They vignette as soon as you hit the edge of the IC. So at 5mm of shift you will get a shadow starting to show. The 28 also shows a white band long before the 5mm range is reached. It’s very evident in a blue sky or solid dark area of the image. I used to know the term for this effect but have forgotten it.Hi Paul, in practice do the HR-S lenses hard-vignette at exactly 70mm? Or rather at exactly 80mm?
More to the point, do you get dark corners if you use them on 6x6 film or can you just barely use them? (I know you're supposed to use screw-on filters on the rear ends to adjust for the lack of cover glass on film.)
I can’t answer what effect you would see on a 6x6 film.
It’s very evident on the IQ160 54x44 sized sensor.
HR-S lenses were designed for the smaller sized smaller pixel pitch of digital sensors.
With the 28mm HR I quickly gave up shifting pretty pointless due to the IC.
Paul C