09-04-2010, 04:39 PM
Just another thing:
The photograph with the ghosting was a shot with the 50 F/1.4. There are similar shots in th egallery with high contrasts, at low EVs, taken with other lenses. As far as I can see, there are no such reflections in those images. So, until we see more proof of this to be caused by the mirror, it could also well be caused by internal reflections in this lens, or by a filter mounted to that lens.
Also, the DR of the A55 is 9 EV apparently. This would indicate, based on the calculations above, that ghosting caused by reflections would be at a level non-perceivable by the sensor (unless this is a black dot type problem, caused by the processing of the image).
I would really like to know now whether the back of the mirror has the mirror coating, or the front. Anybody knows for sure?
Kind regards, Wim
The photograph with the ghosting was a shot with the 50 F/1.4. There are similar shots in th egallery with high contrasts, at low EVs, taken with other lenses. As far as I can see, there are no such reflections in those images. So, until we see more proof of this to be caused by the mirror, it could also well be caused by internal reflections in this lens, or by a filter mounted to that lens.
Also, the DR of the A55 is 9 EV apparently. This would indicate, based on the calculations above, that ghosting caused by reflections would be at a level non-perceivable by the sensor (unless this is a black dot type problem, caused by the processing of the image).
I would really like to know now whether the back of the mirror has the mirror coating, or the front. Anybody knows for sure?
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....