Brian, I have an *ist D, which I have used several times in a high RF environment (Amateur Radio Field Day) where we had as many as 6 transmitters in use simultaneously with no effect over several hundred photos. I admit that there were no external cables connected so that may be the signal path. Try some ferrite beads on the cables and see if it makes any difference. If you are in the USA, unfortunately, the cameras are part 15 devices that have to put up with any interference they may receive (in other words it's your problem not someone elses) and cannot cause any interference to anyone else.
jm ----- Original Message ----- From: "Brian Dunn" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, July 26, 2006 12:53 AM Subject: Radio Frequency Interference > > Hi all, > > I've been noticing some interference in some photos lately. One set was > while > photographing at a backdrop with two flash units directly connected by > wires > to a DS's hot shoe. The other set was while roaming around a venue with a > different DS with a Pocket Wizard transmitter and a local flash attached > to > the DS's hot shoe. > > These are both new DS cameras. On the first, the backdrop photos were > connected with 10-15 feet of wires, ISO 200, and every now and then a > photo > would have fairly heavy wave patterns in the darker parts of the entire > image, kind of like the waves you get on a TV set when the tuner is not > quite > right. Only some photos though, as if someone was occasionally powering > up a > big CB or Ham radio nearby. It looked like the image was pasted onto flag > waving in the breeze. > > The other time the waves were a slightly different kind of pattern, and > they > seem to only be in some of the high ISO photos taken with the Pocket > Wizard > transmitter turned off but still connected. This environment had a lot of > people running around with business radios being put to fairly heavy use. > > I'll try clamping an RFI choke to the synch cable, but I'm surprised that > this > has happened in the first place, on two different cameras. > > Has anyone else seen this yet? > > > Brian > > > -- > > Brian Dunn Photographic > http://www.bdphotographic.com > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
