But you don't use the 2.8 just for shooting wide open. f2.8 provides more light for focusing and shallower depth of field which should give more accurate focus.
That said I have the 60-250 and love it. (chosen over the Sigma 100-300 f4 because the 60 end of the range lined up with the 17-70 zoom I usually carry and the bokeh of the 100-300 bothered me). Leon On 18 December 2010 11:11, Cotty <[email protected]> wrote: > On 17/12/10, paul stenquist, discombobulated, unleashed: > >>An f2.8 lens that isn't sharp until f5.6 offers no real advantage. > > That's the most important thing to consider. Absolutely no point in a > 2.8 lens of this zoom range if you're not gonna use it! And when you do, > if it sucks, you'll be forever kicking yourself that you didn't go for > the other one ;) -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.

