That the depth of field is the same for the following 2 setups?
T2i + 30mm @ f1.4
5Dmkii + Sigma 50mm @ f1.4
Not trying to get into a huge debate on what is better because I have no interest in full frame.
Thanks
JeffreyG "my bits and pieces are all hard"  More info | Oct 28, 2010 20:28 | #2 No, incorrect. The T2i + 30mm @ f/1.4 would give the same DOF as the 5D with 50mm stopped down to about f/2. My personal stuff:http://www.flickr.com/photos/jngirbach/sets/
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Woodworker Goldmember 2,176 posts Joined Aug 2009 Location: East Midlands, England More info | Oct 28, 2010 20:28 | #3 M'thinks you may have opened a can of worms. David
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themadman Cream of the Crop  18,871 posts Likes: 14 Joined Nov 2009 Location: Northern California More info | Oct 28, 2010 20:30 | #4 Depends how you frame it, how far you are from the subject, etc... Will | WilliamLiuPhotography.com
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Oct 28, 2010 20:32 | #5 LOL, I was afraid of that.
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XFaega Member  168 posts Joined Oct 2010 Location: Salt Lake City, UT More info | Oct 28, 2010 20:37 | #6 Good Question Canon EOS 5D MK II
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spiralspirit Senior Member 940 posts Joined Dec 2009 Location: Manitoba, Canada More info | Oct 28, 2010 20:39 | #7 nope, the full frame will have greater isolation. canon 1dmk2* Canon XSi * Sigma 24-70 f/2.8 EX DG * Canon 17-40mm f/4L * Sigma 70-200 f/2.8 EX * Canon 50mm f/1.8 *
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JeffreyG "my bits and pieces are all hard" More info | Oct 28, 2010 20:41 | #8 Hardcore wrote in post #11184586  LOL, I was afraid of that. Okay, hmm.... I don't understand why the difference in dof. Perhaps someone could explain why there is a difference at equiv. focal lengths + f stops. Because the focal lengths are not the same. The 5D is using a focal length that is roughly 1.6 times longer than the 7D to achieve the same framing. My personal stuff:http://www.flickr.com/photos/jngirbach/sets/
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Oct 28, 2010 20:44 | #9 JeffreyG wrote in post #11184640 Because the focal lengths are not the same. The 5D is using a focal length that is roughly 1.6 times longer than the 7D to achieve the same framing. Longer focal length at the same apeture and same subject distance = less DOF. Equivalent focal lenth as you term it is irrelevant. DOF depends on the actual focal length. Okay, perfect, that makes sense. Thanks for the response!
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hpulley Goldmember 4,390 posts Joined Oct 2009 More info | Oct 28, 2010 20:50 | #10 I wish no one had ever said equivalent focal length because it is just plain, 100%, totally, completely wrong... Angular coverage is what they should have used all along, then people wouldn't be confused by this stuff. flickr
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LowriderS10 Cream of the Crop  10,170 posts Likes: 12 Joined Mar 2008 Location: South Korea / Canada More info | Oct 28, 2010 21:17 | #11 hpulley wrote in post #11184700 I wish no one had ever said equivalent focal length because it is just plain, 100%, totally, completely wrong... Angular coverage is what they should have used all along, then people wouldn't be confused by this stuff. True...unfortunately, by the time this became an issue (digital age), the whole widespread usage of focal lengths had been around for a century, give or take, so it was too late to go back -=Prints For Sale at PIXELS=-
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