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    TonyBegg's Avatar
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    Default eye relief and spectacles



    Just got my first scope (ES 127 APO CF) and CG5GT mount to come Monday. Have an ES 82 degree 30mm (2 inch) and a Televue 60 degree Radian 4mm (1.25 inch) to arrive later next week. Got a 20% off ES coupon so planning to get a medium power eyepiece to bridge the magnification gap. First two eyepieces have 21 mm and 20 mm eye relief. I am strongly myopic and have astigmatism (well, Beethoven was deaf, right) and do not think I will be able to keep putting specs on/off and stay relaxed. So specs on, and I would get a prescription without bifocal just for astronomy, if necessary. The mid power ES have eye relief of 14 mm or 15 mm. My specs have a negative power - will this mitigate eye relief i.e. push the focus out a bit more towards my eye? I have Googled for this but no luck.

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    Joe Lalumia's Avatar
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    You need from 15mm-20mm eye relief to be able to see the entire field of view with your glasses on --- which they will need to be on.

    Something like 19mm or 20mm is probably what you will need.

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  3. The Following User Says Thank You to Joe Lalumia For This Useful Post:

    TonyBegg (02-19-2012)

 

 

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