EF-S lenses on 1.3x crop such as the 1D MkIII

ecoleman

ecoleman

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I'm looking at buying a used 1D MkIII as an upgrade from my 40D. I have one EF-S lens which is the 17-55 f2.8 USM.

Will this lens work with the 1.3x sensor in this camera?
 
No worky, apart from the fact it would vignette the mirror would strike the rear of the lens. Not good :nono:
 
You won't even be able to mount it on the camera - the 1D doesn't have a mount that accepts EF-S lenses.
 
gcogger said:
You won't even be able to mount it on the camera - the 1D doesn't have a mount that accepts EF-S lenses.
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You're wrong there
 
Correct, all the Canon Eos cameras Film and Digital have the same EF mount. The difference lies in the protrusion of the rear element at the collar of some EF-s lenses, though not all, I think some Sigmas for instance do allow it without the mirror striking the rear element but still with the vignette (needs verification).
Anyway bottom line as per original question is that the 17-55 f2.8 wont work. Some brave souls have apparently got it to work (still vignetting though) by dismantling the lens and removing the plastic flange inside the metal lens collar of the 17-55 to allow the mirror to miss the rear element as long as you dont zoom back between the 17-20mm range (if you do the mirror clips the rear element) :eek: I mean, why bother ? :shrug: . In my book that is just not worth the risk and I would avoid any such workaround at all costs.
 
Iirc the Sigma 10-20 will work with Canon FF and 1.3 crop bodies, but will have serious vignettes
 
admirable said:
You're wrong there
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Gazamonk said:
Correct, all the Canon Eos cameras Film and Digital have the same EF mount. The difference lies in the protrusion of the rear element at the collar of some EF-s lenses, though not all, I think some Sigmas for instance do allow it without the mirror striking the rear element but still with the vignette (needs verification).
Anyway bottom line as per original question is that the 17-55 f2.8 wont work. Some brave souls have apparently got it to work (still vignetting though) by dismantling the lens and removing the plastic flange inside the metal lens collar of the 17-55 to allow the mirror to miss the rear element as long as you dont zoom back between the 17-20mm range (if you do the mirror clips the rear element) :eek: I mean, why bother ? :shrug: . In my book that is just not worth the risk and I would avoid any such workaround at all costs.
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Sorry guys, but you're both wrong. EF-S is a lens mount specification, and you can't mount an EF-S lens on a body that doesn't support them (at least not without modifying the lens mount).

Have you noticed that a Canon APS-C camera has two alignment marks round the lens mount? One is a red dot, that you line up when mounting an EF lens, and the other is a white dot, that you line up when mounting an EF-S lens. The 1D doesn't have the white dot.

You can mount things like the Sigma APS-C lenses on a 1D, but that's because they're EF lenses, not EF-S. Only Canon make EF-S lenses.
 
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The 1D series may be different, but the 5D will take an efs lens. I had the 'pleasure' of seeing a rather arrogant individual in college pick up a canon 17-55 kit lens, attach it and press the shutter..... Was not a nice noise
 
I give up
 
It may be that Canon added a baffle into later APS-H bodies to prevent EF-S lenses being mounted accidentally. The 1D4 has this baffle each side of the mirror and it physically prevents the extension behind the lens mount from fitting deep enough into the body for the mount to engage. I can state with absolute certainty that an EF-S 55-250 and 18-55 will not physically mount onto a 1D4.

Bob
 
OK guys, from Wikipedia:

"Canon designers have taken steps to ensure it is physically impossible to mount EF-S lenses on EF-only cameras."

Or, better still, from Canon themselves here:

"EF-S lenses have a mechanical configuration that makes it so that they cannot be mounted on cameras that are not compatible with ES-S lenses."

Or in this document:

"Canon EF-S mount lenses mount only onto Canon APS-C type DSLRs such as the EOS 20D – 60D, 7D, and digital Rebel series. They are specifically designed for the smaller APS-C sensor and mirror and will not mount onto larger format cameras such as the EOS-1D and 5D-series"

If you believe that Canon themselves don't know how their lens mounts work, then I guess there's no convincing you. Regardless, I'll say no more on the subject.
 
I'm guessing anyone using an EF-S lens on a ASPH camera hasnt just shaved off the back but has also swaped the mount for an EF one.
 
There are images on this very forum that have been taken with a Canon 1D body fitted with a Canon EF-s lens
 
The mount i.e. the metal EF bayonet is the same on all these cameras. The protrusion at the EF-s lens rear is whats different. The EF only bodies have an internal design that wont accept the protrusion. Adapt the protrusion and an EF-s lens will fit on all bodies but with the provisos i mentioned regarding mirror strikes.


Found this

http://www.flickr.com/groups/canondslr/discuss/72157604422834954/?search=10-22

If the bayonet mount was physically different surely that would be impossible, yes/no?
 
admirable said:
There are images on this very forum that have been taken with a Canon 1D body fitted with a Canon EF-s lens
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Looking at some photo's of the 1D3 and 1D4 body, it seems that Canon changed the shape of the mirror box when compared to th 1D2 and that's the reason that some 1D series will accept the EF-S being mounted whilst later ones won't.

Bob
 
My Canon 10-22 fits and works on my 1D MkIII with the plastic cap flicked out the back of the lens down to 11mm. Images are interesting.
 
ecoleman said:
So that's a no then :(

Thanks everyone. Looks like this may be a bit more expensive than expected.
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Not really, the baffle wasn't introduced until the mk4 if I've understood this correctly?
 
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