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12/27/2004 02:23:23 AM · #1 |
Just a quickie, I've noticed on lens review sites that barreling and pincusion distortion is mentioned - is this applicable to dSLRs using an APS sized sensor?
Darren
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12/27/2004 02:26:42 AM · #2 |
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12/27/2004 03:18:46 AM · #3 |
Cheers Chris,
I know that you are going through a similar process as I've just been through regarding reading up on just about everything as you enter the world of dSLR.
I'm hoping that maybe you (or anyone) can clarify the reason why the smaller sized sensor will still suffer from edge distortion when there is a 1.5 (or greater) crop factor in effect.
When I zoom out a bit on my FZ2 when using my TCON17 teleconverter vignetting starts to appear, when I crop the image and thus remove a percentage of the edges then the distortion is no more, I can't see why the same effect will not take place with the crop factor of my dSLR.
Thanks in advance :)
Darren
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12/27/2004 03:24:40 AM · #4 |
i'm not sure i entirely understand 'crop factor', but my interpretation was different from yours.. being, that somehow the camera essentially focuses the image from the lens onto a smaller sensor.. i didn't think it so much 'cropped' part of the image off (but i may be wrong, this is all an assumption, based off my first-instinct interpretation).. but maybe that explains why the image would actually increase in magnification.. hmm.. thought i was gonna answer your question here, but now i'm all confused!
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12/27/2004 07:41:55 AM · #5 |
My understanding is that if a lens shows vignetting, pincushion or barrel distortion when on a film camera those distortions will be reduced or non-existent when the same lens is put on a DSLR that does not have a full size sensor since the edges seen by the lens would not be captured by the sensor.
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12/27/2004 08:05:42 AM · #6 |
Originally posted by cpanaioti:
My understanding is that if a lens shows vignetting, pincushion or barrel distortion when on a film camera those distortions will be reduced or non-existent when the same lens is put on a DSLR that does not have a full size sensor since the edges seen by the lens would not be captured by the sensor. |
Yep this is the case. The reason the term "crop factor" arose is because cropping's exactly what happens. The lens still casts the same size image circle, but because the sensor is smaller, it only records the central portion.
This will have the effect of reducing various lens problems including vignetting, barrel/pincusion, CA, corner softness, etc.
Still, that doesn't mean that a lesser-quality lens will seem better on a DSLR. In the area that they do record, DSLRs record a very high density of information. Lenses with "issues" tend to fare worse on DSLRs. I was very surprised how brutal my 10D is in revealing all the subtle shortcomings of my lenses.
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