Stellarvue SV70T-25FT 70 mm F/6 APO Triplet Refractor Telescope With 2.5" Feather Touch Focuser and Adapters
This is the Stellarvue 70 mm f/6 SV70T-25FT APO Triplet Refractor Telescope featuring the Feather Touch 2.5" dual speed, focuser (FFT2535B-A). This instrument uses the sharpest and highest contrast 70 mm objective (lens) Stellarvue have ever offered. (Read Jon Talbot's review of the SV070T in "Astronomy Magazine"). The focuser is set up to accept an optional dedicated .8X photographic field flattener/reducer converting the telescope into a 336 mm f/4.8 astrograph.
This telescope also comes with heavy duty dual rings and an airline carry-on sized travel case. This is not a mass produced scope using inferior glass and sloppy mechanics. This is a truly premier 70 mm Apochromat! The Stellarvue SV70T-25FT features a 70 mm f/6 (420 mm focal length) fully multi-coated, 3-element objective lens using an Ohara FPL-53 center element.
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 ratio optics make the 70 Apo Stellarvue's widest field imaging telescope, and the visual performance is simply stunning.
They offer riser blocks with or without longer rails. These allow the telescope to balance properly when camera gear is used that moves the center of balance over the focuser. The riser blocks raise the telescope 1.5" above the rail and this allows the rail to extend under the focuser and camera. The telescope can then be moved forward and balanced! Balance problems are gone!
Tube and dew shield: The SV70T comes with an aluminum tube and dew shield that is finished in Instrument White. Fittings are black anodized aluminum. The dew shield retracts reducing the length of the telescope when being stored. Extending the dew-shield minimizes dewing of the objective at night and serves as a glare shade during the daytime. Internal tube treatment: The inside of the main tube assembly is painted "ultra flat black" and is baffled to eliminate tube wall reflections.
This scope includes a 2.5" Feather Touch focuser with 2" and 1.25" compression ring adapters. A Starlight Instruments Feather Touch focuser provides precision positioning and is easy to use, and it also permits effortless focusing without shaking your telescope. This is a heavy-duty rack and pinion unit designed to carry a higher capacity. The focuser is fully rotating with a wide groove for smooth and precise rotation. The Feather Touch 10:1 reduction ratio and precision of design make this possible. Since there is virtually “Zero Backlash”, focusing at even high power is done without degrading your pointing. Feather Touch focusers are designed and built to last a lifetime.
The brake option was designed to allow users of refractor scopes the ability to gradually increase the friction between the pinion and the drawtube. In the non brake version design a thumb screw locks the pinion shaft and also increases the amount of drag on the drawtube. This system however has very little range when trying to control the drag.
The brake consists of an internal leveraged leaf spring that is tightened with a thumbscrew, thereby allowing a much greater control of the drag. The same thumbscrew is also used to lock the pinion shaft. The leveling base is used to collimate (align with the optical axis) the focuser. There are 4 screws that hold the base to the scope and 4 screws that push against the scope. These work to "push-pull" the base to adjust collimation.
Fine Focus Reduction Unit: This is the unit that allows very accurate focusing. It is typically a 10:1 planetary reduction assembly that makes focusing extremely precise and easy. Feather Touch were the original developer of this system for telescope use; it's the key to any of these focusers that allows precise focus with unparalleled reliability.
Aluminum hinged rings: The SV070T comes with two heavy duty, hinged aluminum mounting rings. Each ring has three screws top and bottom. Threaded holes are 1/4-20. There is one center hole, two holes spaced 1.5" apart. Use the included rail for telescope mounts using the Vixen style rail or use an optional TP6 for mounts that use the larger Losmandy style rail.
Case: The SV070T comes with a thickly padded, C70 airline carry-on case. The case holds the telescope and many optional items including a diagonal, eyepieces and a field flattener. Outside dimensions: 17" x 13.5" x 8". Inside dimensions: 14" x 10" x 5.5".
A 70 mm refractor gathers 100 times the amount of light the naked eye does. Although Dawes limit states maximum power for telescopes under good conditions is about 165 power for a 70 mm telescope, you can exceed this power on a steady night. This is a true Apochromatic triplet capable of high power when conditions permit. The only real limiting factor under steady seeing conditions is the light gathering limitation of this telescope.
Stellarvue telescopes and accessories are covered by a two year warranty. But it does not stop there. Since Stellarvue is a telescope manufacturer, they can repair your telescope for a very nominal fee years after it goes out of warranty, or should you accidentally drop it on concrete, or otherwise damage it. Buy a Stellarvue Telescope with confidence; their customer care is legendary.
Zygo Interferometer Optical Test Report INCLUDED: This test report shows the optic in the telescope purchased is 0.95 Strehl ratio or higher. This is Stellarvue's standard for all their current production of Apo triplets. Not a common quality feature that's available from other manufacturers!
|OBJECTIVE:||70 mm clear aperture, 420 mm focal length (f/6), Apochromatic triplet with Ohara FPL-53 center element - meets 0.95 Strehl ratio minimum standard, Zygo Interferometer test report is included with telescope|
|TUBE ASSEMBLY:||Machined aluminum tube painted Instrument White outside, ultra flat back inside|
|DIMENSIONS:||The main tube is 82 mm in diameter - the complete telescope is about 14 3/4” long with dew shield extended and about 12” long when retracted|
|DEW SHIELD:||Dew shield is 3.5" (88.6 mm) in diameter|
|WEIGHT:||The optical tube assembly weighs 4.4 lb; 5.6 lb with dual rings and Vixen rail|
|FOCUSER:||2.5" dual speed Feather Touch focuser with 2" and 1.25" compression ring adapters|
|RINGS:||Custom Stellarvue R70SET precision hinged rings - each ring has three 1/4-20 holes top and bottom with one in the center and two spaced 1.5” apart|
|PLATE/RAIL:||Includes vixen style rail|
|CASE:||The SV70T comes with a thickly padded, C70 airline carry-on case. The case holds the telescope and many optional items-Outside dimensions: 17"x13.5"x8", Inside dimensions: 14"x10"x5"|
|FINDER:||Optional-F001 red dot finder and the F002 multi reticle finder.|
|FIELD FLATTENER:||Optional-Recommend the SFFR70 focal reducer/field flattener|
|LIGHT GAIN:||100X (Human eye = 1)|