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DPChallenge Forums >> Tips, Tricks, and Q&A >> 200mm = 456mm?
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Canon EOS-40D
Canon EF-S 17-55mm f/2.8 IS USM
03/20/2009 06:20:02 PM · #1
Okay..just bought the 70-200mm Sigma lens. I have a photo where the exif says it was taken at 456mm?? What gives with that? I have the 40d so I know there is actually some difference with the crop factor, but this doesn't make sense to me. I thought it was 1.6 or something like that which makes a 200mm more like 320? I'm not a numbers person. Can someone explain in english how I got a 456mm shot?
Panasonic Lumix DMC-LX5
Canon EF 24-105mm f/4.0 L IS
03/20/2009 06:33:50 PM · #2
Did you have a 1.4x tele-extender on it? Otherwise perhaps it's a problem with a third party lens and the 40D.
Pentax K10D
Pentax DA 18-55mm f/3.5-5.6 AF
03/20/2009 06:57:09 PM · #3
It's either because it's a 3rd party lense or it's just a newer lens.

Still have unknown or incorrect info lens info while using LR2 (camera RAW).
Canon EOS-40D
Canon EF-S 17-55mm f/2.8 IS USM
03/20/2009 11:37:56 PM · #4
No extender, but it is an older sigma lens.
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