Wide open or not, the camera is still metering through the glass of the lens. The variation in lenses is largely a matter of glass and internal light loss. Now, if you REALLY want to be totally accurate, you can test a lens at each f-stop to see if they progression is correct, but in most cases, the lens will meter the same throughout the range as it does wide open. Paul On Jun 28, 2006, at 8:34 PM, Don Sanderson wrote:
> I've never heard this. > How would a TTL meter handle this when metering is done wide open? > It would have no idea that one lens needed to be stopped down > just a bit more/less than another.? > > Don > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of >> Paul Stenquist >> Sent: Wednesday, June 28, 2006 7:15 PM >> To: Pentax-Discuss Mail List >> Subject: Re: Seen on eBay >> >> >> If you're not using a through the lens meter, you have to calibrate >> your lenses for exposure. I frequently used a handheld incident meter >> when shooting transparency film with my 6x7. But I had an exposure >> compensation factor for each lens. For example, I think my 300/4 >> required 1/2 a stop of extra exposure, while my 105/2.4 was right on. >> Paul >> On Jun 28, 2006, at 7:10 PM, Don Sanderson wrote: >> >>> 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? >>> >>> Don >>> >>>> -----Original Message----- >>>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf >>>> Of >>>> Joseph Tainter >>>> Sent: Tuesday, June 27, 2006 7:38 PM >>>> To: [email protected] >>>> Subject: Seen on eBay >>>> >>>> >>>> "A prime 2.8 lens is actually faster than a 2.8 zoom because of the >>>> increased contrast which you'll find remarkable in comparison to >>>> your >>>> zoom lens." >>>> >>>> Got that? >>>> >>>> Joe >>>> >>>> -- >>>> 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 >> > > -- > 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
