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DPChallenge Forums >> Hardware and Software >> Focal length for UWA lenses
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 10/12/2013 10:57:34 AM · #1
Having never owned a UWA lens, I have a question. On a crop sensor body, is there a significant difference in coverage between a 10mm or 11mm or 12mm focal length?

Trying to decide between some lenses and don't know if that 1 or 2mm at widest focal length is worth worrying about?

Any input appreciated.
 10/12/2013 11:19:36 AM · #2
Hey Garry I dont think you will see much between 10 to 11 but you will see some loss between 10 to 12. I have the sigma 10-20 and really avoid using it wide open at 10 because it makes the edges super soft unless I just want a super wide shot. So I stay within the 12-20 range and it does great. Its a great and fun lens for the $$
 10/12/2013 11:26:28 AM · #3
Originally posted by Damon:
Hey Garry I dont think you will see much between 10 to 11 but you will see some loss between 10 to 12. I have the sigma 10-20 and really avoid using it wide open at 10 because it makes the edges super soft unless I just want a super wide shot. So I stay within the 12-20 range and it does great. Its a great and fun lens for the $$


Thanks, D. Never considered the Tamron 11-16, but getting good reviews. Still indecided whether the Canon 10-22 is $$$$ better spent than the Sigma or other.
 10/12/2013 12:18:20 PM · #4
There are diminishing returns for decreasing focal length for rectilinear lenses. Unlike fisheye lenses, which can have outrageous FoV, rectilinear lenses are limited by the desire to keep straight lines straight.
For APS-C cameras, specifically the Canon 1.6-crop variety:
@12mm, horizontal FoV is 86.0°
@11mm, horizontal FoV is 91.0°
@10mm, horizontal FoV is 96.4°
 10/12/2013 02:37:23 PM · #5
The difference between 10mm and 12 mm is very noticeable. I have never compared at 11mm. I know that when I went FF and was using the 17-40mm, I missed the extra FOV of the 10mm on the cropped body. I went to the 16-35mm and got it back, and I do notice the difference myself. So I'd say yeah, a single millimeter DOES matter, for me at least.
 10/12/2013 02:42:11 PM · #6
Is it as noticeable on a cropped sensor camera?

Currently, I work with the 450D. UNFORTUNATELY I haven't been able to upgrade. :(

10/12/2013 05:24:31 PM · #7
Originally posted by Denielle:
Is it as noticeable on a cropped sensor camera?

Yes, that's what I was saying. From 10 to 12 is a noticeable jump. Look at it this way: TWENTY PERCENT of 10 is 2, so going from 10mm to 12 mm is a 20% increase in focal length...
 10/12/2013 05:49:15 PM · #8
Originally posted by Bear_Music:
Originally posted by Denielle:
Is it as noticeable on a cropped sensor camera?

Yes, that's what I was saying. From 10 to 12 is a noticeable jump. Look at it this way: TWENTY PERCENT of 10 is 2, so going from 10mm to 12 mm is a 20% increase in focal length...


Didn't pay attention earlier. I wa thinking the thread was mentioning a FF camera.
Thanks Bear
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