Quote:
Originally Posted by jsmoraes
Gain unity = 1
Some people says that gain idea is a flawed concept. http://www.clarkvision.com/articles/...mance.summary/
The most curious is that many people talk about the response of sensor used by Canon. And they are talking not only about sensor, they are talking about the sensor with the electronic Canon inside the camera.
|
Regarding unity gain...I've read and understood the many articles on the subject including the one you posted and I don't agree 100%. Just my assessment. In an ideal world, I'd rather have the raw signal with no digital gain applied or any other monkey business as we don't know what else is happening to the signal, but since none of the manufacturers of DSLRs wish to give us that we have to take what we can get.
However...unity gain or thereabouts is only good under the right circumstances. As I said, you have to try out the options under your own conditions and see what works best for you - which is what I believe you are doing
Personally, I find that ISO1600 works best under most circumstances, since it seems to be a sweet spot between signal and noise. In cool conditions (5C or less ambient) then the darks are practically clean from my camera. Under warm ambient conditions it may not be ideal because of the red snow storm that appears on images. But with the shorter exposure times it is possible to take a larger number of subs and reduce this noise with stacking. Lower ISO is certainly less noisy, but also requires longer exposures. One of my experiments last summer was taking 50x 2 minute subs of M42 to capture the faint nebulosity from a dark site and it was quite effective. It obviously isn't ideal since it was summer time and therefore warm evenings and noisy individual subs, but I take what I can from the equipment I've got
