I'm fairly sure I have a circuit diagram for one of these, if you really want to bugger it up. ---- "P. J. Alling" <[email protected]> wrote: > mike wilson wrote: > > ---- "P. J. Alling" <[email protected]> wrote: > > > >> I've tried that still no joy with the first unit. They do, well my > >> newer AF280T does actually seem to talk to a limited extent, it actually > >> sets the shutter speed and aperture in program mode with the K20D, the > >> first doesn't give correct exposures as an auto flash on the *ist-Ds on > >> either red or green settings though TTL flash works just fine. It's > >> completely weird. Especially if the AF280 isn't supposed to talk to the > >> K20D at all... > >> > > > > Maybe you have some dirt on your flash sensor, in the green ring at the > > front. > > > I was hoping that might be the case Mike, but I just examined the sensor > opening closely it looks like a simple hole in the case, on both > AF280Ts, and didn't see any obvious dirt. I tried a blast of canned air > anyway. I just tested the damned thing again, still no joy. Most > inexpensive flash units I've examined used a different size opening to > control the light light to the sensor, I think the AF280T actually has > an electrical switch, (I really don't want to open the case to find out, > if it works on at least one mode, I know I'm capable of rendering it > entirely inoperable, I've done that before), The fact that it seriously > underexposes in red mode, (and the proper exposure lamp lights), and > dumps the entire charge in the capacitor in green mode (with no proper > exposure light), seems to point to a bigger problem than just dirt, or > so it seems to me. Too bad the thing isn't under warranty. My target > is only about 6 feet away, well within the operating range for either mode.
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