[Hinoki]

Dear PZ



I tested Zeiss Vario-Sonnar T* 16-35mm f/2.8 ZA SSM (Sony SAL-1635Z) on Sony A850 but got a big difference to your result, http://www.opticallimits.com/sonyalphaff...ff?start=1



My testing environment:

Dark room, 1000 lux, 5000 K

Camera settings: standard, contrast+0, saturation+0, sharpness+0, brightness+0, DR: off

Image settings: JPG (fine), ISO 200

Shot on a tripod, AS: off, self-timer: 2 seconds



I've read your description on your website "All PZ sample images are taken as RAW files and converted via Photoshop ACR (default settings without automatic image correction and contrast set to 0)".

But when I analysed with RAW file or RAW converted with Photoshop CS5, the results are quite the same as the JPG file.



The other main difference is that I used a SFR chart as http://store.imatest.com/catalog/product...st-charts/ with 10:1 contrast ratio.



Could you please give me some comments if you are available ? Very appreciate your help, thanks!





BR, Hinoki

Attached is my result:

[Klaus]

This sentence in the FAQs is outdated by now - sorry for that. The text is several years old by now.

ACR is only used in a sub-set of our tests. Even so "ACR" doesn't tell you much because there are substantial differences between the ACR versions. Using defaults settings it was, I think, ACR 3 that produced the highest LW/PHs.

We are selecting both RAW converters and conversion various parameters on a per-camera basis by now. So for the Alpha-Tests we are not using ACR for instance.

The exact procedure will not be disclosed - this will just lead to endless discussions about setups and sample variation.

Frankly - I've got a life.