actually I realized that the nikon 10.5mm is for me the best choice in combination with the R1
than I'll se if to keep or sell the nikkor 16mm
about the HDR the problem is the time it keeps in post processing , if you have an interior with 5-10
panos is a big difference if you have 4 or 6 shots around ...
Anyway you both gave me a great help .thank you very much!