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Thank you XKAES and Pieter for responding to my query. Since my post, I figured out what I was doing wrong, and now I am getting more predictable results. To answer a few questions, I am using a Sony A7R5, and am aware that it is ISO invariant, however at least for what I've tried, there are limits to how much you can "push" exposure in post. I am doing some night/astrophotography and when I set iso to 400, and increase exposure in post, I get more noise in dark foreground areas than if I use a higher iso in camera when I increase exposure 4 stops or more. I wanted to do iso bracketing so that I could further compare the results and choose the settings that gave me the best results. I had hoped that I could set the minimum iso to 320 and take 3 or more images at 2 stop increments, but I now doubt that's possible. Since the camera is choosing iso based on the light it detects, it may or may not start at 320. Any thoughts or suggestions would be appreciated. -
Thank you @Cameratose. I have tried Shotcut and it seems I can work with the video. I still don't understand why this works and yet iMovie does not. But happy to have a work around and I will keep learning. Thanks for your help. -
Out of pure curiosity: why would you want to shoot a bracket using ISO as your means to control exposure? Sony cameras are virtually ISO invariant (save for the second gain step), so raising ISO in camera or in post-production yields nearly identical results. Most people shoot bracketed exposures to gain detail in over- and underexposed areas, but when you use ISO as your exposure variable, you might as well just create the bracket in post by raising/dropping exposure. You don't gain any dynamic range that way.
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