On 05/07/2007 gary wrote: > Seems to me the camera should be able to compensate for the > vignetting. > It "knows" the lens and the sensor, so it should know the light > falloff.
There are software strategies for dealing with both vignetting and chromatic aberratuon artifacts, also barrel/pincushion distortion and just about any other drawing issues that lenses get wrong onto a flat surface, but processing power so far means they're post-prod techniques done on the computer rather than in cameras. The Leica M8 Kodak sensor uses microlenses that are progressively angled toward the lens axis to increase light-gathering power near the edge of the frame. Vignetting still occurs with short lenses at wide apertures, but given the short back focus of the lenses involved, presumably it'd be worse without. Then you have Olympus producing telecentric-ish lenses so off-axis rays are perpendicular(-ish). If all else fails I still have the Kodak Brownie 620 I was given as a kid, a tin box with a 2 element lens stuck in the front. That wasn't perfect either, but I can't say it mattered :) -- Regards Tony Sleep http://tonysleep.co.uk ---------------------------------------------------------------------------------------- Unsubscribe by mail to [EMAIL PROTECTED], with 'unsubscribe filmscanners' or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or body
