When I listed all the things that could affect the ISO 12233 sharpness testing here, I didn’t list exposure. Not because I was sure that it didn’t, but because I just didn’t know. I figured that it probably would, since exposure affects resolution in the computer-mediated testing regimes. Long-term readers of this blog are no… [Read More]
Testing the Zony 55 with the ISO 12233 target
I’ve had some interest in going back and looking at the Sony/Zeiss 55mm f/1.8 Sonnar (from now on called the Zony 55) on the Sony a7R. I am happy to oblige. I’ve changed the test regime a tiny bit. Rather than use a variable neutral density filter to adjust the light levels at the sensor… [Read More]
Ameliorating Sony a7R shutter shock
Joe Holmes just posted a good article on how to deal with the Sony alpha 7R shutter vibrations. Joe has gone to a lot of trouble and applied some really inventive thinking to come up with his fixes. His glass is fuller than mine in that he sees acceptable results as reachable over a broader… [Read More]
More testing of the Sony a7R with the ISO 12233 target
This is a continuation of applying the new shutter shock testing regimen first proposed and used in the last post this time to the Sony a7R and another 135mm lens. The reason there was no post yesterday was that I made some error – I’m still not sure what – that made some of the… [Read More]
Testing the D800E with the ISO 12233 target
A couple of months ago, before I got started on the Sony a7R Odyssey, I was looking for a way to compare a photograph of the ISO 12233 target made with electronic flash to one made with a continuous light source. The idea was to use the electronic flash to find out what the target… [Read More]
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