Although I don't know for sure, I can make an intelligent guess about how Canon's system works. The only way to achieve it with a focal plane shutter is to start the flash before the first curtain moves, and stop it after the second curtain closes. You are effectively creating a continuous light with the flash for the whole duration of the exposure.
Correct. The technologies employed by Canon and Phase to accomplish high sync speed are NOT the same. One is using a stroboscopic effect to create effectively continuous light during the entirety of the focal plane travel and the other is dealing with the timing of the sensor.
The upside of the Canon method is you can get down to the ludicrous 1/8000th speed. The downside of the Canon method is the ammount of flash power you're able to produce is extremely limited at 1/8000th and you can only use a select number of compatible flashes.
The upside of the Phase method is you can use FULL power of the strobe and you can use a variety of strobes. The downside of the Phase method is you're limited to "only" 1/1600 (though that's really way more than you need 99.9% of the time) and you must use a leaf shutter lens and a digital back engineered.
Of note of course is the fact that Phase's Schneider Leaf Shutter Lenses will sync at 1/800 with any digital back. Only the 1/1600 sync requires a 65+/40+.
Doug
Doug Peterson
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Head of Technical Services, Capture Integration
Phase One, Leaf, Cambo, Canon, Apple, Profoto, Eizo & More
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