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Concenter collimation tool


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Hi all after reading that a Concenter tool is better than a Cheshire for collimation  I want to get one but do I get the 1.25 to match the size of eyepieces I am using or go for the 2 inch to match the focuser ? 

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be careful if you have presbyopia- i bought the regular 2” one and can’t get the rings in focus so it’s pretty useless. I use my asi120 with its wide angle lens and “mire de collimation” free app to align. There’s a longer version of the concentre though which should make it easier 

Mark

 

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Sorry for confusing you Neil- in a nutshell if you need reading glasses you may not be able to focus on the regular concentre rings (I can’t) and should look at the longer version- which looks like only available in 2”- called Visus

Mark

Edited by markse68
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