It seems to work relatively better with K/M lenses and older Flash
units. The 280T and 200T seem to give good exposures in M mode with the
aperture at any "acceptable" value. If you select an aperture value at
a distance the flash doesn't have enough power for it's underexposed, of
course and occasionally for no apparent reason you'll get an
overexposure in the middle of a well exposed sequence, (I haven't seen
an consistent cause for this yet).
Dario Bonazza wrote:
Paul Stenquist wrote:
I have an *istD, but I've found that my TTL flashes work fine in all
shooting modes at speeds of 1/150th or less. They seem to perform
slightly better at ISO 400 than at other settings, but that's hard to
determine for certain. The unit I've used most often is the Pentax
AT400. Of course the normal variables of flash photography apply. I
think this has caused a lot of people to conclude that the camera
doesn't handle TTL very well. The Sigma 500 Super, which is a Pentax
dedicated flash, works very well in every mode I've tried, including
high speed synch, p-ttl, ttl, and trailing curtain.
My experience (with *istD + AF500FTZ) is that if you set P mode on the
camera, the lens will be automatically stuck onto f/5.6 (even when
using say f/1.4 lenses!) and flash exposures will turn out acceptable.
If you try using faster apertures (e.g by using Av mode), the pictures
will be hopelessly washed out. Looks like the camera TTL is unable to
control the flash output and overcomes that by controlling the lens
aperture (just a guess). This happened with 2-3 different cameras
(*istD). Not tried the *istDs yet.
Anyone having such experience? Any advice for using fast lenses in
order to increase the flash range/reduce recycling time?
Pentax adviced me to use an older flash (AF400T, AF280T) featuring
auto (non-TTL) exposure ;-( Clever, isn't it?
Dario
--
A man's only as old as the woman he feels.
--Groucho Marx
