Through the lens metering solves that problem quite nicely. If you want to use a handheld meter, you have to work a bit harder. Paul On Jun 28, 2006, at 8:10 PM, Don Sanderson wrote:
> My understanding was that this was the "effective" ratio. > Like the new lenses that claim that their super low dispersion glass > allows smaller sizes at the same effective speeds. > How would one achieve critical exposure accuracy if f/4 on one lens > was equivalent to f/4.5, or f/3.5 on another? > Yikes. > Or are the variations very, very small? > > Don > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of >> William Robb >> Sent: Wednesday, June 28, 2006 6:32 PM >> To: Pentax-Discuss Mail List >> Subject: Re: Seen on eBay >> >> >> >> ----- Original Message ----- >> From: "Don Sanderson" >> Subject: RE: Seen on eBay >> >> >>> Uh guys, maybe I'm missing something but unless someome is lying >>> about their product isn't f/4.0 always supposed to be f/4.0?? >>> It'd pretty much leave slide shooters who use a manual meter SOL >>> if it wasn't, wouldn't it? >> >> The f-stop is a mathmatical calculation of actual aperture size vs. >> focal >> length. >> It says nothing about the transmissive abilities of the glass. >> >> William Robb >> >> >> >> -- >> 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 > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
