Paul asks…How to know if my lens have focus problems?How do you check for backfocus and front focus problems on a lens? I think my lens have it and I would like to learn how to know for sure it has the problem or not. Oh my lens is a Canon mount Sigma 18-50mm f/2.8-4.5 DC OS HSM. not an expensive lens. and quite soft toomr.eos answers:This pdf has all you need including a printable test chart for free.
Http://focustestchart.com/focus21.pdf
There is a more accurate way if your camera has
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