Copied from page 187 in the K-5 manual: 
http://album.heime.org/album/temporary/pttl.jpg

Stig Vidar Hovland

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Sendt: 12. april 2011 12:14
Til: Pentax-Discuss Mail List
Emne: 645D: flash and manual focus lenses

To those interested in technical stuff about 645D, I've looked at how
flash metering is implemented in 645D.

As most of you probably know, the K-mount cameras no longer support
the old-style TTL flashes. The last camera to do so was the *istDS2.
Now it's only P-TTL that works. And only with AF lenses. With manual
focus lenses you have no TTL flash metering at all.

I was worried that this might be the case for 645D too, but
fortunately P-TTL works with the 645A-series lenses too. If you can
live with inconsistencies in automatic white balance. A minor nit, in
my opinion.

Full-length meanderings here:
http://alunfoto.blogspot.com/2011/04/645d-part-3.html

Jostein

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http://www.alunfoto.no/galleri/
http://alunfoto.blogspot.com

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