Yesterday, I posted some dark-field histograms from the a7II at various ISO settings with the new uncompressed raw mode enabled. Today I’ll show you what the read noise from those images looks like, and how it compares to the CRAW lossily compressed dark field images. I looked at a 200×200 central square and examined the… [Read More]
Search Results for: a7ii ibis
a7II self-heating for long exposures
In this post, we saw a pronounced self heating effect in the dark noise of successive 30-second exposures with the Sony a7RII. I repeated the test with the predecessor camera, the a7R, and found far less effect. A reader postulated that the difference might be lower thermal conductivity between the sensor and the camera chassis… [Read More]
2 180mm lenses on the Sony a7II
The title is a bit misleading. I’ve been asked to compare the Sony 70-200mm f/4 OGG FE lens to the Leica 180mm f/3.4 Apo-Telyt-R. For this test, I set the Sony lens to about 180mm. The camera was the Sony alpha 7 Mark II, hereafter called the a7II. It was tripod mounted with a RRS… [Read More]
Heavy and light tripods with Sony a7R, a7II
For the past few days, I’ve been doing tests of image sharpness with the Sony 70-200 f/4 OSS FE lens mounted on a Sony a7R and a a7II camera. I’ve been using a really sturdy tripod — the RRS TVC-43 — and head — the Arca Swiss C1 Cube — for the testing when I’ve… [Read More]
Sony 70-200 f/4 OSS lens on Sony a7II
In the previous post, I reported on the performance of the Sony 70-200mm f/4 OSS FE lens on the a7R camera, with and without OSS turned on. In this post, I’d like to present similar results for the same lens on the a7II, with and without in-body image stabilization (IBIS), and with electronic first-curtain shutter… [Read More]