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| p.113 #1 · Sony RX1 FF Mirrorless (fixed lens) |
I shelved plans to acquire Leica's very good 35/2 Summicron (~$1000), to be used for groups and close work, when I saw the quality of images here at FM and at getdpi, some of which just take your breath away. Now, because quite a lot people don't either see it themselves or lean heavily on the measure sites' views, a small quote from DxO via the Sony rumour site:
"DxOmark published the RX1 Zeiss lens performance test. And they write: “ Its optical performance is outstanding, and particularly noteworthy for its consistent sharpness and homogenous imaging across the frame. With excellent image quality at maximum aperture becoming outstanding at f/2.8 and on, the Zeiss Sonnar T* 2/35 is likely to become a classic, against which all others are judged. Of course the lens can only be obtained with the purchase of the RX1, a camera that is not entirely without its own quirks and shortcomings. In spite of this, if you have the money to invest, then close to perfect imagery is assured.”
And for all these people that do think the RX1 is too expensive read this: “With a high overall DxOMark score of 33, the Carl Zeiss Sonnar T* is a superb performer optically. That score puts it comfortably ahead of the $1,850 manual focus Carl Zeiss Distagon T* 1.4/35 (35mm f/1.4) on a Nikon D3X, which achieved a DxOMark score of 30.”
Are DXO lens tests gaining credit? They used to give very strange results.
Anyway, we need to look beyond the total score and to the individual measurements.
If we take the short cut and only look at the 5 sub-categories on the front page, it is clear that it gains score mostly from high sharpness, and some from low vignetting. Transmission is not measured. Do we know how they got around that? Did they give it 100% score for transmission? If we look at the weight of the bar graphs, it looks like that is the case.
And the "sharpness" is really system resolution. Put any lens on a higher resolution sensor, and the score jumps up. Or the other way. The Canon lens suffers in the comparison because it is used on a 21 Mp sensor not 24 MP. If you really want resolution you should start with the highest resolving sensor possible and then select lenses.
Further, in one (for me) important metric, chromatic aberrations, the Canon 35 F2 IS is twice as good.
So, the total score doesn't really say much, and even worse, it may actually be cheating in this case (transmission).