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SharpStar 121SDQ 121mm f/5.6 Quintuplet Apochromatic Refractor Telescope

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in In stock (2)
5.20 kg
Aperture (mm) 100 Focal Length (mm) 580 Focal Ratio f/ 5.8 Optical Design Apochromatic Refractor
Mount Type Mount Movement
Our price:

including VAT 20.00 % ( £543.00 )



SharpStar 121SDQ 121mm f/5.6 Quintuplet Apochromatic Refractor Telescope - Flatfield Astrograph - with Enormous Illuminated Field (60mm) for Sensors up to Medium Size

The serious amateur's astro photo instrument with nearly portable weight and size, a fast APO with incredible colour correction, for mainly astro photography!


SharpStar 121SDQ telescope features:

• 121mm f/5.6 four-element full separation (air spaced) optical design
• five-elements in two groups (a triplet at the front and a double corrector/flattener at the back)
• multi-layer coating

• Includes one Ultra-Low Dispersion ED lens element in the triplet part
• Flatfield performance (no need for field flattener due to the optical design...)
• 4" dual-speed rack and pinion focuser, 10:1 fine focus
• 2" and 1.25" universal interfaces
• Angle adjuster for 360 degree rotation
• Universal (Vixen-style) dovetail bar with tube rings
• Comes with a finderscope shoe

• Hard case included

The SharpStar 121SDQ ED APO is a good news for serious astro photo enthusiasts. It's a great instrument for a great price!
The SharpStar (Ruixing) 121SDQ ED APO apochromatic refracting telescope features a five-element in two groups design that includes one Japanese FPL-53ED lens and a full-surface multi-layer coating. The five-element optical design makes the SharpStar 121SDQ an excellent imaging instrument. The surprisingly large image circle of 60mm makes the 121SDQ a good match to any full-frame dSLR, CCD or CMOS camera, even with a medium sized sensor (!) giving you unparalleled shooting quality. The use of super low dispersion ED glass (FPL-53) offers excellent colour abberration control, not only reflected in high quality imaging, but also takes observation with the 121SDQ into a new realm. Whether it is sharpness, contrast, or chromatic aberration control, it has a very good performance.
It provides a very good observation and shooting system thanks to the fast focal ratio and a generous back focus (145mm). The unique five-piece design incorporates special ED APO lens for excellent chromatic aberration control, sharp stars and overall sharper images.
The SharpStar 121SDQ ED APO also offers an impressive focusing system while providing an excellent optical system. The SharpStar 100Q ED APO has a two-speed 4-inch rack and pinion focuser with 1:10 aspect ratio. Compared with many refractors on the market, the use of a rack and pinion focuser offers larger payload and a stronger hold, so that your focuser will not slip when using heavy-duty observation accessories or camera. Worried about being out of focus or badly framed image? The 360-degree rotator allows you to easily rotate the shooting angle and correct the framing to your own satisfaction. The 4-inch focuser's 2" international standard interface with brass compression ring does not let your accessories to scratch. More importantly, its 4-inch focusing tube is more robust and more stable than most commercially available 3 or 4-inch focusing tubes. It also provides good upgrades for heavy-duty accessories such as a filter wheel and OAG. 
In addition, the newly improved load-bearing adjustment screw on the body of the focuser lets you to adjust your focuser according to the weight of the attachment.
The SharpStar 100Q ED APO is a reasonably priced observational and imaging tool with fast-focal ratio five-element optical system that features exotic FPL-53 super ED glass, high quality heavy duty 4-inch rack and pinion focuser. When compared to other similar products on the market, its value is self-evident.

Product parameters:
Model: Ruixing (SharpStar) 121SDQ
Objective type: 5-piece fully separated APO (one of the front two is Japanese FPL-53ED glass)
Effective aperture: 121mm
Focal length: 678mm
Focus ratio: f/5.6
Fully illuminated image circle: 60mm
Resolution: 0.97 arc seconds
Visual limit: 12.1 magnitude
Accessories included: a pair of tube rings and dovetail bar
Main tube outer diameter: 130mm (tube ring size)
Net weight: 7.98kg (excluding tube rings, dovetail plate and handle)
Gross weight: 8.92kg (including tube rings, dovetail plate and handle)
698mm (with extended lens shade) 598mm (with closed down lens shade)
Click on the above image for full resolution...Taken by a Sharpstar 121SDQ. 8 x 5min each channel (HSO) + 2 x 5min Luminance
Click on the above image for full resolution...Taken by a Sharpstar 121SDQ. 10 x 5min each channel (HSO) + 6 x 5min Luminance

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