The recently released and long-awaited Sony a7S III marks a significant step forward in terms of camera technology, bringing some remarkable dynamic range and 10-bit 4:2:2 internal recording. As the camera falls into the hands of more reviewers, a question remains: does it have dual gain ISO?
Josh Yeo had a few days to play with the camera last month and just had chance to put his thoughts together in this video. Like Gerald of Gerald Undone, Yeo was so impressed that he’s decided to invest in a pair of a7S IIIs, as the camera is an excellent fit for his line of work. Be sure to check out the video in full to see what gets Yeo so excited about this new camera and which features he didn’t even realize that he needed.
Not many users have had a chance to play with the camera for more than four days, and there’s still something of a mystery as to what happens when you flick over from ISO 12,800 to 16,000. As seen in Gerald's extensive testing (check out 18:43 in this video), there’s a significant drop in noise that is yet to be explained. If there is dual gain ISO, why isn’t Sony shouting about it as part of its marketing for the camera? Yeo suggests that there might be a different explanation, but you’d still expect something to appear in the camera’s documentation.
What are your theories? Be sure to let us know your ideas in the comments below.