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Post by themystif on Nov 2, 2006 12:18:10 GMT
Hello again all. Sorry to be a pain, but does anyone have any experience of collimating a refractor? the Skywatcher Evostar120 that I have decided on comes with an adjustable objective lens. I am curious to know if it is as hard/difficult to collimate as a reflector. I would be keen to get out next Friday, and even keener to get this scope and get cracking!! P.S. has anyone any dealings with Pulsar Optical at all?? Dark, clear skies all.
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Post by NeilP on Nov 2, 2006 13:00:41 GMT
Hi one of the benefits of a refractor is that is should virtually never need collimatiing unless it has had some really rough treatment. That said there is a really good post on the forums section of www.cloudynights.com on how to collimate a refractor, it is in the stickies on the refractor section. I have only dealt with Pulsar Optical once, they were reliable enough just it was better to phone because I never got replies to my emails. Clear Skies Neil
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Post by markdj on Nov 2, 2006 19:23:40 GMT
I would check the collimation first as refectors don'tgo out very easily then see if it needs adjusted. If you have a 35mm film canister then put a small 1mm hole in the centre of the base. Shine a light into the scope and look into the film canister which should fit into the scope. You will see an out of focus image and hopefully a ring of light like a doughnut. Make sure it is perfectly spherical and if not then that is when you need to adjust the lens cell.
I can help you with this at the meeting on Monday if you wish.
Mark
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Post by themystif on Nov 2, 2006 21:35:50 GMT
Many thanks Neil and Mark. Hopefully I should be able to get to the meeting - on-call allowing and would be very grateful Mark for any assistance. ;D Dark skies Brendan
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