It was present on a DCS200 that another department possessed, then we got a Canon EOS DCS-3. No problems there until around 5000 shots had been taken on the cameras, then the spot started to appear. We've now been using DCS520s for a while and, surprise, surprise, there it is again. Very faint most of the time, but clearer on some shots than others. Most of our clinical work is done under fairly contrasty lighting at apertures around f/11 to f/22. As the aperture opens, so the spot becomes larger and less distinct.
Recently got the EOS 1Ds which is being used for general, location work, not clinical material, so we haven't seen anything similar on this yet.
I would love to know the definitive reason for this phenomenon and if there's any way of avoiding it...
Simon
At 12:43 12/09/2003 +0100, Mark Harwood wrote:
I just picked up this e-mail regarding the 'orange spot' on the DCS14N. Our very first commercial shoot with this camera was a portrait shoot with the Nikon 85mm f1.8 We saw a reddish spot in the centre of the image on every file, thought it looked like lens flare so checked the lens, flagged off all lights and even built a black screen in front of the lens, nothing helped. We've been using this lens for many years on film with no such issues. We then changed to the 105 Micro, no problems at all. We sent a file to the experts at Kodak who claimed that we were seeing lens flare, but we thought not.
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Simon E. Brown MSc FIMI FBIPP FBPA
Director, Media Resources, UCL (University College London)
The Windeyer Building, Cleveland Street, London W1T 4JF
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Mobile 07802 868531 URL: http://www.ucl.ac.uk/mediares
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