Hi,
I don't argue your point. This is what Mark wrote:
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"All images were shot with an Alpa SWD focusing on the groundglass with my good old eyes. I used the Rodenstock 100 mm APO HR lens at F/8 which is very close to its optimum aperture. The files were converted to TIFF in the latest version of Capture One with no adjustments and no sharpening. The files were then opened in Photoshop CS4 and enlarged for the attached screen shots.
Conclusion: The Achromatic back definitely has more resolution than a standard P45+ back. Compared to a P65+, however, the Achromatic back looses, but not by much.
You need to look carefully, and of course I have the advantage of the original files, so if you cannot see it in your computers, you will have to trust me that the P65+ has slightly superior resolution to the Achromatic back. I would say that the resolution of the Achromatic back is about 2/3 of the way between a standard P45+ and a P65+.
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I have personally made comparisons between the standard P45+ and the P65+ on the Phase One 645 camera with Phase / Mamiya lenses. Although the "look" of the P65+ is much more pleasing, with better microdynamics, better color shading/color saturation and better dynamic range, when using the Phase One camera, I can see no difference in resolution between the two backs.
On the other hand, when I use either the Alpa or the Linhof with HR lenses, there is a very noticeable difference in resolution between a P45+ and a P65+.
It all fits together. Hurrah for the laws of Physics!"
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The sample from Dr. Klaus shows some jaggies on the hands of the clock. Dr. Klaus also point out the "black dots" on the "tomato soup can" being more visible on the achromatic back. Quite visible in the samples.
Best regards
Erik
Erik,
First, we cannot include the P65+ in any comparison with the Achromatic+, since the sensor is different with different size pixels. It is the direct comparison of the P45+ and the Achromatic+ that proves wrong the claims made by Bart van der Wolf in this thread.