It's pretty simple. The 4/3rds cameras are noisy at moderate ISO's. 400 on a 4/3rds body is as noisy as 800-1600 on a larger sensor. So you need faster lenses to be able to shoot in the same light with similar amounts of noise. Thus the f2 zooms get you no real boost in speed, since they only make up for the lower ISO necessary due to the noisy sensor.
-Adam Boris Liberman wrote: > Dario, can you please explain? I don't follow your logic. > > Thanks. > > Boris > > > Dario Bonazza wrote: >> Boris Liberman wrote: >> >>> I really like the latest offerings by Olympus, the f/2 zooms are >>> indeed a step up or step forward! >> Not really. Fast lenses are required by 4/3 in order to compensate for the >> noise due to smaller pixels (pixel count being equal) and for reducing depth >> of field (when useful) due to smaller sensor size. >> >> So I perceive a F2 lens on 4/3 acting more or less like a F3.5 lens on >> APS-C, or a F5.6 lens on 24x36mm. >> >> Dario >> >> > > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
