Panasonic g85 terrible video quality

mentos77 wrote:

Interesting, I never knew what ISO is and learned from the exposure triangle too. I assumed it was a measure of how much light was allowed onto the sensor. Sounds like you may be saying it is purely an in camera digital thing like turning up the brightness on your TV?

The triangle is still valid but raising the iso with digital it is a bit like pushing an iso rated film and to get the desired results you needed to extend the mount of time the film sat in the developer in the digital world they call it gain.

I guess that makes more sense when you think how it was set for film cameras i.e. you buy 100, 200, or 400 film for low light. So the film is naturally brighter or not.

Also goes some way to explaining why there is an aperture dial and a shutter speed dial, but ISO is generally set in the menu or assigned buttons.

Edit: I just looked it up on Youtube and yes it is like having a dimmer knob for your room light. It is a purely digital in-camera thing altering the sensitivity of the sensor. Like increasing the sensitivity of a microphone, when you raise ISO you get more noise.

The noise we don't like is from the pixels not letting enough light in, but we are forcing that light to hit the sensor when we raise the ISO, so the camera guesses which color to use. Larger pixel/lower megapixel cameras like the Sony A7s 12MP have bigger pixels, letting in more light, resulting in more accurate color and therefore cleaner high ISO. Which is why people are predicting the forthcoming GH5s will have less megapixels.

I am sure most on here knew this- but maybe there are a few others like me that never really looked into it beyond ISO affecting "the sensitivity" of the sensor. Because the larger pixels create more accurate colors at higher sensitivity (ISO), this seems like it is correct to say it is a part of exposure. On the other hand I can see why some say it is not- because you are basically turning up the brightness digitally, like on your TV.