Thank you all for a stimulating set of comments! The solution is clear now: if I am to explore 67 I should get the full set
with a couple of lenses designed for Pentax itself. Which models have TTL metering built in? What is the difference of
Pentax 67ii? Is it worth it? I am always thinking that painters (I work in oils too) have a different degree of freedom when
choosing a format for a future painting: it could be 50x40, 90x90, 150x100 or anything you want it to be. In photography,
the limits of the medium, the format that the camera has is the factor that determines the dimensions of the final piece (I
am a purist and do not really like cropping). The only way to try it is to try different systems. For me there is much more
value in choosing the right format for a project rather than cropping in post-stages. Why didn't anyone to figure out a
program enhancement for the Nikon D300/D800, which could set the dimensions: 6x6, 3x4, 6x7, 6x9 right at the start? It
would have been revolutionary! I tried the digital Hasselblad and was disappointed a bit seeing that the matrix isn't
square...