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Old Jul 29, 2005, 9:34 PM   #1
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I just picked up a Canon 10-22 EF-S lens and I only got it out of the box when I got home, so I can't comment on it, but it got me thinking.

I realize Canon has put something physically on these lenses to prevent them from being mounted on a non EF-S body, but assuming you modified the lens, what would the resulting image look like?

Like a vignette? Sides cut off? A small square in the middle of the frame?

I have seen this modification made to the lens on the net somewhere, but it was done with the inexpensive lens.

Anyway, I have no intention on doing this to the 10-22 (eek! I've wanted a lens with this focal length for about 20 years, so I'm not going to hacksaw it), but was wondering what the result would be.
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Old Jul 29, 2005, 10:30 PM   #2
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it would vignette horribly..

i have seen an 18-55 modified to EF for mount on a 10d, but the 10d has a 1.6x crop factor, so it worked out fine..
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Old Aug 1, 2005, 1:16 AM   #3
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From what I understand, a lens projects a circular image just slightly larger than the "film" it was designed for. I would imagine an EF-S lens would vignette all the way to black in the corners like H80 said. The only reason you get a rectangular image is because that is the shape of the film frame, the viewfinder nearly imitates that same shape.

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