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Calculating eye relief when using a barlow


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Does anybody know of a formula to estimate the eye relief when a barlow is being used?

I know the eye relief gets longer, and by how much will depend on the strength of the barlow, the focal length of the eyepiece and of course the original eye relief value.

Also, I would guess that the design of the eyepiece may affect the final value, so I'm only really interested in getting a reasonable estimation of what the final value would be.

Thanks in advance,

- Andrew

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