The second big upgrade is in ISO. I am one of those people who will shoot up to 25,000 ISO if I need to to maintain my shutter speed and aperture where I want them. Maybe this is an old-guy film-shooter thing, but changing ISO still seems like a miracle to me, and it’s my favorite thing about digital photography—when it works. With the A7V, I was completely comfortable pushing ISO as high as 32,000. With the noise-reduction algorithms in postproduction software these days, the images still look great…

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