Okay. I tried the same object with the same exposure time (6x 5 minute subs), and the same camera on a much windier night with my ed80 (with .85x FF/FR) and got the result below. It would seem the noise is much more prominent for the wider field (as I expected given I had to stretch it more) although I find the noisier detail about the same (if that makes sense). The resolution seems more to do with scale given the noise from the Canon 40d. A less noisy camera (or better processing) would be more revealing I guess. Or am I seeing this all wrong!?
