This is the ninth in a series of posts on the Sony a9. The series starts here. There have been reports of Sony a9s shutting down because of internal temperature buildup. There are many camera modes that can affect power consumption, and I hope to eventually be able to do the fixturing to measure that… [Read More]

This is the eighth in a series of posts on the Sony a9. The series starts here. Note: this post has been extensively revised to correct modeling errors that result from a series of anomalies in the a9 photon transfer curves. To get around this problem, I had to prune out the data in the problem… [Read More]

This is the seventh in a series of posts on the Sony a9. The series starts here. In the last post, we looked at the pixel response non-uniformity (PRNU) of the Sony a9, and found that there were some periodic components, which are usually more visually disturbing than random ones. Now I’m going to show you… [Read More]

This is the sixth in a series of posts on the Sony a9. The series starts here. Here’s how I measure the pixel response non-uniformity (PRNU) of a camera. Set the camera up aimed at a white target. Light the target with a pair of LED panels set to 5000K.  Defocus the lens; I just put the… [Read More]

This is the fifth in a series of posts on the Sony a9. The series starts here. The biggest news about the a9 is the electronic shutter. Sony says it’s fast, but they don’t say how fast? Is it only half-fast? (Sorry, couldn’t resist.) The electronic shutters on previous Sony a7x cameras have scan times… [Read More]