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terryw
4th April 2009, 03:07 PM
Flushed with the success of the Jessops Canon fit off-camera hot-shoe and lead (much cheaper than Oly version), thanks to information provided by this forum, has anyone any thoughts or preferably first hand experience regarding the canon fit Marumi ring flash (much, much cheaper than Oly version)?

Are TTL camera functions likely to work as well as they do with the Jessops off-camera hot-shoe and lead?

Many thanks in advance of received advice.

Terry

Ian
4th April 2009, 03:10 PM
Flushed with the success of the Jessops Canon fit off-camera hot-shoe and lead (much cheaper than Oly version), thanks to information provided by this forum, has anyone any thoughts or preferably first hand experience regarding the canon fit Marumi ring flash (much, much cheaper than Oly version)?

Are TTL camera functions likely to work as well as they do with the Jessops off-camera hot-shoe and lead?

Many thanks in advance of received advice.

Terry

I'm really surprised that the lead works in dedicated mode - does 'TTL' show up on the flash LCD when connected with this lead?

It's completely different with the ring flash. If it's Canon EOS E-TTL dedicated compatible, there is no chance it will work, other than in manual mode, on an Olympus camera. Indeed, E-TTL won't work with earlier Canon DSLRs, let alone with competing brands.

Ian

terryw
5th April 2009, 12:29 PM
Yes Ian, TTL does show up on the FG LCD screen when connected via the lead.
Even the guy in Jessops was surprised when I told him about it.

As I said in my original thread, I got the information about the lead from contributors to this forum, hence my query about the possibilty of a Marumi ring-flash being equally successful.

Terry

Archphoto
5th April 2009, 01:09 PM
One explanation: if all the contacts are at an exact same place, then the non-Oly exentsion lead will just connect pos 1 to pos1 and so on.
That extension lead can be made by anyone as long as the contacts match-up.

Peter

terryw
5th April 2009, 03:18 PM
That's interesting Peter. So in theory if a Canon hot-shoe lead provides TTL for my Oly flash-gun Canon pin layout should be compatible whatever the hot-shoe mounted device? Or is that just wishful thinking? Even at 99 it's too much of a risk to find out the hard way hence my question to the forum.

Terry

Ian
5th April 2009, 03:39 PM
That's interesting Peter. So in theory if a Canon hot-shoe lead provides TTL for my Oly flash-gun Canon pin layout should be compatible whatever the hot-shoe mounted device? Or is that just wishful thinking? Even at 99 it's too much of a risk to find out the hard way hence my question to the forum.

Terry

Having looked at the contact pads on a Canon EOS-1D hot shoe, I can see that they are just about in the same places as an E-System hot shoe, except Canon use four contacts (ignoring the main large one), while Olympus uses just three.

The Canon compatible extension cord, therefore, provides E-System flash compatible electrical contact. But this is purely down to wires and contacts, not electronics. The Olympus dedicated signals from an Olympus camera will not be understood by a Canon compatible flash, nor vice-versa.

Just to illustrate this, some Canon flash units won't work with some Canon bodies, because although the contacts are correct, the signalling protocols are incompatible. I have a Canon EOS-100 film SLR with a matching EZ-430 flash. This flash is Canon A-TTL compatible, but stick it on a Canon EOS digital SLR and it will only work in manual (non-dedicated, non-TTL) mode. This is because Canon DSLRs use the later E-TTL protocol and there is even E-TTL 2 now.

There is no 'standard' for dedicated hot shoe flash signalling, and that is why a Canon-compatible ring flash won't work with an Olympus camera in dedicated TTL auto mode, only manual mode.

Ian

terryw
5th April 2009, 03:52 PM
Ian, many thanks for your time and trouble taken to explain the "why it does" (TTL lead) and the "why it will not" (Marumi or any other Canon compatible flash). You've just saved me from wasting money on spec. It's times like this when I am so very pleased that I joined this forum, it is a very friendly mine of useful information for photographers at all levels of expertise.

Once again thanks.

Terry

Ian
5th April 2009, 04:16 PM
Ian, many thanks for your time and trouble taken to explain the "why it does" (TTL lead) and the "why it will not" (Marumi or any other Canon compatible flash). You've just saved me from wasting money on spec. It's times like this when I am so very pleased that I joined this forum, it is a very friendly mine of useful information for photographers at all levels of expertise.

Once again thanks.

Terry

Pleased to be of help! :) It's very good news that some inexpensive Canon leads will work for Olympus (and Panasonic Lumix) users.

Ian