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- Rob
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Ok this is a subject that's making my brain hurt a tad, I'm not a big maths person so go easy.
I'm planning on sticking a set of 3 extension tubes on my 70-200 2.8 and having a play, I'm wondering how I figure out;
1. the minimum focus distance.
2. what effective magnification I will be getting.
If I said at 200mm with 12-20-36 tubes on, giving 68mm of extension - can someone give me a run down of what equations I should be running through?
I would appreciate it
I'm planning on sticking a set of 3 extension tubes on my 70-200 2.8 and having a play, I'm wondering how I figure out;
1. the minimum focus distance.
2. what effective magnification I will be getting.
If I said at 200mm with 12-20-36 tubes on, giving 68mm of extension - can someone give me a run down of what equations I should be running through?
I would appreciate it