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]
How fast is the Sony a9 electronic shutter?
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]
Sony a9 eats stars
This is the fourth in a series of posts on the Sony a9. The series starts here. I’ve been asked to look into the digital lowpass filtering in the Sony a9 as a function of exposure time, to see it it has the same “star-eater” filtering beginning as 4 second exposures that was introduced to… [Read More]
Sony a9 EDR vs ISO setting
This is the third in a series of posts on the Sony a9. The series starts here. I made a series of dark field images with the raw format set to uncompressed, and the mechanical shutter set to electronic first curtain shutter (EFCS). When I used the continuous drive mode, I set the rate to… [Read More]
Sony a9 precision
This is the second in a series of posts on the Sony a9. The series starts here. On the a7x cameras, the quantizing precision of raw files is 13 bits in compressed raw mode with the mechanical or EFC shutter and the drive mode set to single shot. If you use the electronic shutter (called… [Read More]
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