Any harm in putting a crop lens on a FF camera?

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Sigma 10-20 on a 5D MKII
 
Why is the vignette at an angle like that?
I'v used a cheap DX kit 18-55 on my D3 when I broke my 28-70 and had to work but only needed low res images so shot on DX crop so there was no vignette.
Think I tried a DX 5-200 on it too and there was only any vignetting right at one end (wide?) of the zoom range.
I'd be wary of putting ef-s lenses on a Canon ff body as if you look at an ef or ef-l and compare it to an ef-s, the ef-s protrudes into the body more and may as andrewc mentioned cause the mirror to collide, not something I'd want to happen!
 
I think I'm right in saying that only Canon make EF-S mount lenses, with the protruding rear element. These are designed not to fit on a full-frame body.

Third-party manufacturers make EF-mount lenses that are designed for crop sensors, i.e. they will physically mount on a full-frame body - as Schizophonic did - but vignette the images.

(Is that piece of wood on the left meant to be curved at the bottom, or is there some extreme barrel distortion going on?!)

If you were desperate, there'd be nothing stopping you shooting vignetted images like Schizphonic's example and then cropping them afterwards to give a useable lower-res picture. You could probably squeeze a few more pixels out of them if the cropping was being done manually.

A.
 
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Anorakus said:
I think I'm right in saying that only Canon make EF-S mount lenses, with the protruding rear element. These are designed not to fit on a full-frame body.

Third-party manufacturers make EF-mount lenses that are designed for crop sensors, i.e. they will physically mount on a full-frame body - as Schizophonic did - but vignette the images.

(Is that piece of wood on the left meant to be curved at the bottom, or is there some extreme barrel distortion going on?!)

If you were desperate, there'd be nothing stopping you shooting vignetted images like Schizphonic's example and then cropping them afterwards to give a useable lower-res picture. You could probably squeeze a few more pixels out of them if the cropping was being done manually.

A.
Click to expand...

I took it at an angle because it was a quick shot. Yes that piece of wood is supposed to be bent.

A member here said it may damange the shutter from the lens, how would that work exactly (just curious)
 
I don't know about damaging the shutter - EF-S lenses can damage the mirror due to the protruding rear element - but Canon have designed the lenses not to mount on a full-frame camera to prevent this happening.

You're using a third-party EF 'crop' lens and you evidently took this picture with no ill-effects, so unless anyone else can say otherwise, I'd say crack on! :)

A.
 
If you had the hood on, remove it, and you'll see more in the frame.

it's a cool way of getting really wide angles without spending a bomb on full frame lenses.
 
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