On Tue, Apr 12, 2011 at 6:58 AM, Boris Liberman <bori...@gmail.com> wrote: > On 4/12/2011 13:49, Paul Stenquist wrote: >> >> Hi Jostein, P-TTL works with my K-5 when using the manual focus >> A400/5.6. The same was true with my K10, K20, and K-7. However, P-TTL >> doesn't work with my K lenses. I think autoexposure is the key here. >> Paul > > Paul, can it be that with A-lenses P-TTL works in reduced functionality > mode? I am asking because it is my understanding that P-TTL uses distance to > object (reported by AF lenses) for its processing. > > Boris
P-TTL uses preflash with A and later lenses for TTL calculations. It can use distance reporting on FA and later lenses to improve the calculation for direct flash (not bounce) but that ability is not required and is in fact not supported by all AF lenses, only FA and later. -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
