thanks a lot, snaprat and hobb3

Just seen this! It is absolutely amazing. Congratulations.

thanks, doug and Ashwin,
I used the 21mm C-Biogon a lot - before I got the 18mm Super Elmar :-)
for B&W the 21mm C-Biogon is ok. and for architecture it is ideal, as it has NO distortion!
BUT: the color shift is hardly compensated by Cornerfix, and I read somewhere, that Zeiss does not recomend it for the M9 -
but, as said, for B&W it is great value for money!

Very effective composition and tonality to show off extraordinary architecture.