Archives for August 2015

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.    

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]

One of the things that I usually do with ISOless cameras is make a series of images of my bookcase that have all received the same exposure, but with different in-camera ISO settings. I then use the Exposure control in Lightroom (Lr) to push the “underexposed” images by the amount that they were “underexposed”. I… [Read More]

We’ve seen in previous posts that the Sony a7RII does wonders for the color casts that beset the a7R when used with short, pseudo-symmetric rangefinder lenses. Since the sensor stack is still the same thickness, I don’t expect any improvement in corner smear, but it’s certainly worth testing. I attached a Leica 24mm f/3.8 Elmar-M… [Read More]