Stellarvue SV102ED Refractor Telescope
The Stellarvue SV102ED is a 102mm f-6.95 ED doublet objective with fully rotating 2" dual speed Crayford focuser, 1.25” compression ring adapter and the best cnc clamshell mounting ring. Stellarvue's clamshell ring allows for easy one touch balance adjustment.
Merely loosen the clamshell knob, slide the tube to perfect balance and tighten. The clamshell comes with a long Vixen style rail that attaches directly to most mounts. This is the OTA only, case, diagonal and eyepieces are available separately.
The Stellarvue SV102ED is a four inch doublet ED refractor telescope. This scope uses a high performance hand figured ED lens. The Stellarvue SV102ED is designed as a visual telescope but can be used photographically when used with the SFF7-21 field flattener.
Fully multicoated ED objective lens:
The Stellarvue SV102ED is powered by a 102 mm f-6.95 doublet objective lens made with an Ohara FPL-51 ED element. Color correction and contrast is superior to a typical 102 mm achromat. The lenses are hand figured by a master optician to a high Strehl ratio. This telescope's optics have several layers of extreme broadband coatings applied to all of the lens surfaces.
This further enhances the contrast of the image:the stars appear vivid and bright against a dark black background. These coatings transmit light above and below the visual spectrum making them well suited for ccd imaging.
Stardust white aluminum tube and dew shield:
The aluminum tube and dew shield is painted in a lustrous and beautiful stardust white finish. This white finish will stand out against the black anodized aluminum fittings giving this telescope a high-end, classy look.
The dew shield can either be extended or retracted. Extension reduces dewing at night can cut out the light from those blaring street lamps. The dew shield also serves as a lens shade during the day.
Internal tube treatment:
The inside of the tube assembly is painted "ultra flat black" to cut down on excess reflection. The inside of the focuser is threaded, creating ridges. These ridges are painted, reducing the most commonly found type of reflected glare. This treatment provides better glare reduction than focusers that only have the ridging to prevent glare. All of these methods add up to provide the outstanding contrast of the ED lens.
Dual speed Crayford focuser with precision bearings:
The 2" Crayford focuser uses a compression ring and has three thumb screws to secure accessories and cameras firmly in place. A compression ring 1.25" adapter with 2" filter thread is also provided. The focuser has three focusing knobs, one on the left and two on the right.
The single knob on the left and a larger knob on the right provide coarse focusing. On the right side is a second, slightly smaller, brass colored fine focus knob. This fine focus knob has an 11-1 rotation reducer, allowing for fine and accurate focusing.
The reducer in the Stellarvue SV102ED focuser uses a hardened stainless steel shaft and precision ball bearings, giving it greater longevity than some competitive dual speed focusers. A tension adjustment set screw is positioned under the focuser and a thumb screw allows for locking the focuser when engaged in astro-photography.
The drawtube is inscribed with a millimeter scale on top. Two 5 mm threaded holes on top of the focuser allow for the attachment of two separate finder scopes. The focuser is fully rotating, only requiring the loosening of a knob.
Aluminum hinged rings:
The SV102ED comes with two hinged, aluminum mounting rings. Each ring has five screws, top and bottom. Threaded holes are 6mm. There is one center hole, two holes spaced 1.5" apart and two holes spaced 60 mm apart. Use the optional TP-10 rail for telescope mounts using the Vixen style rail or use the optional TP6 for mounts that use the larger Losmandy style rail.
What else do you need?
In addition to the supplied accessories, you will need a star diagonal or erecting prism, eyepiece(s) and a mount. You may also want to buy the C9S case and a reflex or optical finder scope.
Light gathering and magnification power:
The purpose of a telescope is to gather light and magnify the apparent size of the object being viewed. A 110 mm refractor gathers 247 times the amount of light of the naked eye. This will reveal faint objects in space.
Magnification power (the increase in relative size of the object being viewed) is dependant upon the eyepiece being used. Different eyepieces provide different magnification powers. Since this telescope uses a highly accurate, hand figured objective lens and has been triple tested, these telescopes are free of coma and astigmatism seen in many imported telescopes.
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