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Analysis: The Sony a7R III is still a star eater

We sent some files to our friend Jim Kasson for analysis, and he confirms that the Sony a7R III is definitely still a Star Eater, despite several claims to the contrary that have been published online over the past week.

요약하자면 A7rIII바디가 star eater issue(별을먹는지우개이슈)가 일부해결되었으나 아직도남아있다라고하네요..만약당신이 astrophotographers라면 다른바디(D850같은)를선택하는것도 고려해보라네요..

Looking at Kasson's graphs, one can clearly see the noise reduction kick in near Nyquist in Kasson's energy plots. Indeed, in our own shots of the stars with the a7R III and latest a7R II (firmware v3.00 and above), our final files only show stars that are larger than one pixel with a few neighboring pixels: suggesting that smaller stars are indeed 'eaten' or dimmed due to a spatial filtering algorithm.

This is a missed opportunity for Sony, and something dedicated astrophotographers will want to consider when deciding between the a7R III and other options that don't have this same issue (a Nikon D850 for example). Other photographers happy with the number of stars still in their shots simply won't care.

We'll drop in one of our sample photos shortly for your pixel-peeping pleasure. But for now, we can say this with confidence: while a lot of stars still survive 'Star Eater', the a7R III continues the trend of noise reduction that dims or erases small stars at exposure longer than 3.2s.