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Old 28-01-2013, 11:37 AM
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orestis
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Join Date: Jun 2009
Location: southern highlands, Australia
Posts: 679
Achieving focus on a 12'' dob

Hi everyone,

Lately I have gained interest into astrophotography mainly from my recently purchased Canon 550 D.

I have taken some shots on a still tripod and stacked them with some pleasing results although an eq mount would ofcourse be better, though being a student its an expensive realm.

So I bought a t-mount and 2'' adapter. Attached it to the camera and slid it into the focusser only to get a a big blurry image of the moon. I tried focusing outwards and the image became more blurry. Focused inwards and the tube would not go any further in.

I have heard that, moving the mirror up would solve this problem. though I really don't want to be hacking away at the tube.

So if there is any other means of being able to achieve focus,please let me know.

thanks in advance, Orestis
PS- would a 1.25 '' adapter cause vignetting , because I have a small 5'' reflector I could try it on.
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