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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 21 Jul 2014 (Monday) 20:13
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EF-S Lenses on FF Body

 
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Jul 21, 2014 20:13 |  #1

SO I stuck my Sigma 10-20 f3.5 on the 5D3, just to see what it would look like as was lending the lens to a friend who is starting out. Turns out it's really good at c. 15mm & up.
Anybody else have any lenses that they have tried this out with?
Attached is a pic of my feet at 10mm on the 5D3 note the huge dark circle on either edge


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Jul 21, 2014 20:26 |  #2

if you put a 1.4TC on it, it will get rid of the vignetting


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Jul 22, 2014 13:29 |  #3

Zooming into 14mm will do the same and keep it at f3.5. So I now have a useable 14-20 f3.5 lens for my 5d3. Judt wondering if anybody else has tried this out & what EF-S lenses work?


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Jul 22, 2014 13:33 |  #4

Heya,

Your Sigma is not EF-S. That is the mount type. It's not. It's EF. It's simply designed for APS-C, so the elements size and position are different. That's why it's able to mount to your full frame. Find an EF-S lens by Canon and see if it attaches or not, and you'll understand the difference.

Third party (read: Sigma, Tamron, Samyang, Rokinon, etc) "for APS-C" lenses are EF mount. Not EF-S. You'll just notice heavy vignetting from them at very wide angles, but they work. You simply watch for protrusion too far into your camera to prevent the mirror from slapping it.

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Jul 22, 2014 13:41 |  #5

I believe at the moment only Canon makes EF-S mount lenses. All the third party lenses still use the EF mount thus will work on FF bodies but as you found in some cases will vignette heavily.

Mounting the EF-S lenses on a FF sometimes work but there are risks and the lenses need modification (removal of rear baffle. Some here have modified the EF-S 10-22 to work from what I remember if you set it to 10mm the mirror hits the back of the lens. Not good.


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Jul 22, 2014 13:44 |  #6

Hmm, I always thought mounting the 1.4 was the best way to get rid of the vignette...all third party ASPC lenses will mount. The tokina 11-16mm is ok at 16mm , you can pop the baffle out of the 10-22mm to put a 1.4 on it as well


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Jul 22, 2014 13:51 |  #7

Of all the worthwhile slapping that needs to be done from time to time a mirror off the back of a lens is not one of them.

Interesting thanks for the info, I never new about the 3rd party design aspect. Guess I'd better be carful so...


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Jul 22, 2014 13:52 |  #8

Two Hot Shoes wrote in post #17048767 (external link)
Of all the worthwhile slapping that needs to be done from time to time a mirror off the back of a lens is not one of them.

Interesting thanks for the info, I never new about the 3rd party design aspect. Guess I'd better be carful so...

Slapping your mirror is not a good thing. :):) The camera can go blind.


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Jul 22, 2014 15:39 |  #9

Could you use your tiniest macro extension to mount it? Thereby protecting the mirror?

I would have to experiment with this.. would it just restrict me to close focusing?


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Jul 22, 2014 15:45 |  #10

Two Hot Shoes wrote in post #17048767 (external link)
Of all the worthwhile slapping that needs to be done from time to time a mirror off the back of a lens is not one of them.

Interesting thanks for the info, I never new about the 3rd party design aspect. Guess I'd better be carful so...

None of the third party APS-C lenses will be hit by the mirror at any focal length, that is why it is safe for them to have an EF mount. The only lenses that protrude far enough back to be hit are made by Canon and they are all EF-S mounts and would have to be modified to fit a FF body.




  
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Jul 22, 2014 20:53 |  #11

sandpiper wrote in post #17049013 (external link)
None of the third party APS-C lenses will be hit by the mirror at any focal length, that is why it is safe for them to have an EF mount. The only lenses that protrude far enough back to be hit are made by Canon and they are all EF-S mounts and would have to be modified to fit a FF body.

I found this out the hard way when I tried to stick an ef-s lens on my 5d classic just to store it, while I shot with the lens from the 5d on my XTI....knocked the mirror off its mount in the middle of my sisters wedding! Thankfully I was able to stick it back on easily to finish the shoot.


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Jul 22, 2014 21:01 |  #12

sandpiper wrote in post #17049013 (external link)
None of the third party APS-C lenses will be hit by the mirror at any focal length, that is why it is safe for them to have an EF mount. The only lenses that protrude far enough back to be hit are made by Canon and they are all EF-S mounts and would have to be modified to fit a FF body.

Point-n-shoot-n wrote in post #17049615 (external link)
I found this out the hard way when I tried to stick an ef-s lens on my 5d classic just to store it, while I shot with the lens from the 5d on my XTI....knocked the mirror off its mount in the middle of my sisters wedding! Thankfully I was able to stick it back on easily to finish the shoot.

Sorry, what you say makes no sense.

I think you may have bumped the focus screen retaining clip and caused the focus screen to drop. Then you pushed it back up? That makes more sense as it has happened to others as well .

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Jul 22, 2014 21:08 |  #13

Point-n-shoot-n wrote in post #17049615 (external link)
I found this out the hard way when I tried to stick an ef-s lens on my 5d classic just to store it, while I shot with the lens from the 5d on my XTI....knocked the mirror off its mount in the middle of my sisters wedding! Thankfully I was able to stick it back on easily to finish the shoot.

Baah! Pesky mirror just makes noise anyway. Who needs it?


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Jul 22, 2014 21:11 |  #14

Point-n-shoot-n wrote in post #17049615 (external link)
I found this out the hard way when I tried to stick an ef-s lens on my 5d classic just to store it, while I shot with the lens from the 5d on my XTI....knocked the mirror off its mount in the middle of my sisters wedding! Thankfully I was able to stick it back on easily to finish the shoot.

i'm amazed you were able to just mount an EF-S lens on there without altering it.


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Jul 22, 2014 21:25 |  #15

DreDaze wrote in post #17049645 (external link)
i'm amazed you were able to just mount an EF-S lens on there without altering it.

He didn't say that he mounted it. He said he tried to mount it. The "EF-S" part that sticks into the mirror box area can contact the focus screen retainer and cause the focus screen to come loose.


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EF-S Lenses on FF Body
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