Originally posted by Hapo I'm not sure if it was one somebody or multiple somebodies. Every time I check there are fewer lenses left. Everybody's speculating now; I wouldn't be surprised to see them leak back out into the market over the next couple of years....
Speculating is likely. But risky too.
The 645D has very tight requirements on lens quality. The lenses made for Leica's S2 have some stellar MTF curves (like border values of up to 80% at 40 lp/mm ...).
A good performer on 645D has to render good MTF (~ 50%) at 80 lp/mm rather than at 40 lp/mm as was usually required for film.
(And 50% at 80 lp/mm indeed means ~80% at 40 lp/mm ...)
So, if at all, I would speculate with top-notch 645 glass only.