Thanks for the Info about reciprocity failure, it is true that this not affect the Digital camera, sadly we have to worry about noise for long exposures.
I am sorry I did not explain myslef clearly in the last email.
what I am looking for is for some type of cheat sheet that would help figure out the digital performance in low light conditions I have manage to find a lot for film but none for Digital.
what is a correct exposure for city light or moon light or candle light at iso 100?
for example from experience I have taken some photograph with full moon and no external light sources and the required time for this is around 5 minutes, when for film is around 15 min for the same shot both at ISO 100.
with no moon you can multiply this for 2 or 3 for the same photo would be around 15 to 20 min.
you can see some examples I posted of this photos in this web site.
http://www.photoforum.ru/rate/user.php?u_id=5632
again thanks all of you for taking the time to read this and respond to it.
Rafael Ramirez Lee
> Tom P.
>
The exception to this that may be relevant to the original query about night photography is when reciprocity failure occurs. This is generally not a problem for digital bodies but a film that is rated at 100 ISO in normal lighting may well only be 50 ISO or less under low light conditions. The only way to know is to check out the data sheet for the film (I think you can download them from Fuji or Kodak's web sites these days),
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