| Joined: | Thu Apr 19th, 2012 |
| Location: | United Kingdom |
| Posts: | 4424 |
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Having read an article in AP about the impact of noise on a camera's dynamic range and hence its tonal range I was surprised!
After years of using digital cameras I never realised, the longer the exposure...the less noise. If fact, if asked, I would have said the reverse.
It's logical when you consider exposure time shifts the signal to noise ratio in favour of the former....but I had never considered the significance of this.
Somehow I have always interpreted the higher than expected noise levels of photos taken at low ISO, in dark interiors, to be due to the necessary long exposures. It now seems that its nothing more than underexposure.
I think?:baffled::baffled::baffled::baffled:
Have a read at this....
http://theory.uchicago.edu/~ejm/pix/20d/tests/noise/noise-p3.html#bitdepth
PLEASE NOTE
I have only read a couple of sections...I need a rest to digest whats been written...then I will continue further down.
This note is in case some more scholarly person reads to the bottom before I do.... and finds a contra argument.
Oh Lord...just read some more while the wife is having root canal. Not sure I wouldn't prefer to trade places...as this is more confusing and head banging.
Last edited on Fri Dec 7th, 2012 06:24 by Eric
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Eric