I want to buy an extension tube for my Pentax 645D that will allow me to fill the sensor as best as possible with a 35mm negative. I have 2 lenses I could use, the 75 2,8 or the 55 2,8.
I donīt know how to calculate the magnifications required so I donīt know which one to buy. There is a 13.3 mm and a 26.6mm one. Or should I buy both and couple them together?
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