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Thread: EF vs EF-S Lens (Crop Factor)

  1. #1

    Default EF vs EF-S Lens (Crop Factor)

    Hi guys,

    Would like to know the diff between a 17-40L, 17-55 & 17-85.
    At 17mm focal point, are these equivalent to 27mm on a Canon APS-C 400D body?
    17-40L is an EF lens whereas the other 2 are EF-S lens.



    Thanks!
    Last edited by ssworx; 7th May 2012 at 01:36 AM. Reason: more info

  2. #2

    Default Re: EF vs EF-S Lens (Crop Factor)

    Quote Originally Posted by ssworx View Post
    Hi guys,

    Would like to know the diff between a 17-40L, 17-55 & 17-85.
    At 17mm focal point, are these equivalent to 27mm on a Canon APS-C body?
    17-40L is an EF lens whereas the other 2 are EF-S lens.

    Thanks!

    zzzz see for yourself.

    AbelCine - Field of View Calculator

    anyway focal length doesnt change only fov.

  3. #3

    Default Re: EF vs EF-S Lens (Crop Factor)

    Based on the Canon website, 17-55 & 17-85 has the same angle of view at 17.
    Diagonal: 78
    Horizontal: 68
    Vertical: 48

    However, 17-40 reads this:
    Diagonal: 104
    Horizontal: 93
    Vertical: 70

    Product Comparison - Canon Singapore - Personal

  4. #4

    Default Re: EF vs EF-S Lens (Crop Factor)

    Quote Originally Posted by ssworx View Post
    Based on the Canon website, 17-55 & 17-85 has the same angle of view at 17.
    Diagonal: 78
    Horizontal: 68
    Vertical: 48

    However, 17-40 reads this:
    Diagonal: 104
    Horizontal: 93
    Vertical: 70

    Product Comparison - Canon Singapore - Personal

    and? ...

  5. #5

    Default Re: EF vs EF-S Lens (Crop Factor)

    Why is the angle of view diff @ 17mm for the 17-40L EF lens?

  6. #6

    Default Re: EF vs EF-S Lens (Crop Factor)

    Quote Originally Posted by ssworx View Post
    Why is the angle of view diff @ 17mm for the 17-40L EF lens?
    cos. EF-S cannot be mounted on full frame cameras. -_-

  7. #7

    Default Re: EF vs EF-S Lens (Crop Factor)

    Hmmm...sorry I do not get it.
    So if the 17-40 is mounted on a crop body, will the 17mm be the same as EF-S lenses (17-55 & 17-85).

    Thanks a mil!

  8. #8

    Default Re: EF vs EF-S Lens (Crop Factor)

    Quote Originally Posted by eleveninth View Post
    zzzz see for yourself.

    AbelCine - Field of View Calculator

    anyway focal length doesnt change only fov.
    Did you go to the site?

    Quote Originally Posted by ssworx View Post
    Hmmm...sorry I do not get it.
    So if the 17-40 is mounted on a crop body, will the 17mm be the same as EF-S lenses (17-55 & 17-85).

    Thanks a mil!

  9. #9

    Default Re: EF vs EF-S Lens (Crop Factor)

    yep sorry but i do not understand what you meant & how to use the comparision.
    I chose the 7D to compare with a 35mm.
    But what i would like to know is EF vs EF-S lenses on a crop body?
    Why does the angle differ @ 17mm for EF lenses?

    Thks!

  10. #10

    Default Re: EF vs EF-S Lens (Crop Factor)



    choose the 5D and 7D ( FF vs APSC )

    In the comparison the yellow box is the sensor size from the APSC the rest is what you would see on a FF camera at that focal length.

    Anyway what camera u using. I assume it's APSC
    Last edited by eleveninth; 7th May 2012 at 02:18 AM.

  11. #11

    Default Re: EF vs EF-S Lens (Crop Factor)

    sorry, maybe i confused you.
    I know the diff of using the lenses on a FF.
    However, I do not know the diff of using a 17-40 vs 17-55 or 17-85 on a cropped body.
    the 17mm on the EF-S lenses show the same angle. But not the 17-40 EF (based on canon website)
    What i would like to know is would they be the same angle @ 17mm(all 3 lenses on a CROP BODY)

    appreciate your patience dude.

  12. #12

    Default Re: EF vs EF-S Lens (Crop Factor)

    Quote Originally Posted by ssworx View Post
    sorry, maybe i confused you.
    I know the diff of using the lenses on a FF.
    However, I do not know the diff of using a 17-40 vs 17-55 or 17-85 on a cropped body.
    the 17mm on the EF-S lenses show the same angle. But not the 17-40 EF (based on canon website)
    What i would like to know is would they be the same angle @ 17mm(all 3 lenses on a CROP BODY)

    appreciate your patience dude.

    lol. pls refer to yellow box.

    I'm not confused.

  13. #13

    Default Re: EF vs EF-S Lens (Crop Factor)

    sorry i really do not understand.
    So will the 17mm on the EF & EF-S be the same on a cropped body, which is 27mm?

    thks once again

  14. #14

    Default Re: EF vs EF-S Lens (Crop Factor)

    Quote Originally Posted by ssworx View Post
    sorry, maybe i confused you.
    I know the diff of using the lenses on a FF.
    However, I do not know the diff of using a 17-40 vs 17-55 or 17-85 on a cropped body.
    the 17mm on the EF-S lenses show the same angle. But not the 17-40 EF (based on canon website)
    What i would like to know is would they be the same angle @ 17mm(all 3 lenses on a CROP BODY)

    appreciate your patience dude.
    to answer your question:

    Yes. they would all look the same on a crop body.

    why? because all lenses put the same focal length down on the body. it would be confusing to have one set of focal lengths for FF lenses, and lenses made for Crop bodies

    just that, you have to remember to multiply the focal length on any lens by the crop factor to get the 35mm equivalent field of view.

    i.e. if you're using a 50mm FF lens, you need to have 50mm x 1.5 (Nikon and Sony APS-C crop factor) which will give you 75mm

    and even if you're using a 50mm Lens made for a crop body, you'll still have to apply 50mm x 1.5 to get the equivalent FOV.

    and yes. i think this is what you're asking

  15. #15

    Default Re: EF vs EF-S Lens (Crop Factor)

    lol.

    kei so good straight away give answer. bwhahaha.

  16. #16

    Default Re: EF vs EF-S Lens (Crop Factor)

    Quote Originally Posted by kei1309 View Post
    to answer your question:

    Yes. they would all look the same on a crop body.

    why? because all lenses put the same focal length down on the body. it would be confusing to have one set of focal lengths for FF lenses, and lenses made for Crop bodies

    just that, you have to remember to multiply the focal length on any lens by the crop factor to get the 35mm equivalent field of view.

    i.e. if you're using a 50mm FF lens, you need to have 50mm x 1.5 (Nikon and Sony APS-C crop factor) which will give you 75mm

    and even if you're using a 50mm Lens made for a crop body, you'll still have to apply 50mm x 1.5 to get the equivalent FOV.

    and yes. i think this is what you're asking
    ok i got it now! thks for all ur patience!

  17. #17

    Default Re: EF vs EF-S Lens (Crop Factor)

    Quote Originally Posted by eleveninth View Post
    lol.

    kei so good straight away give answer. bwhahaha.
    not so anal tonight i haven't slept in almost 23 hours

    Quote Originally Posted by ssworx View Post
    ok i got it now! thks for all ur patience!
    no worries

    all i want is a cup of starbucks coffee venti size

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