Yesterday I posted a set of pictures with the Nikon AF-S 200-400 mm 1:4G lens on the Nikon D810. The images were intended to get an handle on center and corner sharpness of that lens with a distant subject at various f-stops. I made the images for yesterday’s post at ISO 640, about a stop… [Read More]
Archives for May 2015
Testing the Nikon 200-400mm f/4
I’m trying to find a zoom lens that works well for distant landscapes, sometime stitched, sometimes not. My initial experiments with the Nikon AF-S Nikkor 200-400 mm 1:4G were unsuccessful. However, after testing the known sharp Nikon AF-S 400mm f/2.8 under similar conditions and finding blur traceable to thermal atmospheric turbulence, I was ready to… [Read More]
EFCS without atmospheric effects
Yesterday, I did some testing of the Nikon 400mm f/2.8 lens on the Nikon D810 with and without EFCS, and didn’t see much difference. I went back and looked at the MTF testing I did with the D810 and the 400/2.8, and there wasn’t much difference at shutter speed faster than 1/125 second. So I… [Read More]
EFCS and atmospheric effects
I’ve been making images like this lately: This is a 20-image stitch made with a Sony a7II and a Leica 280mm f/4 Apo-Telyt-R. I decided that I wanted to try a zoom lens, so that, when I’m not stitching, I could frame by zooming. Many people say you should “zoom with your feet” but that’s… [Read More]
A book report: LensWork publishing services
This is post eleven in a series about my experiences in publishing a book. The series starts here. I got an interesting email yesterday from LensWork, pointing me at this website: Here are the details. Isn’t that a coincidence! Just at the time when I start working on publishing a book, LensWork gets into that… [Read More]