a 55 mm back focus, you will need different adapters to get optimal results. Fortunately, our SFF4 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. We can make modified adapters to work with your particular camera system. If you are not sure about how to do this, give us a call.
The combination of the 3" drawtube on this telescope and the large flattener result in a field with practically zero vignetting when compared against a typical reducer/flattener. This is the reason we provide the flattener with the SVX80ST-3SV.
As an option, you may now purchase our new SFFR80T-3SV .74X reducer flattener and convert this f-6 imaging system into a 360 mm focal length f-4.5 wide field astrograph! Our new .74X reducer is made specifically to thread into the 3" focuser draw tube. It will not work with our 80 mm refractors that use 2" or 2.5" focusers (all of them we made until we introduced this model) as it is too large to fit inside those focusers. We made this reducer larger than the .8X reducers we make in order to provide better optical correction and much less vignetting. This unit is now available and may be ordered by selecting the option at the top of this page!
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.
Free shipping: Order now and when ready the telescope will ship free to the lower 48 states only. Shipping will be either UPS or Fed Ex whichever has the lowest rate.