Paul
On May 12, 2005, at 7:13 AM, 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
