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Stellarvue SV90T 90mm Triplet

Stellarvue spent three years designing what they consider to be the ultimate grab and go telescope. This telescope is as light and portable as an 80mm short tube, yet it delivers 90mm of stunning full apochromatic performance. An apo triplet design using a Fluorite center element was chosen ensure that the instrument was devoid of false color, provided excellent definition and a perfect star test. The SV90T Fluorite Triplet telescopes are highly rated by users.

Item #ProductStock StatusPriceShipping
SV-90T90mm FPL-53 Triplet (Pearl White)
Normally Ships in 7-10 Days
$1,695.00Get Shipping Quote
SVR9090mm Raptor FPL-53 Triplet (Carbon Fiber)
Normally Ships in 7-10 Days
$1,995.00Get Shipping Quote
SV-90TBV90mm Flourite Triplet Binoviewer Ready (White)
In Stock - Ships Same Day (business days)
$2,195.00Get Shipping Quote
Stellarvue SV90T 90mm Flourite Triplet apochromatic refractor telescope

The Stellarvue SV90 is available in three configurations:

SV90T

This is the basic edition, featuring Ohara FPL-53 glass, a dual speed 2-inch Crayford with 11-1 ratio, precision stainless bearings, micrometer scale and refractor brake. Weight is only 8 lbs with clamshell! Includes C7 side reinforced case with heavy duty foam lining. This telescope is offered in a Pearl White finish.

SVR90 Raptor

The Raptor edition features Ohara FPL-53 glass, a lightweight carbon fiber optical tube and dewshield that cuts the weight down to 6 lbs. including the mounting rings. The Raptor also features the legendary Feather Touch focuser, dual hinged mounting rings made on a cnc machine, F2 multi reticle finderscope and C7 side reinforced case with heavy duty foam lining.

SV90TBV Flourite Binoviewer Ready

The SV90TBV features Calcium Fluorite lenses and comes ready for either standard or binoviewer use. The main tube is made of two sections. Use as it comes for normal viewing, or remove the rear section of the main tube for use with binoviewers. In this mode, the SV90 does not need any optical correctors. Precision machined tube and dewshield. Includes a C7 side reinforced case with heavy duty foam lining. The SV90TBV also includes the 2" Feather Touch Focuser.

Shown with optional finder

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Optical Specifications: Stellarvue SV90T 90mm Triplet
Type Apochrmatic Refractor
Lens Cell Type Air Spaced Triplet
Aperture (mm) 90 mm
Aperture (in.) 3.5 inches
Focal Length 630 mm
Focal Ratio f/7
Limiting Visual Stellar Magnitude <p><b>Limiting Stellar Magnitude</b><br /> This is a measure of the faintest star that can be seen with a telescope under ideal conditions. We include this figure for the purpose of comparing two telescopes of different apertures using a consistent scale. Many manufactures publish this specification. Unfortunately manufactures use different methods to calculate this figure, rendering the numbers useless for direct head to head comparison of different brands of telescopes. </p> <p>Limiting stellar magnitude is the sum of the naked eye limiting magnitude and the telescopic gain. The naked eye limiting magnitude varies by location due to local light pollution; therefore, it is an assumption. This figure could be 6.5 or higher at some of the darkest locations, but less than 2 in the middle of a large city. Our calculations assume a figure of 5, which one might typically find 30-40 miles from a major urban area. </p> <p>Telescopic gain is a direct function of aperture. No attempt has been made to compensate for the affects of central obstructions or different types of optical coatings.</p> 12.4 Magnitude
Accessories and Features
Finder None
Focuser 2-inch Crayford with 1.25-inch eyepiece adapter
Star Diagonal None
Accepts 2" Eyepieces <p><b>Telescope Eyepiece Formats</b><br /> Virtually all telescope eyepieces available today conform to one of two barrel diameter standards: 1.25 or 2 inches. Most amateur astronomers will be perfectly content with 1.25" eyepieces. Two-inch eyepieces have only one inherent advantage. That advantage is a potentially larger field of view, but not every telescope can take advantage of that potential. </p> <p>A Telescope and eyepiece work together to collect parallel light rays over a large area, compress those light rays down into a smaller area, and the re-orient them so that they are nearly parallel once again. Essentially light arriving at a telescope with any given aperture is compressed into a smaller aperture or exit pupil. The ratio of the telescope aperture to eyepiece exit pupil determines the magnification.</p> <p>There are cases at very low magnifications where the eyepiece barrel diameter becomes the constraint on maximum field of view. The eyepiece barrel itself actually blocks some of the available light that the telescope is collecting, thus limiting the field of view. Two-inch eyepieces overcome this constrain by allowing a larger light cone to enter the eyepiece. We must conclude this discussion by restating that 2" eyepieces have no inherent advantage over 1.25" eyepieces other than the potential for a larger field of view when used with a telescope capable of benefiting from that advantage. </p> Yes
Eyepiece Calculator
Enter your eyepiece's specifications:
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Exit Pupil: <p>Exit pupil represents the diameter of the column of light exiting the eyepiece. Magnification is simply the ratio of telescope aperture to exit pupil. Fox example, using a telescope with 100mm aperture and an exit pupil of 2mm yields a magnification of 50X.</p> <p>There are both upper and lower limits to the useful range of exit pupils. The typical human eye pupil dilates to a maximum of 7mm when fully dark adapted. This figure decreases with age. Using an exit pupil that is larger than this upper limit simply spills the light onto an area of the eye not capable of receiving data. At the opposite end of the range, a smaller exit pupil means less area on the eye is collecting data. Images brightness decreases with decreasing exit pupil. Deep space objects grow dimmer rapidly as the exit pupil falls below 1 mm. The planets also start to become noticeably dimmer when the exit pupil falls much below 0.5 mm.</p> <p>Our eyepiece calculator provides warnings and error messages based upon the value of the exit pupil. These are intended to be guidelines as opposed to hard rules. There is no harm in violating these gidelines, but your enjoyment of the telescope may be diminished if you do. </p>
 
 
Recommended Accessories: Stellarvue SV90T 90mm Triplet
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UD2Stellarvue Deluxe 2" Dielectric DiagonalThe Stellarvue deluxe 2 inch star diagonal features a 99% reflective dielectric coating that enhances contrast and deep sky performance. Each unit features a 1/10 wave mirror and is individually tested to ensure alignment and optical accuracy.$139.00
SFF7-21Stellarvue Field FlattenerThis system will flatten the field photographically to broaden the in-focus image circle. It is optimized for f/7 optical systems, but may be used on any refractor with a focal ratio of f/6 to f/8.$265.00