BTW. If it didn't, linking AE to Focus Point wouldn't be possible for flash photography, would it. My test indicate that the area exposure differences due to different focusing distance, caused by choosing different (close or far) focusing points. I guess linking AF to Foucus point means more attention to the metered values in the parts of the matrix patern, close to the chosen AF point.
Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: Jens Bladt [mailto:[EMAIL PROTECTED] Sendt: 17. februar 2005 07:50 Til: [email protected] Emne: RE: *istDS built-in flash overexposure problem Matrix works with TTL: According to the EXIF ibfo avaliable in the INFO menu, TTL flash will use matrix/pattern metering (*ist D), when an A or post A lens is used at "A"-setting. Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: Godfrey DiGiorgi [mailto:[EMAIL PROTECTED] Sendt: 17. februar 2005 00:43 Til: [email protected] Emne: Re: *istDS built-in flash overexposure problem My understanding is that P-TTL allows the camera to take a flash reading and use the full matrix exposure evaluation system, including whether you've linked the AF point to the exposure evaluation, where TTL flash only gives access to the CW Averaging meter pattern's exposure setting. I don't know which one will prove to give the best exposure with the greatest consistency, but from a purely technical point of view I'd consider the P-TTL flash system as being more complex or "advanced" compared to the TTL flash system. Godfrey --- Nick Clark <[EMAIL PROTECTED]> wrote: > It seems to me that so called advanced P-TTL is a cut down > version of proper TTL. It cuts the flash off a a predetermined > time based on the preflash exposure measurement, rather than > cutting it off due to measuring it during the actual flash > exposure. __________________________________ Do you Yahoo!? Yahoo! Mail - Easier than ever with enhanced search. Learn more. http://info.mail.yahoo.com/mail_250
