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Old 25-08-2014, 09:26 PM
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1kmodem (Will)
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Join Date: Aug 2014
Location: Melbourne
Posts: 32
8" Dob - Focuser broken or normal?

I bought a 2nd hand 8" bintel dob and new to telescopes so I am not sure whether the focuser is broken or this is how they work...

When the scope is upright the focuser knobs move the EP part in and out like a camera focuser, but when viewing on say a 45 degree angle it just falls in and I have to manually pull it out to where I want it, then lock them in with the 2 screws.

I've tried tightening 1 screw and turning the focuser but its locked.

Here are some pictures of my scope inside and outside.
pic #1 - inside the scope
pic #2 -1. is the focuser knobs 2. is the locking knobs
pic #3 same as #2 without flash

Any help is much appreciated.

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