Three or four weeks ago I received a Metabones 1.26x expander for Nikon F-mount lenses on Fujifilm G-mount cameras. This is an adapter with glass — and quite a bit of glass, at that — inside. It increases the focal length of any lens attached to it by a factor of 1.26, and expands the… [Read More]
Camera differences in Adobe Color Profile
In the last post, I showed that, at least in the default general-purpose settings, Lumiriver Profile Designer did not do a particularly good job of producing the same color from raw files from three different cameras, even though with the reproduction defaults (except for 2.5 dimension LUTs) it did pretty well with at least one… [Read More]
Calibrating out the camera when making color profiles
In this test and this one, I showed that you could get the colors of developed files from the Sony a7RIV, the Nikon Z7, and the Fujifilm GFX 100 reasonably close if you used Lumariver Profile Designer, and the reproduction style. The a7RIV and the Z7 were remarkably statistically accurate and even closer to each… [Read More]
Sony 20/1.8 vs Batis 18/2.8 — Siemens Star
I’ve been asked to compare the Sony 20mm f/1.8 to the Zeiss Batis 18 mm f/2.8. Here’s a test with both lenses mounted on an a7RIV aimed at a low-contrast Siemens Star at about 8 meters for the 20, and about a meter close for the 18, with the star in the center and the… [Read More]
Sony 20mm f/1.8 focus curvature
Roger Cicala has come up with a quick and dirty focus curvature test that I’ve used before. Just make a photograph of a flat textured surface at an angle well away from the image field focus plane, then bring it into Photoshop and invoke Filter>Stylize>Find Edges. It works great at long and near-normal focal lengths:… [Read More]