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Sorry in advance for a question that will show off my ignorance, but I appreciate any input you all can give. I have a project that requires me to take macro pictures of some very small electrical components. I have a 5dII body and a full set of Kenko extension tubes (36mm, 20mm, and 12mm). My question is, which of my lenses in combination with which tubes is going to give me maximum usable magnification? The target components are going to be on a test bench, and focal plane depth is not a major consideration.
A web search yielded the equation "Additional Magnification = (Extension Tube Length)/(Lens Focal Length)" My available lenses are:
20-35 f/2.8L
28-75 f/2.8 (tamron)
24-105 f/4L IS
50 f/1.4
85 f/1.8
90 ts f/2.8
135 f/2.0L
70-200 f/2.8L IS I
70-300 f/4L
Is it as simple as the 20-35 at 20mm paired with the three tubes together (68mm) is going to have max magnification (68/20 = 3.4x magnification)? Or is there more to it than that?
Thanks in advance for any thoughts; no answer is too basic as I've only ever messed around with macro stuff on a whim. The only lens I've used so far is the 90 ts, because it is manual focus and seems to give the finest manual adjustments.
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