Archives for November 2016

We have seen here and here that the Sony a7RII running firmware 3.30 spatially filters raw images prior to writing them to the flash card at shutter speeds slower than 3.2 seconds.  There has been an Internet report that some Nikons did something similar, but that they could be tricked into not doing it by… [Read More]

Yesterday, I reported that the Sony a7RII with firmware 3.30 performs low-pass spatial filtering at base ISO for exposures longer than 3.2 seconds. Today, I’m going to look at some other ISO settings. What I will show is spectral analyses of the raw red channel of exposures of the back of the body cap. Shutter mode… [Read More]

I have previously reported that the Sony a7RII performs low-pass spatial filtering on raw files under some conditions: bulb and high-ISO exposures. This behavior is now often called the “star-eater” algorithm, a reference to its degradation of some astro images.  Recently, an astrophotographer posted some images here, and claimed that the star-eating behavior affected timed exposures… [Read More]

This post is part of a series about some experiments I’m doing combining space and time in slit scan photographs. The series starts here. Sometimes with the slit scan images that I’m doing, the pattern of cloud shadows on the hills changes very rapidly, creating vertical striping patterns that are visually odd (in a bad… [Read More]

This post is part of a series about some experiments I’m doing combining space and time in slit scan photographs. The series starts here. Because using a raw workflow is too cumbersome with tens of thousands of images per setup, I’ve been using Adobe RGB JPEG images. There’s an issue with those if you push… [Read More]