Toralf, You can determine the type of communication by looking at the number of pins on the hotshoe. If there are 3 small pins in addition to the X-terminal, it's a digital communication flash. 2 small pins means the flash speaks analog TTL, with the belonging voltages.
Btw, P-TTL and digital communication was not introduced at the same time. Tracking the Pentax flash generations backwards, you have the current 360FGZ and 540FGZ which are P-TTL and communicate digitally. Before them were the 330FTZ and 500FTZ that featured TTL and digital communication. All flashes older than that have analog communication. The most recent ring flash from Pentax, the 140C, belongs to the analog group, btw. Boz Dimitrov has a tabular description of the analog TTL flashes here: http://www.bdimitrov.de/kmp/flashes/TTL/index.html Tried to send you a private mail with some info you might be interested in. Please give me a hint if you need a resend. Jostein 2007/8/24, Toralf Lund <[EMAIL PROTECTED]>: > Toine wrote: > > Some older dedicated pentax auto flashes do transmit or receive iso > > and aperture information. Some flash models can be set to P mode. The > > camera sets the correct aperture for the lens and the flash exposes in > > normal auto mode. Is this the digital interface you mentioned. > No, I'm talking about whatever is sent between the flash and the body to > control TTL flash operation. I've been lead to believe that prior to the > advent of P-TTL, Pentax had two ways of doing this, and that one > involved simple analog signalling, while the other was some sort of > digital protocol. I was wondering which the Vivitar 6000 (which is a > "dedicated" TTL flash) might be using. > > - Toralf > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
