Yes, I expect since TTL isn't supported on the K10D, so it does fire at full. If you can find out the GN at ISO 100 you should be able to work out your own flash table from there. The ISO 100 GN in Meters as published by Pentax for the AF220T is 22 so to get the correct aperture you need to do a little math.the formula is simple if you have a calculator. (f number) = GN/distance(in meters). If you double the ISO you have to double the GN by the way, so that parts easy enough at least. So your distance of 1.5m at ISO 200 would give this
f = 44/1.5 = 29 1/3 so yes f 8 was way too wide at that distance. I'd go with ISO 100 since you have a K10d. That should give you an f stop value of 14.66_ which is much more manageable. wendy beard wrote: > I admit, I'm useless when it comes to using flash. I use it as little > as possible. When I do, I just stick the flash on the Canon and it all > magically works - even on the G9 (tho the flash is bigger than the > camera!) > I don't remember having any problems with the MZ-S and 360FGZ > That's the magic of E-TTL/P-TTL, I suppose > Anyway, I no longer have the 360FGZ and both the Canons are off for > repair and sticking a flash on the G9 is ridiculous - so I'm trying to > get the K10D working with an AF220T > Here comes the stupid question. > How do I know what settings to use? > My old, old agfatronic used to have a table of aperture vs asa vs > distance. All that's on the back of this flash is "control range > 0.7-5.5m" > It seems mighty powerful at close range. ISO 200 f8 1/180s and a > distance of approx 1.5m and it's way over-exposed > > Is it because TTL isn't supported on the K10D so the flash just fires > at full power all the time? Will it just be pure luck if I get a well > exposed shot with this combination? > > Wendy > > -- Vote for Cthulhu. Why settle for a lesser evil... -- Dr. Jerry Pournelle -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
