Michael Moore posted ...

FF vs. Crop sensor - for the right-brained

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FF vs. Crop sensor - for the right-brained

Category: General Discussion

Posted: 07-1-11 5:34 PM - Views: 2154

By: Michael Moore

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You always hear that a crop sensor makes lens X like lens Y on a FF sensor, so I wanted to compare a 50mm on my 7D with an 85mm on a 5D. Focus in both cases was on the water glass. Same exposure, f-stop, everything else. Used a tripod to guarantee the same POV. No post-processing. I thought it was interesting, and helpful to a right-brain type person like me that has to see the difference.

And there was more difference than I expected somehow.

And the pictures themselves are nothing special just my deck.

50MM on a 7D:
http://farm6.static.flickr.com/5315/5892004501_84cf1c3e2b_b.jpg

85MM on a 5D:
http://farm6.static.flickr.com/5311/5892005329_6fca1e3659_b.jpg
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Reply Nr.4 from John on 10-27-11 6:47 PM

Its the sensor size more than the lens that changes the DOF. Think about what a normal lens is on large format vs the size of medium format and FF. As the sensor (or film medium) get smaller the DOF increases.
Reply Nr.3 from Michael Moore on 07-6-11 10:27 PM

I guess I knew that intellectually, but I kind of had to see it in action. Like JT says, the difference in DOF was a bit of a surprise.

[b][i][quote]It should not be a surprise. Saying that a a crop sensor makes a lens X like a lens Y it is simply not true or at least it is misleading. Even if a 50mm mounted on a crop 1.6x sensor give the same result of a 80mm in terms of focal lenght, it remains a 50mm for all the other caracteristics like the DOF for example. so, it normal that the DOF of a 85mm is different than the 50mm one.
Kind regards
Paolo
--paolo[/quote][/i][/b]

Reply Nr.2 from Paolo Salina on 07-5-11 3:34 PM

It should not be a surprise. Saying that a a crop sensor makes a lens X like a lens Y it is simply not true or at least it is misleading. Even if a 50mm mounted on a crop 1.6x sensor give the same result of a 80mm in terms of focal lenght, it remains a 50mm for all the other caracteristics like the DOF for example. so, it normal that the DOF of a 85mm is different than the 50mm one.
Kind regards
Paolo
Reply Nr.1 from Zeiss Images on 07-2-11 6:37 PM

Interesting how the dof changes so much.
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