The ToupTek GS series guide scopes are an upgrade of the previous FS generation of finder/guide scopes. They are affordable, high-quality instruments that deliver a flat field with low chromatic aberration. This means the stars will be sharp and clear across the entire field, meaning the autoguide software will easily find good guiding stars.
The ToupTek GS-150AR has a 30mm aperture and 150mm focal length. Unlike many guide scopes, this comes with a single-speed rack and pinion focuser.
The GS Series guide scopes employ a proprietary 1-inch flat-field PAPO triplet with an ED low-dispersion element. Chromatic aberration, astigmatism, and field curvature are effectively corrected for crisp, pinpoint star images. One scope covers guiding, visual observing, and entry-level deep-sky imaging.
The image circle on this scope is 1″, meaning appropriate sensors would be smaller than APS-C. Example sensors include Sony IMX174, IMX485, IMX585 or SC2210.
Features
CNC Precision Machining with Fine Matte Finish
The tube, rings, and dovetail are CNC-machined from aluminum alloy for an ideal balance of low weight and rigidity. Anodized surfaces resist wear and corrosion in the field, while the refined matte texture delivers a comfortable, non-slip grip.
Modular Design – Highly Expandable
A dedicated matte-black M48 extension tube forms the core of the OTA. Mix and match modules to suit your required back focus—covering visual observing, guiding, and imaging without compromise.
Rack and Pinion Focuser
The GS-150AR is supplied with a single-speed rack and pinion focuser. The bearing-guided gear drive increases load capacity and precision, and it supports ToupTek AAF or third-party motor focusers for automated focusing.
Broad Compatibility and Flexible Configurations for Seamless Integration Across Systems
GS Series guide scopes are ready for a wide range of accessories. High-transmission coatings and fully baffled interiors preserve contrast, whether you attach cameras, focusers, or diagonals.
1) Supports high-quality imaging with 1-inch and smaller guide or planetary cameras.
2) Focuser drawtube offers a 1.25-inch inner diameter with an external M42×0.75 thread—connect cooled cameras (optimized for a 1-inch image circle) or add motor focusers such as the ToupTek AAF or IFR focus stations.
3) Use third-party bayonet-to-M42 adapters to attach mirrorless or DSLR cameras. Adjust the extension tubes to match the flange distance—APS-C sensors are recommended to minimize vignetting.
4) Modular M48 extension tubes let you swap to shorter tubes when pairing with eyepieces or diagonals.
5) Tube rings include multiple M5 threaded holes on the top and sides to mount additional accessories.
6) The dovetail base provides multiple M6 threaded holes plus a 3/8-16 port for quick attachment to tripods or equatorial mounts.
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