I am not really the person to comment on this thread in any great depth, but felt I should make at least one observation of my own which may or may not be relevant.
In the analogue days of film a lens may well have been classified as apochromatic, but unless I am much mistaken, the description would have been based upon setting these lenses geometry to focus on colour film (probably Kodachrome or Ektachrome). The true apochromaticity (my extrapolation!) would thus surely have taken into account the different depths of the coloured layers in such film when deciding upon the focus.
A modern chip be it CCD or CMOS is essentially one layer deep in terms of where it is focussed, which presumably accounts for why manufacturers have recomputed lenses for digital capture, and from all the evidence I have seen, the use of earlier lenses computed for film cameras have not performed to the standard we had experienced when used to expose digitally, whereas the 'digital' lenses despite their necessary lesser overall coverage have been extremely good.
So for a change this is not marketing hype and an opportunity to sell us new kit, but a genuine response to changed circumstances.
In short, I do not see you avoiding chromatic aberration in using a C-mount lens from a bygone era, however good it was for film.
Rod
PS. I am in no way qualified to make the above assumptions, so it is no more than an interjection.
On 17 May 2004, at 11:22, Tony Riley wrote:
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)
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