Resolution test, between crop (18MP) and fullframe (12.8MP)

Started Mar 12, 2013 | Discussions thread
qianp2k Forum Pro • Posts: 10,350
Re: The test was performed properly.

nedelcho wrote:

Didn't you see my second test, where I shoot at apertures f/4 for 60D and f/5.6 for 5D. What you are agreeing for, I can not understand? Here is a link in case you've missed it.

http://forums.dpreview.com/forums/thread/3398807?page=3#forum-post-51030488

Anyway I've made my point and I posted examples for anyone to see. If they see it, or not is their choice.

Not sure what's your point? Nobody denies Canon 18mp APS-C is able to outresolve 12.8mp 5D but you'd need the best lenses. If you want to prove that you seem achieve that goal.  However most APS-C owners don't use the top lenses, no mention 24-70mm is not in ideal walk-around range on 1.6x crop cameras.

In real world with most regular lenses, 5D outresolves 18mp APS-C. As I suggested, can you do similar test with 24-105L? Also do in low light on tripod and in shadow? 60D does best in bright sunlight.

You did these tests with an agenda that purposely give a huge favor to 60D with the best lens under the perfect light condition. Such mind-setup tests are meaningless.

I did a quick test last night between two cameras with 24-70L II and 24-105L against a dollar bill from close distance and only check very center area. I will post result later.

With 24-70L II, 60D is really capable of resolving details. 5D photo is still a bit sharper however. I think we need to compare at the same output size otherwise you will get an illusion that bigger one obviously has more resolution. I didn't have time last night to upsampling 5D photo to 60D's size. I think they will be very close.

With 24-105L, 5D clearly leads 60D in sharpness and fine details even in very center sweet-spot. After upsampling, 5D should still lead 60D a bit.

Here are the links for the RAW files for apertures from f/2.8 to f/11.

5D

http://dox.bg/files/dw?a=f5d27f7c45

http://dox.bg/files/dw?a=d4610bff50

http://dox.bg/files/dw?a=42e23cc7fa

http://dox.bg/files/dw?a=bb6aa3a8b1

http://dox.bg/files/dw?a=684c03219f

60D

http://dox.bg/files/dw?a=5e810ab3b1

http://dox.bg/files/dw?a=acf928c9b9

http://dox.bg/files/dw?a=162fa22499

http://dox.bg/files/dw?a=e02477d09c

http://dox.bg/files/dw?a=d453bd1517

For qianp2k, there is no clipping in the RAW files for both 5D and 60D and they're receiving equal amount of light, so it doesn't matter if the 5D is 1/3 more sensitive isn't it?

As I said it's well known 5D sensor is +1/3 EV oversensitive than standard ISO as I said. Many suggested to shoot -1/3EC in outdoor in daylight especially in bright sunlight. I still can see your 5D photo is a bit overexposed in 2nd test. In indoor or in low light you can leave 5D at 0EC.

This will be my last contribution to this discussion as it seems.

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