yeh if you are using an exposure of > 1s, I imagine the fps setting goes to "auto". If it was a better user interface, it should probably disable the controls or give you some error message if your fps and exposure don't make sense..
eg: You can set 30fps with 1/15s exposure.
I imagine the camera automatically does 1/30s exposure, but the interface still says 1/15s.
If you set 15fps, click "auto" for exposure and then click auto OFF again, it will give you the pre-determined exposure, which is usually 1/fps.
For long exposures, I guess it ignores the fps completely.
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