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10" Dob collimation - is this right??
Hi everyone
I'm another Ben from WA with a collimation question...
I've just upgraded from a SW 114/900 to a 10" dob and have just had a go at collimating it with a combo sight tube and Cheshire eyepiece - see attached pic for end result.
As far as I can tell the secondary mirror is centered and tilted correctly. When I adjust the primary mirror I can line up the primary centre mark and the annulus of the Cheshire however both are off centre from the crosshairs.
Do I need to keep tweaking the primary or adjust the tilt of the secondary or something else altogether?
Ben
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