I am about to purchase this lens for macro work both in the field and in studio. When I do a 1:1 I undestand that the subject will be 50mm in front of the lens and the bellow extension will be 100mm. My question is that what if I do a 2:1 (image 2x), the below extention will be 150mm but how much distance between the front of the lens and the subject? 50mm? 25mm?
I am planning to do up to 8:1 (8x) magnification so the bellow extention will be 450mm but how much will be the distance between the front of the lens and the subject.
I also need help on the exposure compensations
thanks in advanced.
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