A77: why long lenses seem to be so out resolved?

Started Feb 15, 2014 | Discussions thread
craig66 Senior Member • Posts: 1,249
Re: A77: why long lenses seem to be so out resolved?

Michel J wrote:

Anyway, it does not reflect a tangible explanation of tests from the same camera (A65): why the Sony DT 35mm F1.8 SAM have the same score >>> of the Sony 35mm F1.4 Gwhereas in reality, there is no noticeable diffrence with the Sony DT 18-135mm f/3.5-5.6 SAM at 35 mm. And when the kit-lens itself DT 18-55mm is rated higher than the last one!

Sony 35mm F1.4 G 13 p-MP (DxO T score: 21)

Sony DT 35mm F1.8 SAM 13 p-MP (DxO T score: 21)

Sony DT 18-135mm f/3.5-5.6 SAM 7 p-MP (DxO T score: 12)

Sony DT 18-55mm F3.5-5.6 SAM 9 p-MP (DxO T score: 11)

DXO has some magic formulae to calculate the scores and p-MP. IMHO the value of DXO is looking at the measurements. If you look at the measurements, then the 35 DT @ f4 is easily better than the 18-135 @f4.5 and somewhat better at all apertures.

The 35mm G is no better than the 35 DT from f2 onwards and very soft wide open. In fact, the DT lens looks better towards the edges. The G is overpriced.

As far as I can see, though the method of calculation is opaque, in the the cases above the scores are justified. The primes deliver better sharpness than the zooms which is what you would expect and they are much faster.

 craig66's gear list:craig66's gear list
Sony RX100 II Sony a77 II Sony DT 55-300mm F4.5-5.6 SAM Tamron SP AF 200-500mm F/5-6.3 Di LD (IF) Sigma 150mm F2.8 EX DG OS Macro HSM +11 more
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