I think he just means the actual ISO of the 4/3 sensor is slower for equivilant quality of image....
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Boris Liberman Sent: Thursday, March 08, 2007 1:17 PM To: Pentax-Discuss Mail List Subject: Re: Sigma DP1 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 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
