Quote:
Originally Posted by Satchmo
...You might want to go with the 3.5" diagonal and allow yourself a little more freedom in dimensions. It certainly won't make any perceivable difference at the eyepiece...
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Thanks Mark, I remember you said in passing comment that a 3.1" should be okay. I was going to get back to you on that. Good to see both my poor maths skills and poor knowledge of optics have not let me down this time around!!