I packed a polarizer but neglected to use it. I have not used polarizers in the rain, but I think it is a very useful suggestion for the next opportunity
Are you noticing any purple fringing with the Zeiss 21 on the M 240? I would be interested in your experience with this combination. I have experienced some fringing using the Zeiss 21 and M 240 - but interestingly the fringing seems to occur only when there is non-complex, somewhat neutral grey subject matter. Nice image BTW!