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    maxshuty's Avatar
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    Default Why won't it focus?



    All I am able to get when I try to focus on a star or planet is something that looks like this at the beginning of the video: Telescope Colimation Check on star - YouTube

    When I zoom all the way out it gets about 50% smaller but that's it, it still had the big black dot in the middle and won't zoom out any further. I have an etx 90. Any help?! I tried using my 26mm and 9.7mm lenses...

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    Default Re: Why won't it focus?

    I am not familiar with the ETX90, but it sounds like you need an eyepiece extender. Have you tried sliding the eyepiece out of the focuser a little to see if it achieves focus or at least continues to improve. I would not expect this to be necessary, but the symptoms you describe sound like you need to move the eyepiece farther back.

    Is this a new scope? Are you using a diagonal? If not, that may be the problem

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    maxshuty's Avatar
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    Default Re: Why won't it focus?

    Ill try my 45* extenders. I'm really hoping I can figure this out by tonight since Saturn will be at its closest tonight

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    Default Re: Why won't it focus?

    Don‘t worry about Saturn. Visually, it will look exactly the same for many, many days!

    Are you placing the eyepiece directly into the 1.25" opening (at 90 degrees to the scope's main tube)?
    My ETX-90 will focus over an extremely wide range. The focuser should rotate dozens of turns without forcing it. Try turning it all the way to its stop, then watch in the eyepiece as you slowly focus all the way back until focus is reached. Go slowly, it's easy to miss focus.

    Chris

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