I should find a Pen-F body, for fun. What's the best value?
How about film, developing and scanning?
Regards to digital: I have more or less 50 manual focus lenses--about 20 are RF or Pen. I use them all with my aps-c nex-5. Aps-c is very close to the pen frame. There are 2 serious issues: CA with longer lenses--varies tremedously and goes away by 5.6 in nearly all cases; and corner smearing and/or colorshift with retro focusing lenses like the cv skopars.
My best 20 is an nFD 20/2.8, which is fantastic. My cv 21/4 is pretty darn nice, but shifts colors--and I suspect smears a bit in the corners. It will be very interesting to see how the Pen 20 performs.
Conrner smearing itself can come from two reasons: the sensor can't deal with the sideways light; or, the lens itself has spherical aberation; or a possible combination of both.
I now wonder if the rear element diameter also plays a roll. The pen wides have very small rear elements---my 25 is smaller the canon or cv mentioned above and shows strong SA: but neverthless I love it:
dang, need to bring that exposure up--sry
Beyond the above mentioned issues the difference between digital and film is not greater than the difference between velvia 50 and ilford 3200, and with the Pen, one could argue its less than with 35mm glass if youare using aps-c, since ther is a 1.5x crop.
I'm even more convinced of this now that I am shooting film again with my colordial. And what 90% of digital users do not realise is that ultimately, film still reigns supreme in optical performance starting at 645. Well, perhaps that new 10k MF camera can compete.
best to all