Yup, I did that on my Fotodiox tilt/shift and no-name Pentax 645 adapters. Except on those I did it on the GFX side to avoid potentially screwing up the spring/release portion of the mount. The difference on a Pentax 2 ring zoom is really obvious. With the mount short if you turn the zoom ring you go out of focus. The closer the adapter is to the proper length the less focus shift occurs when you zoom.
On the Novoflex I will have to try and shim it on the Leica side.
Shawn
Don't you run the risk of introducing skew when shimming the adapter?
Anyway as I mentioned earlier, maybe shimming would help greatly when adapting to a sensor with thin cover glass like the Z-mount or a thin-sensor modified A7 variant. But on the GFX with its thick cover glass, shimming is a wasted effort if your goal is IQ at infinity.
But since it sounds like you may shim your Novoflex for M to G-mount, please test before and after for infinity edge and corner sharpness and close distance for corner smearing. I guess test it with a floating element lens like the 50 Lux or CV 35/50 APOs.
Sep 08, 2021 at 08:47 PM
Previous versions of highdesertmesa's message #15702757 « Adapting Lenses to the Fuji GFX »
