Are you sure that you have a 45CL-5? It's a model which I've never seen nor heard of before, but it's possible that it is a non-standard custom model number for a specific supplier or territory.
The answer to your question is "possibly": but you asked if it can be used safely so the answer must be a firm "no".
Various sources (e.g. here) quote the trigger voltage on the (presumably closely related 45CL-4) to be a little higher or even vastly higher than Canon's 6v limit. Metz themselves are unclear on the issue and it doesn't help that they do not list the CL-5 on their support page nor on their main corporate page, but they do list a 45CL-4 and a 45CL-4 Digital. The differences between the two models may just be to add additional capabilities which suit digital SLR's but perhaps it also brings the trigger voltage below Canon's 6v limit.
As there is so little published information about the 45CL-5 then I strongly suggest that you do not risk your camera until you have a definitive answer from Metz themselves: you can contact their support service by clicking here. The link is for the UK, if you're elsewhere (Australia?) then you may need to make your own search.
I hope that I've been of some assistance and that the links provided help you to get the answer straight from the horse's mouth. Please take a moment to rate my answer.
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Hi Ken,
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As it's a 45CT-5 then it's your call whether to use it with your D40 (or is it a 40d?).
The trigger voltage on any given example is not often consistent, but typically it's anywhere from about 14v to 45v (officially it's supposed to be 30v). Depending upon the source, the Nikon D40 is safe up to 12v or 250v (the first figure came from Nikon USA and the second from Nikon UK).
But if you actually have the Canon 40d then the safe limit is very definitely 6v, so it will not be safe.
A separate point regards the basic suitability of your flash: if it comes with a dedicated SCA module you might expect it to allow TTL flash metering. If so, then you'll be disappointed: the TTL flash metering was designed to work with 35mm film cameras which measured the light reflected off the film surface during exposure (TTL-OTF = Through The Lens-Off The Film). Basically the flash fires and when the light sensors pointing at the film surface measured sufficient light the flash was quenched. Your digital camera uses a different method, so TTL flash quenching will not work. It can be used (subject to trigger voltages) in regular manual and automatic modes though.
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Thank you for the help. My apologies I checked and it is a CT5 not a CL5.
My humble apologies it is a CT 5 not a CL 5
that would explain why you cant find it listed.
Should have been:
Can a Metz 45CT 5 be used with a CanonD40 safely?
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