It’s look like Astro Photographers are not happy with the Sony A7R IV camera. While putting camera on longer exposure to capture night sky, due to the presence of strong noise reduction filter the A7RIV wipes out most of the stars from the scene. Take a look what Jim (Jim website) said about the camera
I’m not going to bury the lead here: the Sony a7RIV eats stars just about like the a7RIII does…except that the new behavior starts at 3.2 seconds instead of 4 seconds.
Sony should create a dedicated Star capture mode, and star trail for their camera like Olympus did years ago.
Also see – Sony A7R IV High ISO Test
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I’m sure this is only happening in JPG out of the camera. Most surely RAW users (like all professionals) won’t have this problem.