For that exact reason, I always throw an NSync LP onto the turntable hen I shoot with flash! ( NSync's music, ironically and thankfully, makes up only about 1/8000th of my collection)
Ian.Dobinson wrote:
looks like the old 1D will work on the canon side.
Yes and no.
Just did a test with my 1D and 580ex in the hotshoe with the TTL pins taped with gaffer tape..
ISO 200, f4, syncs all the way up to 1/2500 reliably.
1/3200, sometimes looks normal, sometimes dark by about a stop
1/4000, black frame
The flash power could be set at anything on manual and work fine. ISO 200, f4 was giving me a flash power of 1/128, the weakest setting on my 580ex.
Once I cranked it up to 1/4000 or faster, all the way up to 1/16000, it took ISO 3200 and a full flash pop to get a proper exposure. However, the entire scene was magenta.
Here's a shot I took about a year and a half back showing this effect.
(The flash was closer to the subject in this image than the ones I just shot so I could get away with a lower ISO.)
Once you cross the critical threshold of 1/4000, you need a flash pop that's a full 11 stops brighter to get the proper exposure, or 2000 times as much light.
So to sum it all down to something useful, the 1D syncs reliably with a neutered flash at up to 1/2500.
Mind telling me exactly which are the TTL pins that you taped? I'd like to try taping them on some of my cameras to see what I can come up with. Are they actually all of the pins other than the largest round one?
You can also use a complete dark room (except a safe light, perhaps).
Open the shutter for say, 15 seconds! (or even less if you can complete the act -- i.e. spilling waterfall of milk -- within a shorter time frame). Absolutely nothing will record until you pop the flash (or flashes) which as you say, could be as short a duration as 1/4000 of a second, or even less. Anyone got such a sample image?
EOSMIKE wrote:
You can also use a complete dark room (except a safe light, perhaps).
Open the shutter for say, 15 seconds! (or even less if you can complete the act -- i.e. spilling waterfall of milk -- within a shorter time frame). Absolutely nothing will record until you pop the flash (or flashes) which as you say, could be as short a duration as 1/4000 of a second, or even less. Anyone got such a sample image?
