Lawrence Kwan <[EMAIL PROTECTED]> wrote: >On Sun, 29 Dec 2002, Herb Chong wrote: >> >So what I'm wondering is, how does TTL flash work without the flash >> >having any information about the distance to the objects being >> >illuminated? >> it does on an AF body. the camera knows how far away it focused on >> something. > >But this distance info is not used in Pentax TTL or P-TTL flash system. >The original TTL does not need distance info
Also, in many cases (most, for me) the subject being illuminated is not at the distance at which the lens is focussed (it's usually much closer for outdoor fill flash). -- Mark Roberts Photography and writing www.robertstech.com
