no but the higher the iso the less infomation is recorded due to noise reduction they make images soft
high iso is ok if you really dont care about the quality and its just getting the shot that matters paps etc
or if your just messing around gigs etc
but really there shouldnt be a need to shoot any higher than 200 just use a tripod and a faster lens
Tbh mate that is rather a load of crap. I have personally printed upto 18x12 (I think it was that) at ISO400 and it came out completely crisp, and tbh I know I could have easily gone to ISO800 on my 400D and with Noise Ninja I could have also printed at that size no problem.
How the hell can you say "you need a tripod or faster lens if ur going above iso 200" ?!? What about sports photographers?????? Night games such as football and rugby have people all over the place shooting at ISO 1600 and 3200 (normally canons tbh) and frequently have their pics printed in magazines and newspapers.
Also weddings?? In a dark dingy church with a 2.8 lens you still need to be up at at least 800 to get decent shutter speeds, any slower and people blur because everyone is moving.
I mainly shoot outdoor sports such as golf and tennis and in bad weather I have gone to 800 many a time, but it has never troubled me nor has it compromised the quality of my shots.