Originally posted by Caat To be honest I don't think the telephoto can get away with being less than f/5.6 (largely from a marketing perspective)
I hope not. f6.3 lenses really suck. On the other hand if it was an f4.5 I'm ready to pre order.
If it's f5.6 as I sort of expect, I'll have to take a deep breath I can't justify
buying a new lense even with severe LBA it performance at least equal to what I have can't be promised.
As it is, I have a Pentax-A* 600/5.6, and a Pentax A* 300/2.8 (and converters).and oh yes a Pentax A* 400/2.8. Since I can get any of these
lenses to perform in the 500-600mm range at f5.6 or better, I can't see myself wanting to take a downgrade in performance. AF is an operator convenience
but you get that too if you use the AF 1.7x adapter....