Is the PanLeica 25 f/1.4 equal to a 50 mm f/1.4 on Canon FF?

Started Aug 28, 2012 | Discussions thread
Anders W
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Re: No, not equal, superior, IQ, build quality, color, contrast..
In reply to jim stirling, Aug 31, 2012

jim stirling wrote:

Gunnlaugur Gudmundsson wrote:

everything that matters is better

not numbers & mathematics

the picture taking...

so, if you like to take pictures, the PanaLeica is miles better...

( talk from experience, having owned and used all the cameras and lenses in question

The Nikon 50mm f1.4G is £150 cheaper than the 25mm and obviously provides half the DOF if you wish to play with really shallow DOF. The 50mm F1.4G easily out resolves the 25mm at every aperture {system advantage} . In fact looking at the Photozone results below I am actually quite surprised how poor the extreme edge performance of the 25mm F1.4 is wide open. At equal DOF the 50mm simply does better , comparing the 24mm at F1.4 to the 50mm at F1.4 is pointless given the DOF difference .

Sorry Jim, but those figures aren't comparable, as Photozone themselves point out. For a fair view, you need to look at unsharpened output on sensors with comparable resolution. Looking at such figures, e.g., from Lenstip, DxOMark, or LensRentals (Roger Cicala) gives a very different impression. Here, for simplicity, are the results from LensRentals, which are somewhat biased in favor of the Nikon due to the higher sensor resolution. The figures are lp/ih (line pairs per image height) for center/average at MTF 50.

Panasonic Leica 25/1.4 on E-M5 (16 MP)
1.4 690/590
2.8 960/820
4.0 980/850

Nikkor 50/1.4 on D3X (24 MP)
1.4 560/500
2.0 690/620
2.8 830/750
4.0 900/830

Sources:

http://www.lensrentals.com/blog/2012/05/wide-angle-micro-43-imatest-results

http://www.lensrentals.com/blog/2012/01/the-great-50mm-shootout

If you want to compare at the same DoF (e.g. 1.4 for MFT versus 2.8 for FF) rather than at the same f-stop (e.g. 1.4 for MFT verus 1.4 for FF), fine with me. Note, however, that if you do so, FF has no noise advantage, and in some cases even a disadvantage. For example, the E-M5 at ISO 1600 beats the D800 at ISO 6400 with regard to DR (i.e., in practice, shadow noise) by approximately one stop, and the D800 would have to use two stops higher ISO in order to go equal with regard to DoF. You can't eat the cake and have it too.

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