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Bellows extension

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Thread starter Terry Bowyer
Start date Nov 2, 2008

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Kilgallb

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Jan 29, 2024

#126

Alan Edward Klein said:
My cellphone has an app that shows a calibrated ruler on the screen. I suppose one could use that in a pinch.

If you have a phone you have a calculator so use the formula d^2/f^2

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