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Stellarvue SVQ100 Astrograph


Stellarvue SVQ100 Astrograph

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Product Description

This is a new version of the SVQ100 with a Stellarvue 3" dual speed rack and pinion focuser. Using the SV focuser we have been able to reduce the price by over $800!

The SVQ is a unique, four-element telescope designed for full-frame imaging. It is made on a very short optical tube assembly, well within airline carry-on size limits so you can safely take it anywhere you go. Field is absolutely flat and color correction is virtually “reflector-like” thanks to an advanced optical system using Ohara FPL53 optical glass.

We wanted our quad to be extremely stable to maintain alignment and easily hold the heaviest astro cameras. For this reason, we employ our oversized 3” dual speed, rack and pinion focuser with  high lifting capacity. The telescope comes with threaded camera adapters for both the 42 mm and 48 mm over-sized t-rings. We also have a number of larger, optional adapters available for direct, wide aperture attachment to your full frame camera.

The SVQ is optimized for imaging.  Using a visual adapter the instrument can be used with a diagonal and eyepiece. While the overall visual correction of an astrograph is not the same as a high Strehl APO triplet, the SVQ will work as a flat field “richest field telescope” with excellent color correction. 

100 mm f-5.8 Quad made with Ohara FPL-53. Includes a Stellarvue 3" focuser, dual hinged mounting rings, and threaded extension. The SVQ100 now comes with both 42 mm and 48 mm T ring adapters. So you can directly thread your T ring equipped camera directly to the focuser.  These telescopes are assembled and triple tested one at a time. They are in continuous production and are shipped on a first come, first served basis. The sooner you order, the sooner you will receive yours. The SVQ100 is shipped in a foam lined hard case. 



OBJECTIVE:  100 mm clear aperture, 580 mm focal length (f-5.80), air spaced four element apochromat using an Ohara FPL53 second element. Optimized for full frame imaging.

TUBE ASSEMBLY:  Lightweight, fully baffled,aluminum tube and dewshield. Painted ultra flat black inside. 4.5” diameter main tube.

DIMENSIONS:  OTA: 19.1/4” long with dewshield retracted and 23 3/4” long with dewshield extended (focuser racked in).

WEIGHT:  OTA: Only 10.8 pounds. Rings add 12 ounces each.

DEWSHIELD:  Textured Instrument White aluminum retracting dewshield with cap. Dew shield front ring diameter is 5 1/2” in diameter.

FOCUSER:  3” Stellarvue focuser with 2" of travel, threaded for direct connection of camera using various adapters. Focuser comes with 2 threaded extension tubes with M69X1 thread, 48 mm and 42 mm T ring adapters. Optional upgrade to a custom Feather Touch 3" focuser available. The Feather Touch version of this telescope is $3800. 

RINGS:  Aluminum hinged rings with the standard 1/4-20 thread Stellarvue hole pattern top and bottom. Holes are spaced 1.5” and 60 mm apart respectively, with one in the center.

FINDER:  Optional

PLATE/RAIL:  Optional

CASE:  Comes with foam lined hard case

DIAGONAL:  Optional

FIELD OF VIEW:  Full Frame Camera (Canon 5D, Sbig 11K, etc): 3.56 degrees by 2.37 degrees.  APS sized chip: (Apogee 8300, QSI 583 & 683): 1.92” X 1.34 degrees.

RESOLUTION:  Full Frame chip - 2.28”/Pixel.  APS Chip - 1.92”/Pixel

BACKFOCUS:  153 mm focuser racked all the way in. Focuser’s drawtube attachment thread is a female M78 X 1 thread. The following additional parts are provided for use with various cameras and configurations:

M78 - M69 Adapter

Two 33 mm extension tubes (M69X1 threads)

One M69 to M48 adapter

One 30 mm extension tube (M48X.75 thread)

One M48 to M42 adapter

These various included adapters will accomodate a wide range of backfocus that range from 150 mm to as little as 46 mm (for telescopes that use a standard T thread) and 54 mm for telescopes that use an M48 thread. The modular nature of this equipment enables the user to purchase additional M48 extension tubes if you have a shorter backfocus on your camera. Adapters with other common thread sizes are available from us depending on individual requirements. For example, we have both the 2.156-24 and 3-24 adapters in stock that mate with the included M69 extension tubes. For more specific information on your particular camera, call us and we can let you know exactly what combination will work best with your particular camera. Remember, this is not a backfocus issue that requires precise spacing, the SVQ100 does not need a field flattener. Rather, this is a range in which your camera will focus. Adding or subtracting extension tubes will change where the image comes to focus. It is best to try and hot focus in the center of the focuser's drawtube travel range.  

FIELD FLATTENER:  Not required. Telescope has been tested with small medium and full frame cameras and provides a wide, unvignetted, flat field.

LIGHT GAIN:  204x (human eye = 1)

BELOW: Wizard Nebula by Jon Talbot using the SVQ100


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