----- Original Message ----- From: "Cory Papenfuss" Subject: Re: Firmware 1.10
>> If that were true, then TTL metering in the general case wouldn't >> work consistently for different lenses in any exposure mode at >> different lens openings. >> > When lenses are wide open, it's less of a point source though, > right? I don't think so, the lens is still covering the full format, but the light is dimmer. Large format lenses often increase the size of the image cirgle as the lens is stopped down. > >> > In any even, I'm talking out my ass... I don't know much about > optical lens design. I could also be confusing the metering inaccuracy > I've seen with my *ist-DS with the 3rd-party, split-prism focus screen. I > don't recall if I had issues with metering inaccuracy with K/M lenses and > the stock screen... been too long since I used it. > I'm thinking that the metering is just plain innacurate as the light levels to the sensor drops closer to the sensitivity cutoff. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
