osmonauta
Second Officer
Hungary
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You can find a lot of tutorial/instructional videos on ISO usage on YouTube. I'd recommend watching a few (cuz there are literally thousands).
If it's really bright and sunny, yes, you can use Auto. But if you shoot during sunset or even in the evenings, I'd be careful with the Auto setting - depending on what you want to achieve.
For example, I'd definitely not recommend using Auto ISO if you want to do a Timelapse during sunset, where in the beginning of the video it's still bright (because the sun is still up), but later it gets dark and you see the city lights, etc (or whatever). For a timelapse like this, when I left it on Auto, the bright part (when the sun was still up) was fine, but when it changed into dark, the footage became extremely grainy as the camera cranked up the ISO to compensate for the darkness.
When I did the same timelapse using ISO 100-200, the footage was still very clean even when the scene changed to dark and you could only see taillights of cars, streetlights, lit buildings etc ,because the camera left the ISO between 100-200. But in such scenes you could set it to 100-400 or maybe even 100-800 depending on how much light will have around you after the sun goes down.
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