On 4/12/2011 13:14, AlunFoto wrote:
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
Fascinating. I should point out that I am not using a P-TTL flash (I
just wrote a longish message to Collin on the matter). I have noticed
that sometimes the white balance of my flash shots is somewhat imprecise
(which is a gentler term than incorrect). But then almost always it is
fairly easy to correct in post.
My immediate reaction to the diagram in your blog entry, Jostein, was a
sense of deja vu from the minor adjustments that I have to do in my
workflow.
I don't have readily made measurements or tests, but I tend to think
that these variations may be related to one another and actually be
related to some basic tech that Pentax is using in their PRIME (II)
engine. After all, 645D and K-7(K-5) seem to have similar if not equal
(up to state of tune) image processors.
Boris
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