Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
next PZ lens test report: Olympus M.Zuiko 14-150mm f/4-5.6 ED
[quote name='Tiz' timestamp='1310224039' post='9863']

Does distortion correction mean that the image is firstly cropped and then extrapolated to the original MP count of the sensor? In other words, is a distortion corrected 12 MP image not a true 12 MP image anymore but a bloated 10 MP image?


Near enough. Distortion correction will end up discarding some regions of image and therefore the information left must be less than before. How much so is harder to quantify.

[quote name='Brightcolours' timestamp='1310227901' post='9866']

A wider or higher image will need more correction, the correction in not on pixel level, but on the total image level. You see the same with the same lens on APS-C and on FF (but more extreme).


If you look at distortion as a single figure barrel/pincushion correction, that may be the case. They can do a bit more than that, by expressing the distortion as a function of distance from image centre that can correct for more complex distortion types also. I don't know if they actually do that or not though... I have to assume they thought of all this when defining the standard so they have adequate information to be close enough.
<a class="bbc_url" href="">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.

Messages In This Thread
next PZ lens test report: Olympus M.Zuiko 14-150mm f/4-5.6 ED - by popo - 07-09-2011, 04:40 PM

Forum Jump:

Users browsing this thread:
1 Guest(s)