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Message: <blockquote data-quote="bartjeej" data-source="post: 396543" data-attributes="member: 488">a7R IV is almost as good as the a7S III for high ISO results. They are both Dual Gain sensors, and the "walls" between the extra pixels on the a7R only "bounce" a few percent of the total photons collected by the sensor.For serious video work, the lower MP count of the a7S makes for less rolling shutter and less processing power required, so also less heat during longer record times.On the other hand, the a7R IV, having more than 4x the pixel count of the a7S, and can be downsampled to have a full color block (2 green 1 1 blue pixels) for each of the a7S's single-color pixels, eliminating the need for further Bayer demosaicing at 4K output.  Additionally, with 4x the number of pixels, any lens gains 2x digital zoom before you have to start interpolating.My guess is that for journalistic work, the downsides of (somewhat) more rolling shutter and more required processing power are outweighed by the additional flexibility of  being able to take high MP photos and use "lossless" (actually "interpolation-less") digital zoom. Especially since journalists are expected to be able to do both photos and videos more and more.DPReview had an interview with the AP guy behind all this; he said some video guys will get the a7R, and some will get dedicated video cameras (so even more dedicated than the a7S):<h3>'Do you have a sense of the ratio of a9-series to a7-series cameras that you’re going to be onboarding?</h3>The vast majority of the stills photographers will get a9 Mark IIs. We will get some a7R IVs for the videographers, and a couple for some of our entertainment shooters who do a lot of portraits. But the standard kit will be an a9 Mark II.On the video side there are six different cameras that might become part of the kit, from broadcast cine cameras all the way down to small palm-sized cameras, depending on the assignment. But we have six cameras spec’d-out on the video side.'[URL unfurl="true"]https://m.dpreview.com/interviews/2999935759/interview-we-talk-to-ap-director-of-photography-about-switch-to-sony/1[/URL]</blockquote>

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