Yeah, that makes ALL
the difference. Your problem indoors, though, seems to be human error. If you were shooting in Tv, and had a seemingly long shutter speed, it was set that way manually. Unless you mean Av...Aperture Priority.
Tv is shutter, Av is aperture.
It's darker inside than it is outside (in this case, I'm assuming). The amount of light makes all the difference, so f8 with the 100-400 outdoors won't give you a sucky shutter speed. Jeff gave solid proof as well.
Oh, and Jeff. It's 'metering'...
[Edited 2004-04-06 08:08:32]