Quote:
Originally Posted by ballaratdragons
Sounds like you may have forgotten to add in an extension tube.
Did you ever use one?
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Never needed one for direct imaging before Ken. I do need to add one if I want to do visual observation. All solved now though (I think) - see below
Quote:
Originally Posted by tlgerdes
Been here, done that.
Loosen your drawtube lock screw off another 2 turns, it is catching on the drawtube. It reduces the drawtube travel by about 7mm.
This is a known issue with the GSO focuser and caught me in my first week.
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Thank you for your thoughts Trevor, but I had already tried that. It was certainly not catching on anything. I think I just found the reason after calming down and having a think about it more. When I collimated the scope I must have pushed the primary mirror further up the tube than where it normally rests. I seated the whole primary right back down to the bottom of the tube, recollimated and bingo- the focal plane is now back to where it was. Phew! Thanks again guys.
Cheers
Greg