Archives for February 2014

I’ve been testing a Cognisys rail for stacked macros. Since I’ve been doing the shutter shock testing, I thought I’d see if the rail made things worse, and, if so, in what way. I set up this gear: Zeiss 135mm f/2 APO Sonnar ZF.2 on a Nikon D800E, RRS D800 L-bracket, RRS clamp, Cognisys 200mm… [Read More]

I’ve had interest in comparing a normal lens on the D800E with the Sony a7R/Zony 55 results. I set up this gear: AFS Nikkor 58mm f/1.4G on a D800E, RRS D800 L-bracket, Arca Swiss C1 Cube, RRS TVC-44 legs. Release in mirror up mode, with a programmed 5 second delay between mirror up and shutter… [Read More]

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]

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]