Thank you David (and Mike).
Yes, I've processed in 16 bit tif and saved 8-bit jpg (I think - must admit that there are heaps of concepts and details that I really do not understand or know very well).
Of course, this was a first atempt with the new camera. I hope to do, say, 2 hours in total on this. The problem, however, is that the weather is, what do you say, crappy! And it will stay so for another week, at least.