Royce said:Why do you think that the lowest ISO of 50 is good compared to 200? Lower ISO means you need more light. Or in other words, is good in well lit situations where you want to get longer exposures. But in poorly lit situations it's not as good. You can always decrease the light with an ND filter (ie. to get the same effect of ISO 50 when using ISO 200) but you cannot increase it (without artificial sources - ie. flash). I'd take 200 over 50 anyday.
erm... not too sure on this... wat abt the noise factor?