Return of Interesting article on DxO about 5D III and D800...

Started Apr 10, 2013 | Discussions thread
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Re: not sharpness
In reply to Steen Bay, Apr 11, 2013

Steen Bay wrote:

qianp2k wrote:

The key factor is that no such lens ever existed or ever can be designed and manufactured as long as we still stay in glass lens that can fully resolve 41mp from the sensor. Even there is such perfect zero-lost lens ever existed, 41mp from Nokia 808 still will not be real 41mp after deduction from huge crop enlargement. It would resolve far less than 36mp D800, 22mp 5D3 or even will not resolve more than 12.8mp 5Dc.  Don’t forget crop penalty.

That's why I said there is simply no such sensor resolution as it has to go thru lens and has to face crop enlargement and crop penalty (FF also has crop penalty but just less and MF has much lesser).

There isn't any 'crop penalty' if the lens' image circle matches the sensor size. A lens designed for e.g. a 2/3" (4x crop) sensor can resolve much more lp/mm than any FF lens. If we take for example a 5D3 + 24-70/2.8L II and downscale the whole system by factor 4, then we'll get a really cute little 22mp DSLR  with a 6-17.5/2.8 lens that would have pretty much the same resolution as the 5D3 ("Pretty much", because diffraction complicates things a bit).

Actually should be 6-17.5mm/F0.7 zoom that not only not cute and small anymore but impossible to be manufactured by a material named as "glass"

That’s why I keep using 600mm lens as an example if no "crop penalty".  Nobody should buy bulky and super expensive 600mm/F4.0 lens to use on FF cameras but should use 300mm/F4.0 on 2.0x crop mFT/FT cameras (such as E-5 or EM-5) or even better 30mm/F4.0 on a 20x crop camera to achieve the same resolution when you frame the subject into the same AOV. We know Olympus tried hard and failed badly in its E-x series DSLRs (how many if any still use at sideline of NFL or Olympic games?), no mention on a 20x crop camera, LOL.

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