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Showing results for tags 'collimation 200p'.
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Hi ... I've been away from astronomy (and Stargazers Lounge) for a couple of years for various reasons. I'm back now and have a problem with a Sky-Watcher 200p reflector on an EQ5 that I have acquired 2nd hand. And the problem is ... yes, collimation. The issue is, I think, with the secondary mirror. It seems to be misaligned because I can't seem to get anything on the scope collimated (I never was an expert collimator). Please see the attached image: following Astro Baby's advice I put (pink) coloured card in front of the primary mirror to highlight the position of the secondary. Looking down the focusing tube the secondary (pink circle) seems to be way off centre and appears to be nearly touching the outline of the focusing tube on the right-handed side. The shape of the secondary in the image seems to be pretty circular ... but it seems to be in the wrong position. I have tried adjusting the secondary's locking screw but that didn't change its off-centre position. I have also fiddled with the tiny Allen bolt adjustors ... but I don't want to fiddle anymore! So, any advice on how I can centralise the secondary as viewed through the focusing tube? Many thanks, Julian