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Stellarvue SV80ST-25SV


Stellarvue SV80ST-25SV

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Product Description

This is the Stellarvue 80 mm f-6 apo triplet made using our deluxe 2.5" dual speed, rack and pinion focuser. It uses the sharpest and highest contrast 80 mm apochromatic triplet lens we have ever offered. The focuser is threaded for photographic field flatteners sold below and has 1 1/4” and 2” compression ring visual adapters. This telescope also comes with heavy duty dual rings and a C19 heavy duty travel case.

We are currently working on more of these telescopes. Order now to get in line for delivery early October. 

Additional Info 

The Stellarvue SV80ST-25SV is our lowest priced 80 mm apo triplet telescope. The 80 apo features an 80 mm f-6 (480 mm focal length) fully multi-coated, 3 element objective lens with an Ohara FPL-53 center element.

Fully multicoated apo triplet objective: The high Strehl, apochromatic triplet objective provides extremely high contrast, and several extreme broadband coatings are used on all six lens. This boosts contrast: the stars appear vivid and the background, velvet black. These coatings transmit light far above and below the visual spectrum, which is important to minimize reflections seen on ccd images. The relatively fast speed and high strehl optics make the 80 apo an excellent wide field imaging telescope and the visual performance is stunning.

Tube and dew shield: The standard model (SV80ST2-25SV) comes with an aluminum tube and dew shield that is finished in Stardust 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.

Difference between aluminum and carbon fiber tubes: The aluminum tube of the SV80ST cools down rapidly but is one pound heavier than a carbon fiber tube. The lighter carbon fiber tube takes a longer to equalize. We are able to precision machine the tube components in the aluminum tube so each telescope is precisely and perfectly aligned to a slightly higher degree than a carbon fiber tube with its bonded metal parts. while this is not usually a problem with longer focal length tubes, we have found it is an issue with such a short focal length tube. The other stated advantage to carbon fiber is the tube does not expand and contract as temperatures change. Imagers like this feature as they feel refocusing will not be necessary during the night. However, it should be pointed out that since this instrument is short, a large portion of the optical train is still aluminum. Since the tube is short and the focuser long, this stated advantage is probably not as valid as with our other carbon fiber telescopes with longer tubes. In the case of the 80 mm f-6 apo, most imagers and visual users alike prefer the aluminum tube for its immediate cool down, ultra precise alignment and minimal difference in weight. This is opposite the case for the SVR90T which has a much longer carbon fiber tube and is significantly lighter than its aluminum counterpart.

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.

CNC machined clamshell mounting ring. The telescope comes with our R90C clamshell ring with flat base. The base has three 1/4-20 holes spaced 20 mm apart. The clamshell also has 10-32 screws on top and on the side for mounting finder scopes or other accessories. 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 R90set dual hinged rings in place of the clamshell.

Mounting Rings: The SV80ST2 comes with beefy, aluminum, dual hinged rings. Astro-photographers prefer individual hinged rings since they can be widely separated which eliminates flexure. Our newest SV80ST2 tube is 3 9/16” in diameter making it a perfect and precise match for Feather Touch and Stellarvue 2.5” focusers. Due to the larger diameter of this new precision tube, our cnc clamshell ring will not fit over the SV80ST2 tube.

Supplied accessories: Telescope comes with mounting rings, 2.5” focuser, 2” and 1.25” adapter, caps and case. 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. An 80 mm telescope gathers 131 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 our 80 apo 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 states that the maximum power for telescopes of this size is about 186 power for a 80 mm telescope, under good conditions but it is well known that highly accurate apo triplet refractors can exceed Dawes limit. The real limit to you observing will be the atmosphere and the amount of light you will need to properly illuminate the field. 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.

Product Specifications:  SV80ST2-25SV 80mm Apochromatic Triplet




80mm diameter, 480mm focal length (f6), apochromatic triplet with Ohara FPL-53 center element

Tube Assembly

Machined aluminum tube - instrument white outside, ultra flat black inside


The main tube is 90 mm in diameter. The complete telescope is 18 3/4” long with dew shield extended and 16” long when retracted.


The optical tube assembly weighs about 5.8 lbs. The dual rings weigh about 1.2 pounds total.


3.94" diameter fully retracting dewshield with cap


2 1/2” dual speed Stellarvue rack and pinion focuser threaded for field flatteners, with compression ring and  1 1/4” compression ring adapter




Stellarvue R90SET precision hinged rings. Each ring has five 1/4-20 holes top and bottom with one in the center and two spaced 1.5” and 60mm apart. If you prefer the R90C clamshell, contact us and we can exchange it for the dual rings.




C19 Heavy Duty airline carry-on case



Field Flattener


Light Gain

131x (human eye = 1)

Theoretical Resolution

1.5 arc sec (Dawes Limit)

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