The AF400T might simply not be able to shorten the flash duration
enough to work with an ISO 200 sensitivity at macro ranges. Are you
stopped down all the way?
With film, all the flash metering was off the film, directly. I'm
not sure how it happens with digital, but I suspect that preemping
calculations now play a greater part. If the metering is still done
off the medium, it has to cope with a CCD that has different
reflective properties than has film.
It works the same way. The TTL flash metering sensor in the camera
has been calibrated to work with the sensor's reflectance.
Godfrey
On Jul 17, 2005, at 1:17 PM, Jostein wrote:
Markus,
Sorry, I should have mentioned that I use TTL, not manual flash.
As to why the *istD handles flash differently from Z-1 and LX, I'm
a bit at loss.
However, there's manuy circumstances that have changed. At some
time in the nineties (actually after the Z-1), Pentax began
communicating focus distance data from lens to camera (FA lenses),
and changed the flash communication from voltage to digital
(AF300FTZ and AF500FTZ).
With film, all the flash metering was off the film, directly. I'm
not sure how it happens with digital, but I suspect that preemping
calculations now play a greater part. If the metering is still done
off the medium, it has to cope with a CCD that has different
reflective properties than has film.
Jostein
----- Original Message ----- From: "Markus Maurer" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, July 17, 2005 9:53 PM
Subject: RE: Dual Flash with *istDS
Hi Jostein
Does the AF400T in manual mode with 1/25 power setting still give
too much
flashlight with the *istD?
And why is the handling of flashlight different on a digital body?
a film only user wonders ....
greetings
Markus
-----Original Message-----
From: Jostein [mailto:[EMAIL PROTECTED]
Sent: Sunday, July 17, 2005 3:46 PM
To: [email protected]
Subject: Re: Dual Flash with *istDS
Brian,
That's a very interesting setup, not the least in light of the
recent
threads about macro flash. What's your working distance in this
particular shot?
I have been experimenting with my AF400T and the *istD. So far I've
only tested it at macro distances, where it delivers waaay too much
light. All my exposures have been at least two stops over. Much
to my
disappointment, because it was my macro flash of choice for use
with
Z-1 and LX. :-(
Jostein
----- Original Message -----
From: "Brian Walters" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Sunday, July 17, 2005 2:07 PM
Subject: PESO: Dual Flash with *istDS
Hi all
This photo of a flower (Grevillea lanigera, for the botanically
minded) was taken with a dual flash set up on a home made bracket
attached to the *istDS. This is the set up I've been using for a
few
years with the Super A but this is the first time I've used it on
the
*istDS.
http://members.ozemail.com.au/~sgap/photos/paw/g-lan-paw.html
Mainly, I'm posting this because a few people have wondered
whether
old flash guns can be used safely with the *istD/DS. The set up
comprises an AF280T on the left hand side of the camera (looking
from
behind) and above the subject with an AF200S on the right on about
the
same axis as the subject. The flashguns are attached to the
hotshoe
via a combination on 5P and 4P off-camera cables and adapters
(although ordinary sync cables could be used because the cables
only
provide electrical connections - both flashes are fired on
'Manual').
Both flashes also have some translucent plastic in front of the
flash
heads to diffuse the light.
The background is a bit dark but I don't really mind this as it
makes
the image a bit more three dimensional. Comments on the subject
and/or technique welcome.
Cheers
Brian
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Brian Walters
Western Sydney, Australia
