>I've always thought of this as a classic example of pointless
>automation. On the older series of prime lenses the optimal aperture
>was marked in a different colour from the others. In conjunction with
>the depth-of-field scale on the lens this did everything that the MTF
>programme does, and all it requires is paint and a fine brush. A nice 
>simple
>solution.

I think you misunderstood the purpose those "red" indicators (and I don't 
mean the infra-red index). On some old Pentax prime lenses, just match the 
red colour aperture and focus setting, and you can just shoot without 
further focus. It's more or less like a focus free P&S camera.

regards,
Alan Chan


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