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Rowland, is the current limiting a form of protection incase there is a short circuit?
You do understand that although the SMPS you have states 12V @ 12.5A, it will not actually try to push 12.5A thru your camera?
For example, if the camera spec states it has a current draw of 3A at 12V, that is the max it will draw from the supply, 3A.
So the SMPS will still have ~8.5A overhead for other consumers.
Think of it this way, supplies 'push' voltage on consumers.... push too much(high voltage) and the consumer pops.
Consumers 'take' current from supplies, if they take too much the supply pops. Simplistic but hoping it makes sense?
And my apologies if this is already known to you, it just reads as though you are a little confused about this but then that could just be my misinterpretation of your post.
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