He does present it as a vast conspiracy. I think that the camera makers don't mention it because they probably think no one cares. Of course, maybe they will now.
On Wed, Nov 3, 2010 at 1:09 PM, John Francis <[email protected]> wrote: > > I believe the article is written using an overly hysterical tone. > > This isn't news. It has long been known that the metering in > many digital cameras takes the maximum aperture of the lens into > account. In the case of Pentax it was discussed when the K-10 > was a fairly new body (I believe Ned Bunnell even confirmed > that the K-10 metering behaved that way). > > The is generally believed to be why metering errors are more > visible with old, fast lenses used wide open (often reported for > the 50mm/f1.2); as the charts show, the effect is only really > noticeable at an aperture wider than f/2.0. > > I suspect that, in fact, the compensation for this effect is done > by changing the measured Ev, and using whatever auto-exposure the > camera is set up to provide. Most often this will result in a slight > change to shutter speed (in Av mode), aperture (in Tv mode), or both > (in Program mode). Presumably the camera has been set up in an auto- > mode so that it can take care of the exposure adjustment; it seems > unreasonable to complain if this also compensates for the known > characteristics of the sensor. The only time this wouldn't happen > would be if the camera was being used in manual exposure mode. > But if you follow the oft-given advice, and check exposure using > the histogram at the start of a shoot, you'll get that right too. > > > On Wed, Nov 03, 2010 at 11:38:42AM -0400, Steven Desjardins wrote: >> The best thing would be to admit the correct and allow the shooter to >> turn it on or off with a custom function. Why change the iso anyway? >> why not just change the Tv? >> >> On Wed, Nov 3, 2010 at 11:30 AM, CheekyGeek <[email protected]> wrote: >> > On Wed, Nov 3, 2010 at 10:15 AM, Steven Desjardins <[email protected]> >> > wrote: >> >> The funny thing would be if they >> >> didn't correct there would no evidence of it in this data but rather >> >> in inconsistent exposure results between lenses. >> > >> > I guess I should have prefaced my comments as coming from one who >> > really likes to use old legacy glass on my K-x (and before that >> > K200D). Frankly, I'm not a DA buyer, so their current offerings are >> > irrelevant to me. I'm interested in m42 Takumars and SMC K-mounts, and >> > (to a far lesser degree) F and FA lenses designed for full-frame 35mm. >> > And if you hang around in those circles that is EXACTLY what you hear >> > about from some people. I've just never paid attention to the CAMERA >> > BODIES that the complainers were using before. >> > >> > I'd really love to hear the Pentax Position on these issues. I think >> > that most users would rather have the camera cheat the ISO in favor of >> > proper exposure with a given lens, rather than force the photographer >> > to keep track of the myriad exposure characteristics of each lens >> > (which would change depending on the aperture you were using them >> > with). >> > >> > Darren Addy >> > Kearney, Nebraska >> > >> > >> > >> > >> > -- >> > Nothing is sure, except Death and Pentaxes. >> > >> > -- >> > 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. >> > >> >> >> >> -- >> Steve Desjardins >> >> -- >> 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. > -- Steve Desjardins -- 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.
