This evening I did a presentation/demo on what is often called rear-sync flash, or 2nd curtain sync or, as I prefer calling it, tailflash sync. The live demo was done using a standard DSLR that did not have such a capability. So I added a Copal leaf shutter to the front of a DSLR lens and using a "simple" electronic inverter switch between the shutter and the flash fired the flash as the Copal leaf shutter started to close instead of as it first fully opens ... X sync. I was able to demonstrate the effect of putting the blur (due to longish shutter exposure time recording tungsten illumination) on the side of the moving subject from whence (!) it was coming from while the flash provided the action stopping burst to record a blur-free image of the moving (walking) subject. The DSLR's exposure time was set to 2 seconds and within that time the Copal shutter operated for 1/4 second. To see the camera with attached Copal shutter follow this link: http://people.rit.edu/andpph/a-pix/leaf-shutter-dslr-7891A.jpg Now I am trying to think of other applications for a DSLR avec leaf shutter up front. Suggestions? ;) andy
