ManWearPants wrote:
Thanks for explaining, However, in the 2 tests above, the L always appear larger and nearer. I am thinking that this is due to the L being longer and offers a slightly different angle of view. If we move the subject slightly backwards to have the same perspective as that of the ZE MP. Would it improve the IQ since the cup being white in colour and being closer to the lens, it will reflect more lights and increases the exposure slightly more and this may causes the colours to be less contrasty?
Actually the situation was the opposite. The second image was a closeup where the 100 MP (which extends) is longer (physically). So the front element of the Zeiss was perhaps 2 cm closer to the cup compared to the Canon. It doesn\'t matter anyway - it\'s not something that would affect the amount of light entering the lens. Remember - these are fairly long 100mm lenses so the second close up was taken perhaps half a meter from the cup. A couple of centimeters of distance would have made no difference. The type of glass in the lenses and the coating affects light transmission much more.
The difference in FOV that you see is simply because neither the Canon nor the Zeiss are actually 100 mm lenses. The Zeiss is actually a 97.5 mm lens, not a 100mm. I don\'t have the equivalent number for the 100L but it is unlikely that it is exactly 100mm. Furthermore both lenses change focal length as you focus - and they change it differently.
Jun 23, 2010 at 02:17 PM
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