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I have a toy fisheye conversion lens (pic relates to this) and because it's cheep it's soft and distorted as fuck so I need high ƒ-stops to get as sharp a pitcher as possible. the effects of diffraction are negligible compared to the fisheye's fisheyeness so I crank it as high as I can.
It's a fun lens. Photography is fun. I suck tho but in a blissful retard kinda way.