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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 29 Mar 2012 (Thursday) 08:56
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What is the advantage of Canon EF-S lenses over EF?

 
msowsun
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Mar 29, 2012 20:17 |  #31

Frugal wrote in post #14174396 (external link)
EF-S lenses have the rear lens closer to the sensor on a crop camera.

melanopsin wrote in post #14174779 (external link)
I think that is incorrect. Both Canon APS-C and Canon FF EOS cameras have identical register distance.

Actually it is correct. Yes, APS-C, APS-H, and FullFrame cameras all share the same 44mm "Register" or "Flange Mount Distance", but EF-S lenses DO have the rear element positioned closer to the sensor. This theoretically allows for a smaller lens design to cover a smaller sensor. It also requires a smaller mirror so that it does not hit the rear element.


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msowsun
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Mar 29, 2012 20:26 |  #32

Maverique wrote in post #14175872 (external link)
Is their image circle actually smaller? I've seen people with EF-S lenses on their 5Ds and wondered if they're not cropping.

Yes, the image circle is smaller.

EF-S lenses can be easily modified to fit on a FF camera, but most EF-S lenses will vignette severely on a FF because of the smaller image circle. Some are usable at their longer focal lengths, but the mirror can sometimes hit the rear element

All 3rd party "Crop" lenses use a standard EF mount and will fit FF cameras without any mod and without any danger of hitting the mirror. But again most will vignette severely.


Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
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What is the advantage of Canon EF-S lenses over EF?
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
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