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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 15 Mar 2010 (Monday) 11:58
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Third party/prime EF-S lenses

 
S.C.Williams
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Mar 15, 2010 11:58 |  #1

Do you guys think there will eventually be prime EF-S lenses from Canon or third party companies making lenses with the EF-S mount? Seems like an interesting, yet plausible concept to me.

Steve


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spacetime
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Mar 15, 2010 12:01 |  #2

Would lenses like the Sigma 30mm 1.4 qualify? Perhaps not technically an EF-S mount they can only really be used on crop due to the reduced image circle.




  
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botw
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Mar 15, 2010 12:02 |  #3

Dont forget the 60 macro either.


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S.C.Williams
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Mar 15, 2010 12:06 |  #4

botw wrote in post #9800569 (external link)
Dont forget the 60 macro either.


Yeah forgot about that. But that's just one prime, I'd like to see more.

Steve


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tkbslc
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Mar 15, 2010 12:11 |  #5

Do you mean lenses only good on 1.6x crop cameras, or a true EF-S mount?

Honestly, for any lens past about 45mm, there is no sense in making it for crop only cameras as their is little to no benefits. The 60mm is not any smaller or lighter because it is a 1.6x crop lens. I do hope someone comes out with some reasonably fast wider primes for crop, though. There is definitely a market for prime lenses at 15, 20, 24, 30mm and as they are retrofocal, the reduced image circle would help make them cheaper and smaller.


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S.C.Williams
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Mar 15, 2010 12:15 |  #6

tkbslc wrote in post #9800619 (external link)
Do you mean lenses only good on 1.6x crop cameras, or a true EF-S mount?
There is definitely a market for prime lenses at 15, 20, 24, 30mm and as they are retrofocal, the reduced image circle would help make them cheaper and smaller.

Yes true EF-S mount.

Exactly!

Steve


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Mar 15, 2010 12:16 as a reply to  @ S.C.Williams's post |  #7

why does it matter if its an EF-s mount?


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purelithium
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Mar 15, 2010 12:18 |  #8

Well the EF-S mount is proprietary canon, there's no point for third party companies to license another nearly identical mount for more money when they already have a license that works fine for the same system.


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tkbslc
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Mar 15, 2010 12:19 |  #9

None of the third parties are going to design EF-S mount lenses. They need their lenses to work on Pentax, Sony, Nikon, etc, as well as Canon. EF-S is a very specific Canon design as the lens' rear element can extend backward into the mirror box while focusing. If they designed a lens like that it would make it harder to guarantee cross system compatibility.

Most just design for 1.5x crop compatibility with a non protruding rear element and then it is simply a matter of slapping different mounts with depth adjustment to get the lens to work on all the different systems.


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Jon
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Mar 15, 2010 12:19 |  #10

Well, since nobody but Canon's tackled the EF-S mount, I really doubt you'll see anyone else start to make any lenses in the EF-S mount. Why should they bother developing yet another lens mount to have to keep parts in stock?


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FMX
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Mar 15, 2010 12:21 |  #11

05Xrunner wrote in post #9800662 (external link)
why does it matter if its an EF-s mount?

^^ i'm with this guy... why does the mount type matter as long as it can connect to the camera?




  
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tkbslc
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Mar 15, 2010 12:22 |  #12

I honestly don't know why Canon keeps making EF-S lenses. Judging from Sigma's lenses, it is not a requirement for making crop only lenses. It seems like it would be easy enough to abandon the design for future lenses, which would make a nikon-style crop mode an option on future 1.3x and FF cameras.


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S.C.Williams
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Mar 15, 2010 12:28 as a reply to  @ tkbslc's post |  #13

Ok thanks guys. Didn't really take it all into account, but I had to ask. But what about more (cheaper) prime lenses?

Steve


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bohdank
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Mar 15, 2010 12:50 |  #14

The "mount" is the same, EF/EF-S.

The lens, such as the 10-22, won't mount on a FF because Canon installed a baffle in the rear of the lens that makes it impossible for the lens to fit into the mirror box. If you pop the baffle off, the lens has no problems being "mounted" in a FF.

The issue with EF-S lenses is that the rear element protrudes further into mirror box than a FF can handle without the mirror hanging up on the back of the lens.


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SkipD
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Mar 15, 2010 13:40 |  #15

bohdank wrote in post #9800884 (external link)
The "mount" is the same, EF/EF-S.

The lens, such as the 10-22, won't mount on a FF because Canon installed a baffle in the rear of the lens that makes it impossible for the lens to fit into the mirror box. If you pop the baffle off, the lens has no problems being "mounted" in a FF.

The issue with EF-S lenses is that the rear element protrudes further into mirror box than a FF can handle without the mirror hanging up on the back of the lens.

... and ALL currently produced third-party "digital only" lenses that are defined as being for APS-C format cameras will work on ANY EOS camera. They will, very likely, vignette on EOS cameras other than APS-C format cameras.


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Third party/prime EF-S lenses
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