lol, so you got the D90 already? Anyway d90 @ 6400 isn't advisable. Even for cameras like 7D/D300s, iso6400 is pretty noisy. I'm still figuring out how come D90 has no ISO 100 but has H-something, something. got three of this H-something before ISO 200. gonna read the manual on my free time tmr.
Yes, got it already, enjoying it since..no regret. Manual says all the H's beyond iso3200 setting will prone to noise,not too useable. But hey...its there, useful if you need it to shoot certain impt shot. Not sure abt the H's before iso200 tho, still learning :sweat: