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Additional Info

The Stellarvue SVR90T-25SV Raptor Series is a very lightweight 90 mm apo  triplet telescope. Using a structurally stable carbon fiber tube and dew shield, this  telescope weighs less than some 80mm telescopes! The SVR90T-25SV features our proven 90 mm f-7 (630 mm focal length) objective lens with an Ohara FPL53 center element. This is a highly rated visual and photographic instrument.  This  telescope is well suited for both visual work and astrophotography using one of two dedicated field flatteners.

Fully multicoated apo triplet objective: The high Strehl, apochromatic triplet objective provides extremely high contrast views. To further enhance this high level of contrast, extreme broadband multi-coatings are  used on all six air-to-glass surfaces. This boosts contrast, making the stars appear vivid and the background velvet black. These coatings transmit light above and below the visual spectrum. This is important to minimize reflections seen on ccd images. The lens design is the same as the SV105 objective making this an excellent imaging scope when used with the SFF3 or SFF7 series field flatteners. Think of this as the 90 Apo that is as light and compact as an 80ED scope. 

Carbon fiber tube and dew shield: The tube and dew shield are made of carbon fiber to reduce weight and increase the telescope's  good looks. The carbon fiber dew shield has black anodized aluminum end rings.  The dew shield retracts further reducing the length of the telescope when being stored. When the telescope is used, this dew shield may be extended to minimize dewing of the objective at night and to serve as a glare shade during  the daytime. 

Internal tube treatment: The main tube interior is lined with black velvet and is properly baffled to eliminate any tube wall  reflections. Most of the reflected glare seen in small refractors comes  from the inside of the focuser draw tube. To eliminate draw tube reflections the tube is painted ultra flat black and textured. Reflections in the optical path are further reduced using edge blackened objective elements.

2.5" Stellarvue visual/photographic focuser: Many years in the making, our new smooth and stable dual speed, 2.5” focuser provides a full 3.2" of travel. This focuser is perfect for visual use and imaging. The rear of the draw tube is threaded to accept our new dedicated SFF7-25 photographic field flattener for most cameras and the SFF3-25 for large chip cameras. The focuser comes with two compression ring eyepiece adapters that are 2” and 1.25” respectively. The Stellarvue focuser is a heavy duty rack and pinion unit designed to carry a higher capacity. It has an ultra-smooth (10:1 Ratio) fine focus control to attain perfect focus every time. An internal brake system allows the user to adjust capacity. The focuser is fully rotating with a wide groove for smooth and precise rotation. All of the features add up to one of the finest dual speed focusers available today.

Machined aluminum hinged mounting rings. The telescope comes with our R90set hinged rings. The rings have five 1/4-20 holes top and bottom that include a center hole and two sets of holes spaced 1.5” and 60 mm apart. If your mount requires either a Losmandy or Vixen style rail, these are available separately. Use the TP6 for Losmandy system and the TP14 for the Vixen system. This telescope is also available with the R90C cnc clamshell in place of the dual rings. The clamshell has an “easy-one-touch” single knob that allows the user to immediately balance the telescope by turning only a single knob. Visual users generally prefer the clamshell and imagers most often select the dual rings. Contact us if you want the clamshell instead of the dual rings.  

Supplied accessories: The SVR90T Raptor comes with the Ultimate (C18) Travel Case. This case will hold the  telescope, star diagonal, reflex finder and numerous eyepieces. 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 purchase 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 90 mm refractor gathers 165 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 dependent upon the  eyepiece being used. Different eyepieces provide different magnification powers.  Since this telescope uses a highly accurate, hand figured objective lens and is  triple tested 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, which is the stated maximum power for telescopes under good  conditions is about 213 power for a 90 mm telescope. Check the Recommended  Accessories section to make the best choice for eyepieces.

Two year warranty and Stellarvue Service: Stellarvue  telescopes and accessories are covered by a two year warranty. But it does not  stop there. Since we are a telescope maker, we can repair your telescope for a  nominal fee years after it goes out of warranty should you accidentally drop it.  Buy a Stellarvue with confidence. Our customer care is legendary.

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