Quote:
Originally Posted by Screwdriverone
Hi Eric,
Thanks, i think this could be the best (and safest for my scope) option.
Hi Programmer,
Yeah, I have tried all that, the cheshire is pretty much OK anywhere in the tube, I dont have any problems seeing the difference between the reflections of the primary and the secondary / outside of the cheshire reflection.
The focuser has a bit of slop in it as it is R&P but I did test the collimation on Regulus, Betelgeuse, Sirius and a few others and found that I didnt have concentric round circles either side of focus but a squashed looking halo of the star that reminded me of a smoke ring in a very slight breeze. It was crooked and bent like a froot loop that has gone soggy on one side. (sorry, all I could think of)
I certainly didnt get a nice round image off focus like all the guides show you.
Chris
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Erick's is sound advice. I guess I'm just asking to help with my own feeble collimation attempts (which I *think* I have got down pat).
Just to clarify.. the star collimation test you did is the one to check collimation, not the optics (i.e. the 'airy disc') test?
But, I guess you'd know if your collimation was out or not. As I said, I'm just curious.