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#11
September 8th 04, 09:34 PM
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Peter Werner wrote
I'm not sure what you mean by 'full-time manual focusing' - please define. The focusing ring works in both AF and MF modes. This means that you can use AF to get an approximate focus, then fine-tune the focus manually without having to switch anything. Canon's USM lenses do it, but the Tamron 90mm macro lens doesn't: it has a clutch mechanism, so you slide the focusing ring forward or back to switch between AF and MF. This is probably better than having to use a separate switch, but still isn't as convenient as full-time manual focusing. In the AF position the focusing ring just spins. -- Hil 
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#12
September 8th 04, 09:34 PM
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Peter Werner wrote
I'm not sure what you mean by 'full-time manual focusing' - please define. The focusing ring works in both AF and MF modes. This means that you can use AF to get an approximate focus, then fine-tune the focus manually without having to switch anything. Canon's USM lenses do it, but the Tamron 90mm macro lens doesn't: it has a clutch mechanism, so you slide the focusing ring forward or back to switch between AF and MF. This is probably better than having to use a separate switch, but still isn't as convenient as full-time manual focusing. In the AF position the focusing ring just spins. -- Hil
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