Search Results for: star eater

This is a continuation of a series of posts about bokeh and lenses that are designed to optimize it. The series starts here. In this post, we looked at the bokeh of the Zeiss 135 mm f/2 Apo-Sonnar ZF.2, the Nikon 135 mm f/2 DC-Nikkor, and the Sony 135 mm f/2.8 STF with parts of the… [Read More]

This is a continuation of a series of posts about bokeh and lenses that are designed to optimize it. The series starts here. I set up one of my regular bokeh-evaluation scenes, and photographed it with the Nikon 135 mm f/2 DC-Nikkor and Sony 135mm T/4.5 (f/2.8) STF lens. I made images with the DC-Nikkor both… [Read More]

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. The camera did similar filtering for bulb exposures in earlier releases. A DPR poster earlier proposed that the algorithm Sony used was the… [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. 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]