I have noticed what appears to be excessive dust when shooting in certain situations.
I've cleaned and swapped out multiple lenses, and found the same results, so I'm assuming it's on, or in the Metabones speedbooster, or the sensor. Both of which I have cleaned as well as I can, but the dust in the image seems excessive. I've noticed that BMPCC4k has a filter of some sort in front of the sensor. Could the dust be under the filter and on the sensor itself? On other cameras I've noticed dust spots when on the sensor directly, will be noticeable on a clear blue sky. But these only appear when shooting into the sun like this and only on the sun's rays:
Which leads me to believe that the dust is not on the sensor. Is there some way to figure out where the problem dust is?
I have tried multiple focal lengths and at each end of the focal range and still they appear, but I think they are vaguely more defined when focusing as close as the lens can go.