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

Started Mar 12, 2013 | Discussions thread
ultimitsu
ultimitsu Veteran Member • Posts: 6,650
Re: The test was performed properly.

Great Bustard wrote:

Well, it was almost done properly. ...

You are looking at this test as how it emulates real world situation, I agree it can. But it was not set out to merely do so, it is set out to disapprove the theory that " with imperfect lens, at some point, 5D1 will out-resolve 60D." To that end, it is done completely wrong.

To prove this argument wrong, you need to shoot with identical imperfect lens. The test is wrong because 24-70II is quite close to a perfectly, made worse by it was less perfect on 5D than it is on 60D due to aperture difference.

All systems suffer the same from diffraction softening at the same DOF, but all lenses do not suffer from the same aberrations at the same DOF.

My view is that at F11 even without diffraction consideration, lens resolution power is reduced by virtue of so much information now passes through a much narrower section of glass.

Given how many landscape photographers are shooting at even f/16 on FF, it is ingenuous to cry "foul" for this particular test.

Just because people shoot F16 does not mean F16 is fine for the purpose for this test. People shoot F16 because for some scenes they must use F16 - the lens is far from perfect but the shot requires. What we are dealing here is whether 60D received unfair preferential treatment than 5D1 in what is purported to be a test.

This test is what one would call "rubbish in rubbish out".

Rather, it is a good example of a comparison of a deep scene at the same DOF.

It is a good example of a comparison of a deep scene at the same DOF, if comparison of a deep scene at the same DOF was the purpose. But it is not the purpose. For its purpose ( disapprove the theory that " with imperfect lens, at some point, 5D1 will out-resolve 60D."), it is "rubbish in rubbish out".

Post (hide subjects) Posted by
(unknown member)
MOD schmegg
MAC
MOD schmegg
MAC
MOD schmegg
MAC
MOD schmegg
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow