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Just had a play with my 350D and Sigma 18-200. It certainly gives the red light if it thinks you have focussed correctly manually at longer focal lengths, but as you near the 18mm end it is reluctant, possibly as I was aiming at the screen and it did not find it as easy to get "edges" to lock on to. I do miss the split and frenzel screens to focus as on my A1. I find at the 18mm setting and a wide depth of field, it not easy to focus manually on anything close on the 350D screen anyway. Blame the bifoculs!
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Rollei TLR, Canon A1, Canon EOS 300, - Canon 350D + Sigma 18-200 Sigma 70-300 Sigma 2.8 70-200DG and Canon 50mm 1.8
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