- Oct 22, 2000
Ah, OK. My mis-understanding.Originally posted by: 6000SUX
Yep. That's my point. It's fast because it's faster than many other 400mm lenses.Originally posted by: Zenmervolt
Yes, at F2.8 it's a fast 400mm lens. It's average for a 200mm prime and slow for a 50mm prime. As focal length increases, it becomes harder to have a fast lens because of the giant-size front glass that is required.Originally posted by: 6000SUX
I understand. I'm just saying that the Canon 400 f/2.8, for instance, is regarded by the whole world as a fast lens-- and that's an f/2.8 prime.