LensRentals has loaned me a Hasselblad XCD 135mm f/2.8 lens for testing. Today I tested with the matched 1.7X teleconverter (TC), and looked at the out of focus (OOF) point spread functions (PSFs) using the mechanical shutter. I focused the lens to minimum focus distance (MFD), set the aperture wide open, and aimed it at a LED mini flashlight about 25 feet away.
Looking at the OOF PSFs off axis, in a composite image:
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