Archives for 2015

A few days ago, I determined that shutter speeds over 1/1000 second using electronic first curtain shutter (EFCS) on the Sony a7RII with a Zeiss 100mm f/2 Makro-Planar ZF lens showed some exposure unevenness, and shots over 1/2000 second showed a lot. Sony warns in the a7RII manual that exposures using EFCS made with non-native… [Read More]

In this post, I’ll present pairs of images made with the a7RII on both sides of the conversion gain transition, corrected in post as explained here. The base ISO is 12800. The difference in noise level is apparent.  

In the previous post we looked at color shifts in pushed Sony a7RII images, with push amounts from nothing to +5 stops, which is all you can get with the Lightroom Exposure control. See that post for the details of the conditions under which the images were captured. Now, I’d like to present blowups to… [Read More]

This is a continuation of the testing started here, but with a base ISO two stops higher. For review, here is the test protocol. I set the a7RII on a tripod with the Zony 35/2.8 FE lens attached, determined that a not-very-aggressively-ETTR’d exposure at ISO 12800 was f/8 at 1/125 second. Varying nothing but the… [Read More]

In this post, I’ll present pairs of images made with the a7RII on both sides of the conversion gain transition, corrected in post as explained here. The conversion gain change seems to take place with no material color shifts. Looking closer: We can see that the ISO 500 image is noisier.