The Celestron C9.25 optical tube optical tube weighs 20 lb; the Sky-Watcher AZ-GTi is rated for 11 lb. Whether the tube fits the mount payload, and the margin once you add a diagonal and eyepiece.

Updated 05 September 2026.

Eyepiece and telescope pairing

Will the Celestron C9.25 optical tube fit on the Sky-Watcher AZ-GTi?

Whether the Sky-Watcher AZ-GTi can carry the Celestron C9.25 optical tube tube steadily, from the published tube weight and mount payload.

Optical tube weight
20 lb
Mount rated payload
11 lb (a compact WiFi GoTo altazimuth mount rated for a light instrument payload)
Tube as share of payload
182%
Dovetail
Vixen-style, matching this mount head
No fit

Over payload. The Celestron C9.25 optical tube tube weighs 20 lb, more than the Sky-Watcher AZ-GTi rated payload of 11 lb, so the mount is overloaded and views will shake. Choose a heavier mount.

A mount's rated payload is for the whole instrument, not just the bare tube. The Celestron C9.25 optical tube tube is 20 lb, which is 182% of the Sky-Watcher AZ-GTi 11 lb rating before you add a star diagonal, finder and eyepiece.

For steady high-magnification views many observers keep the real load below about 70% of the rated payload, because damping time grows quickly as a mount nears its limit. A compact wifi goto altazimuth mount rated for a light instrument payload.

The mount to buy

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Related

Celestron C9.25 optical tube235 mm f/10
Celestron C9.25 optical tube to camera adapterprime-focus thread
Best eyepiece for the Celestron C9.25 optical tubeexit-pupil match

Questions and answers

Will the Celestron C9.25 optical tube fit on the Sky-Watcher AZ-GTi?

Over payload. The Celestron C9.25 optical tube tube weighs 20 lb, more than the Sky-Watcher AZ-GTi rated payload of 11 lb, so the mount is overloaded and views will shake. Choose a heavier mount.