Given lighting is not a problem, can you hit a limit where you have too much extension tubes (a very long tube) and the quality of the image will suffer? For example a diffraction limit will be hit for the adjusted F-Stop or something like that?
What are the variables that come into play here.
Answer
Yes, if I put 68 mm of tube (36+20+12) behind my 12-24 lens, I can't focus on a subject because the focus point is behind the front lens.
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