Archives for 2015

In the previous post, I noted small (sub LSB) differences in average dark field images from compressed and uncompressed raw files from the Sony a7RII. This post repeats the testing and plotting for the a7II. I took a look at the mean values of a 200×200 central square of the same raw dark-field images that… [Read More]

Jack Hogan, in a comment to an earlier post on the rms noise values of uncompressed and compressed Sony a7rII dark-field images, wondered if there was digital multiplication going on, and, if so, would the mean values be affected. I took a look at the mean values of a 200×200 central square of the same… [Read More]

A few days ago I posted dark-field histograms from uncompressed files made with version 2 firmware running on the Sony a7II. Yesterday, I posted compressed and uncompressed read noise and engineering dynamic range plots for the a7RII running version 2 firmware. Today’s post is of dark-field histograms from the a7RII, both compressed and uncompressed. The… [Read More]

Yesterday, I posted a comparison of uncompressed and compressed read noise and engineering dynamic range for the new version 2 firmware on the Sony a7II. Today I’ll do the same for the a7RII. I looked at a 200×200 central square and examined the red and blue raw channels, and one of the green ones. The… [Read More]