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I have read that Canon speaks of a "Sweet spot" in sensors at 20 mpx.   Can anyone defend that statement with a discussion or with photo to show it?  I am considering the R6 but wonder about the reducted Mpx of the sensor when the R5 has more. 
When taking HDR, what advantage does different F stop values offer. I seem to be able to set values and the results look the same.  When do I use a value of 1 vs a value of 3? 
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