Upload & Sell: Off
Hi @BastianK and @Phillip Reeve,
I've just uploaded raw files of ZM35/1.4 + Opto 5m shots at F1.4 & infinity.
Your mentioned "midzone dip" also appears in my copy.
Compared to the center, sharpness goes lower in the area 50-80% off center, then around 90% off center, it goes higher again.
And I also see upper-right midzone is slightly worse than lower-left midzone.
I'd carefully checked my filter centering using @scrappydog's method, so perhaps my ZM35 is not a best copy...
But I have to say, even in the midzone, sharpness seems to be not worse than without PCX.
And as Guy mentioned, I also see midzone goes best at F4 or higher, whereas it is not that good without PCX below F8.
In my conclusion, there is no doubt PCX 5m improves ZM35/1.4's overall sharpness, but still have a little weakness at wider aperture.