Troy and Humayun,
I've tried both ways and get arround 1/200 or 1/320 sec for a spike thats 1/3 to1/2 halfway along.
HOWEVER ...I've loaded these to images into photoshop and get not one but two spikes and the rgb are not at the same point. I am not sure what this means but I don't think it's good. I don't know of a way to post the histograms, If you can tell me then i'll put them up.
I may need to compare with your new one Troy, when it arrives as I'm at a loss now
cheers geoff