----- Original Message ----- From: "Toralf Lund" Subject: Re: TTL, P-TTL, other *TTL's and DSLRs (Was: Wedding photography)
> Something I've been wondering about lately, is which is better of a > traditional auto-mode and P-TTL. I mean, which is greater of the error > in the pre-flash based prediction and the inaccuracy resulting from > using a sensor not measuring through the actual lens (and making > calculations based on a "theoretical" aperture)? Any thoughts? > > Maybe the best result might be achieved if you used an external sensor > to control the actual flash operation, but included a through-the-lens > pre-flash measurement to collect knowledge about the actual exposure > conditions? Is anyone doing that? Once I left Nikon, I discovered that basic auto flash was more accurate than TTL flash. I happen to have a very accurate auto flash though, I expect a cheap auto flash will be as inaccurate as the rather useless Pentax in body flash control. I suspect that the best way to get body controlled flash would be to transmit distance information from the lens rather than use reflective information from the sensor. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
