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Thiink. I use a 'clear' film cannister . I leave half protruding from the focusser .The scope I place under the light and aim it at the ceiling near the light, not at it. The light shining on the cannister gives you better contrast on the hole and the white ceiling gives a nice background. Check your collimation at vertical, horizontal and at 45 degs. Take note of any change.
ps : To check how central your hole is,rotate the canister after coll. and see if the hole stays central or if it has an orbit.
Slice
Last edited by slice of heaven; 25-03-2005 at 01:35 PM.
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