In my gear I use a ZWO filter set (7nm) bought as part of an EFW set. I regularly observe that the autofocus of the red and green filters exhibit an HFR in the range of 0.65 to 0.72, while the blue filter rarely falls below 0.88. Also, the stars in the blue-filtered images are bloated.
In a cloudynights post I found a hint that this is a "feature" of the (blue) filter. Are there similar experiences from other people in this forum? Should I replace the LRGB filters? Are there any recommendations for my ASI1600MM?

Thanks for hints.

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