Archived posting to the Leica Users Group, 2010/10/30
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]> Alastair? > > In answer to your question about the low noise level in bright-light > exposures at ISO 2500, here's my suspicion: The amount of noise in a given > exposure depends on a number of variables, one of which is the duration of > the exposure. Perhaps at ISO 2500, 1/1000th at f/4 means noticeably less > noise than 1/60th at f/16, despite the fact that the number of photons is > the same in both cases. > > I'll do a comparison and post it. > > ?howard That's certainly a start. Noise is random, and may well be time dependent. This does not seem to explain why Doug's "trick" with the DMR seems to work. Choose an ISO say 200 and expose as if its 400 (ie -1ev) and the results are better than choosing 400 to start with, though the shutter speed would be the same. There is more to this. Why would one sensor be "less noisy" than another made by the same manufacturer. ie Sony sensors V Nikon results. If you process the RAW images without "interference" will they look the same. I suspect there is a "fiddle" even with the RAW images. Cheers Alastair