Hi,
I don't have access to my copy of Strobel at the moment and I need to determine the point, between infinity and 1:1, at which two of my lenses, one of which covers 4x5 at infinity and one of which covers 5x7, will cover 8x10.
Does anyone know the formula to determine this, either in terms of magnification or length of bellows extension or both?
Thanks.
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