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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 24 Nov 2012 (Saturday) 01:08
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Am I correct in presuming the 24-105 on FF is a bit wider than the 17-55 on crop?

 
jrmy
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Nov 24, 2012 01:08 |  #1

Curious as to how the focal lengths compare.


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Earwax69
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Nov 24, 2012 01:11 |  #2

yes, 24mm is like 15mm on crop. More like the 15-85mm in fact. (24-136mm)


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ed ­ rader
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Nov 24, 2012 01:19 |  #3

jrmy wrote in post #15282150 (external link)
Curious as to how the focal lengths compare.

17 x 1.6 = 27.2mm


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melcat
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Nov 24, 2012 05:18 |  #4

The 24-105 has a huge 4.3% barrel distortion at 24mm, which I would not leave uncorrected, whille the 17-55 has a more acceptable 2.0%. (Source: www.photozone.de (external link).) Hence you will lose some angle of view on the full frame lens correcting that in software or in the camera's JPEG engine.




  
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Earwax69
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Nov 24, 2012 05:33 |  #5

Having the 15-85mm I can tell you that the 2mm make a big difference. However, you might be better with a real wide-angle lens.


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cdang
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Nov 24, 2012 06:00 |  #6

27 - 88 F4.48 ?




  
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2n10
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Nov 24, 2012 09:19 |  #7

If you are using the 24-105 on the crop, no, the 17 is wider. If you are comparing the 24 on FF and the 17 on crop then the 24 is wider.


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RPCrowe
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Nov 24, 2012 10:27 as a reply to  @ 2n10's post |  #8

I seldom need anything wider than my 17mm lens on my 1.6x crop cameras. I have a 12-24mm f/4 Tokina for when that need occurs.

Most often, I use the 17-55mm f/2.8 lens beside my 70-200mm f/4L IS on two cameras (7D and 40D). Occasionally, I will use another combination such as the 12-24mm + 17-55mm when I need wide angle coverage.


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Nov 24, 2012 10:39 |  #9

15mm on APS-C = 24mm on FF = 84 degree diagonal angle of view

18mm on APS-C = 28mm on FF = 74 degree diagonal angle of view

17mm on APS-C = 26.8mm on FF = 77 degree diagonal angle of view


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Am I correct in presuming the 24-105 on FF is a bit wider than the 17-55 on crop?
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