SV70ED is a compact ED doublet refractor telescope. It has a unique, hand figured 70 mm f-6 lens using Ohara glass.
Fully multicoated objective: Hand figured ED lens has high contrast with several extreme broadband coatings on all four lens surfaces. These coatings transmit light above and below the visual spectrum, which is important to minimize reflections seen on ccd images.
Lightweight aluminum tube and dew shield: The tube and dew shield are made of aluminum, work well when using the telescope as a guidescope and the dew shield retracts to reduce the length of the telescope. The dewshield minimizes dewing effects.
Threaded aluminum cap: The objective cap threads to the dew shield and has the raised silver Stellarvue SV logo.
Internal tube treatment: The tube interior is painted black inside and is baffled to eliminate tube wall reflections. The focuser drawtube is threaded inside and painted ultra flat black to reduce reflections.
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 extremely fine focusing. The reducer in the Stellarvue focuser uses a hardened stainless shaft and precision ball bearings. It has 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 astrophotography. 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. There is also a third 5 mm threaded hole on the tube in front of the focuser for positioning a reflex finder further forward. The focuser is fully rotating. To rotate the focuser, simply loosen the rotation knob.
Vixen shaped mounting base: The SV70ED has an L-shaped mounting base for mounting the telescope to a heavy-duty camera tripod or to most telescope mounts. The underside of the mounting base has two cork pads and two 1/4-20 threaded holes. The shape of the L-shaped mounting base is identical to a Vixen rail, so it will work with most telescope mounts. If you plan to mount this telescope on a larger mount that uses the Losmandy rail, the L-shaped mounting base will attach directly to our TP6 (Losmandy sized) plate with two screws.
Supplied accessories: The SV70ED comes with a small travel case that is foam lined. This airline carry-on sized case will hold the telescope, and some accessories. In addition to the supplied accessories, you will need a star diagonal or erecting prism, eyepiece(s) and a mount or tripod.
Light gathering and magnification power: The SV70ED gathers 100 times the amount of light the naked-eye can to reveal faint objects in space. Magnification power is dependant upon the eyepiece being used. Different eyepieces provide different magnification powers. Since our 70ED uses a highly accurate, hand figured objective lens that has been tested three times in the USA, these telescopes are free of coma and astigmatism seen in many import telescopes. This provides sharper details when viewing at higher powers. Dawes limit states that the maximum power for a 70 mm telescope under good conditions is about 165 powers. Check the Recommended Accessories section to make the best choice for eyepieces.