01-23-2012, 02:34 PM
[quote name='photonius' timestamp='1327148526' post='15088']
I would expect that shift is simply left within design tolerances. I.e. I mean a lens is circular, so everything is theoretically centered. Likewise, lens mount and sensor are mounted in the place where they are calculated to be. So, I don't think much is adjusted here. Based on hard vignetting testing, indeed corners are not exactly the same for different lenses. http://photonius.wikispaces.com/Vignetting
[/quote]
Yes, theoretically everything is centered. But I wonder how large is the error in the match between the center of the lens mount on the lens and the center of the lens mount on the camera. For example, for the Nikon DSLR, many lenses shake a little bit after they are mounted as many people have claimed. This kind of shake would cause a shift of the lens center from the sensor center, but I have no idea how large the shift could be, 0.01mm, 0.1mm, or 0.2mm?
Regards
Frank
I would expect that shift is simply left within design tolerances. I.e. I mean a lens is circular, so everything is theoretically centered. Likewise, lens mount and sensor are mounted in the place where they are calculated to be. So, I don't think much is adjusted here. Based on hard vignetting testing, indeed corners are not exactly the same for different lenses. http://photonius.wikispaces.com/Vignetting
[/quote]
Yes, theoretically everything is centered. But I wonder how large is the error in the match between the center of the lens mount on the lens and the center of the lens mount on the camera. For example, for the Nikon DSLR, many lenses shake a little bit after they are mounted as many people have claimed. This kind of shake would cause a shift of the lens center from the sensor center, but I have no idea how large the shift could be, 0.01mm, 0.1mm, or 0.2mm?
Regards
Frank