On Dec 17, 2010, at 7:23 PM, Leon Altoff wrote: > 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.
But that more accurate focus is out the window if it's not SDM. The screw focus lenses are still slow, even with the newest cameras.. Yes, a wide stop is nice for manual focus, but with my 62 year old eyes that's something I rarely do any more. I do still use my A400/5.6, but I wouldn't buy another manual focus only lens at this point. So for someone as young as Cory, a wide stop for easy manual focus might be a consideration. For me, it's not. Paul > > 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. -- 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.
