osv2 wrote: NJPhotographer wrote: osv2 wrote: NJPhotographer wrote:
That's why I'm saying DXO's "22" sharpness score for both lenses is not useful.
agree with that, you are obviously looking at the wrong dxo metric.
you should be comparing sharpness at each aperture setting, instead of the overall "22" metric, which is an average of all sharpness measurements, taken at all aperture settings.
the averaged-out "22" numbers are similar because by f/4 the sharpness measurement profiles are close to each other, and by f/5.6-f/8 they are identical, for both lenses.
It may be the "wrong" DXO metric, but it's the metric DXO chooses when ranking lenses by sharpness.
dxo didn't make you compare an averaged metric to a specific aperture measurement, you did that all on your own, lol
Open DXOMark's Lens Database, and rank lenses by Sharpness. Then you see: it's based on that Sharpness score. And you see: the RF 50mm ranks way down on the list, same as the very old 1993 EF 50/1.4. That's misleading. We often see that score reposted, as we did in this thread. In that ranking, the new RF 50 looks like junk, equal to a cheap old lens. That's how DXO is set up. I didn't set it up that way.
How misleading is DXO? For evidence, just look at raminolta's post above, stating "DXOMark has so far reviewed two RF lenses. Canon RF 50mm f/1.2L USM on EOS R scores 22 in sharpness on DXOMark. Canon RF 28-70mm f/2L USM. Sony FE 24-70mm F2.8 GM scores 28 in sharpness on A7r ii. The Sony Carl Zeiss Planar T* FE 50mm 1.4 ZA scores 41 in sharpness. In other words, the Sony FE lenses are better than the Canon RF lenses."
So that's just one FredMiranda forum member accepting the "22" sharpness ranking as authoritative and reliable. Likely many photographers are misled the same way, thinking the RF lenses are as sharp as 1990s junk. Why is DXO set up to mislead? I don't know.
If someone looks up the aperture comparison chart, which you helpfully posted, they find that the RF 50/1.2 is much better than the old EF 50/1.4. But that's not how the lenses are ranked by DXO.
Jul 25, 2020 at 02:50 PM
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