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Celestron CGEM II 8 SCT

The CGEM II is Celestron's mid-range computerised equatorial mount paired with their proven 8-inch SCT optical tube. The CGEM II mount is a significant step up from the NexStar SE's alt-az platform — it is a proper German equatorial mount rated to 18kg payload, capable of unguided astrophotography exposures and serious visual observing sessions lasting hours. The 8-inch SCT gives you 2032mm of focal length in a tube that is less than half a metre long. Planets at 250× are detailed and stable; deep-sky objects through a reducer look photogenic and rich. This is the configuration that dedicated amateur astronomers graduate to after outgrowing their first setup.

203mm aperture2032mm focal lengthf/10Schmidt-CassegrainGoTo (Computerised)GoToAdvanced

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What you'll see

These forum discussions do not contain owner reports of what is actually visible through the Celestron CGEM II 8 telescope. The threads are dominated by technical discussions about mount compatibility, tracking accuracy, and astrophotography performance metrics (periodic error, guiding, imaging quality). While one thread mentions an AP 130 EDFS refractor being used on a CGEM mount where it 'acts like it was made for it' and provides 'stable' views, there are no specific descriptions of celestial objects, planetary detail, deep-sky targets, or visual observing experiences unique to or characteristic of the CGEM II 8 itself. The forum conversations focus almost entirely on mechanical and electronic performance rather than the visual experience of observing through the telescope.

Worth knowing before you buy

Mount head feels heavy and unbalanced when used with the CGEM II despite the scope being stable; dovetail and rings must…

CGEM II has poor native periodic error of 15-30 arcseconds peak-to-peak, which is 3-6 times worse than competing mounts…

CGEM II has low declination guiding performance with slow correction when declination reverses, taking more than 5-10 se…

Full Specifications

Optics

Aperture203mm
Focal Length2032mm
Focal Ratiof/10
Optical DesignSchmidt-Cassegrain
CoatingsStarBright XLT multi-layer coatings

Mount & Tracking

Mount TypeGoTo (Computerised)
GoTo (Computerised)Yes
TrackingYes

Focuser

Focuser Size2"
Focuser TypeSCT rear-cell focuser with reducer thread

Physical

OTA Weight5.4kg
Total Weight (with mount)34kg
Tube Length432mm
Tube MaterialAluminium

Included Accessories

Eyepieces40mm eyepiece
Finder Scope8x50 right-angle finder scope
DiagonalYes

Smart Telescope Features

Built-in CameraNo
App ControlledYes
WiFiNo
Battery IncludedNo