What makes glass "Fast"

[Steph]

Oh thats usually a given but I think Mike was referring to the bulkiness of a fast zoom versus prime.

Ah OK! I misunderstood his post then.

 

[prodigy2k7]

Ya, I was going to respond as Steph said but I realized what he actually meant as usayit said

 

[RyanLilly]

Surely you meant large maximum aperture.

Oops, I fixed my post, Sometimes my brain is thinking one thing and my finger type something else.