How is my collimation?

[batema]

Hi,

I have realised the potential of my C8 for planetary imaging. It is 12 years old and has at on stage fallen about 1m to the ground without breaking anything. I am asking about my collimation as I have attached a screen shot of a defocussed star and I think I can already see it may be out but is it bad or could I gewt away with it???

Mark

[erick]

Mark, can you defocus just a little, until you can see rings, and photograph again. I think that photo has too much defocus.

[batema]

I'll have a crack at that tomorrow night eric as my gear is packed up.

Mark

[RickS]

Your collimation looks pretty good to me using Al's Collimation Aid, a tool I only learned about yesterday. Download the v1.1 from here: http://www.iceinspace.com.au/forum/showthread.php?t=62696

Cheers,
Rick.

[DavidTrap]

At first glance, I thought it looked fine, but I can see more rings on the right side vs the left, suggesting you're a bit off.

DT

[DavidU]

Looks good but a tiny bit off at 9.00.

[DavidLJ]

Looks like your collimation might be a little bit off. See attached image in which the silhouette of the secondary mirror is not exactly concentric with the rim of the primary mirror as indicated by their respective coloured circles. If you want to check this out yourself you can get a free download the little application that I used from
http://www.megaupload.com/?d=7QKTRZAJ.

[allan gould]

From your PDF it appears collimation is off just a bit using Als collimation guide. I use this to tweak the last bit out of my scopes and the rotatable numbers on the outer rim really aid in determining which screw to tighten or to loosen. Very easy to use