While I'm quite happy with the *istD ttl performance, I should point out that I shoot RAW exclusively. Shooting jpegs with ttl is akin to shooting transparency film with ttl -- an iffy proposition at best. Paul
> 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 >
