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Polar Alignment - how close?


iapa

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I've always wondered how far 'off' PA can be before significant image distortion appears.

e.g. for60s subs, is 30arc-min reasonable, or does one need better.

I did have a formula for working that out but never really been in a position where I was that well set up to take this into account

Anyway, I've lost the reference now I need it  :(

 

 

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