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Thread started 30 Sep 2013 (Monday) 21:25
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Canon 1DIII/Sigma 17-70 vignette issue...

 
Don ­ Madson
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Sep 30, 2013 21:25 |  #1

I've had my Sigma 17-70 2.8-4 for a couple years, and had it on a 50D then on a 7D for the last year or so. I recently bought a 1DmkIII, and was surprised to find that I now have a vignetting problem with the 1DIII. It wasn't an issue with the 50D nor the 7D.

The 1DmkIII, of course, is a 1.3x crop, as opposed to the prior 2 cameras. I have to go out to the 28mm index mark on the lens to lose the vignetting. How does this work? Shouldn't there be a greater chance of vignetting on the 1.6x crop body? Even closing down the aperture doesn't seem to matter.

What do those of you with the -H sensor use for a wide-to-short zoom? Does your lens/body combo show vignetting?

thanks!
Don


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topdslrs
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Sep 30, 2013 21:40 |  #2

From what I understanding is that vignetting is more visible on larger the sensor, that's because the smaller sensor doesn't capture the full lens's image, the "vignettes" on the corner are not captured by the smaller sensor. However this is an easy and very popular fix through software.


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Don ­ Madson
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Sep 30, 2013 21:51 |  #3

Thanks. It makes sense that a smaller sensor captures less of the center portion of the image, therefore eliminating the vignetting. I can always crop in post-processing, and in fact have set the camera to a 4:5 ratio, which crops the edges to some degree, making the vignetting less pronounced.

Regards!
Don


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topdslrs
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Sep 30, 2013 21:53 |  #4

Yes exactly, but like I said if you wish to capture everything, software can easily take care of things.


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Ilovetheleafs
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Sep 30, 2013 22:10 |  #5

it's because the Sigma 17 - 70 has a denotation (DC) which is for crop cameras of an APS-C sized sensor only but it is of an EF mount so it can mount on a 1.3 crop or a full frame but it will vignette. If you look at sigma lenses that will work with your camera with out any of the vignetting you'll want to grab a DG which is for 1.3 and full frame. It is also an EF mount.


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Don ­ Madson
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Sep 30, 2013 22:15 |  #6

Thanks! I'm guessing that it will still be fine on the 1.6 crop!
Thanks, ilovetheleafs!

Don


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gremlin75
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Oct 01, 2013 00:14 |  #7

Don Madson wrote in post #16337183 (external link)
I'm guessing that it will still be fine on the 1.6 crop!

That is correct as the lens of made for the APS-C sized sensor. Made for a smaller sensor means smaller image circle. Add a lager sensor to the equation and you get vignetting. Bigger the sensor and more severe the vignetting.




  
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Canon 1DIII/Sigma 17-70 vignette issue...
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