On Date: Mon, 17 May 2004 Martin Wood wrote: > Subject: Re: [PRODIG] Purple fringing comparisons between cameras. > > Purple fringing - do not knock the camera until you have changed or > investigated lenses. As I have said on a few occasions, this effect is due > to Chromatic Abberations in the lens. > Another analogy ( but perhaps a little esoteric) using Technical pan film > and complaining that it is shows stuff Plus -X doesn't such as a defined > depth of field, or it is not as sharp as it is meant to be. > Its all down to the lens! - Really.
Short anecdote to confirm. Does anyone remember George Wakefield - he taught me photog. theory at Manchester Poly in the late 60's? I always remember his demo of how a yellow filter for b/w increased the sharpness of cheap lenses by cutting out chromatic aberration. Of course the colour of the fringing isn't really there - only produced in our brain ;-) On a different slant of this topic, I've been searching without success for a digital camera with no filtration, with a C mount lens fitting so I can use my apochromatic lenses (to reduce chromatic aberration). Mainly been searching scientific camera suppliers. Can anyone with specialist knowledge help? Thanks. Tony Riley (Kendal) www.photosightdesign.co.uk www.sharpedgegallery.co.uk =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
