Question about Celestron NexStar 11 GPS (660 x 279mm) Telescope

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Focusing Issue Last night, I used my Celestron 11" NexStar11GPS for observing and astrophotography, and it worked like a charm. Tonight, with the same equipment, I am unable to focus the telescope at all. I turned both the coarse and fine focus knobs counterclockwise as far as they will go, but every object is still out of focus--and once I reach a certain point in turning the focus knobs, the object simply moves in the eyepiece rather than becoming more focused. This problem is present with or without the use of a diagonal. The only thing I did with the telescope between last night and tonight was to mount a Celestron StarPointer (a holographic sight-type finderscope) onto the side of the telescope tube's back end with some 8x32 3/8" screws using pre-drilled screw holes. What happened?

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  • coderedd Jun 27, 2008

    Yeah.. I inspected the primary for any visible damage yesterday and found that it was bumping into the tips of the screws. Shorter screws fixed it! Thanks anyway.

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The screws should be short enough not to stop the primary's travel, but pull them out and try it again. Good luck! George.

Posted on Jun 27, 2008

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