You’re in a bind; you’re in a dark place and you’re trying to find the ISO button on your camera. What do you do? Some folks end up pressing buttons until they get to exactly what they want. But if you’ve got a camera with a dedicated ISO button, then you’re a bit more in luck. For some time now, camera companies have made their buttons have a little bulging dot on top of their ISO buttons. So when you’re in the dark, you’ll be able to feel for exactly what you need. Canon and Nikon have both done this for years and on the newer Panasonic GH5s, the ISO button has perforations on it while the white balance button is more rounded out. Once the photographer knows what button does what, they’ll be all set to shoot.
If you have a camera with buttons that are programmable, you’re not in as much luck. Or if you’ve got a camera with a dedicated ISO dial, you’ll need to look at the screen or the dial itself. But in these cases, the function buttons can help if you set them up in a specific way that you’ll understand.