After months of consulting multiple manuals, books, forums, and experts, I finally figured out why my Canon 50D + 580EXII flash wouldn’t work in high speed sync mode. That is, when I turned on the flash the maximum shutter speed was 1/250s. No matter what I set the ISO, shutter speed, mode, or aperture to, I could never get shutter speed faster than 1/250s. No matter what mode and settings I applied to the flash and/or camera, as soon as the flash was ready, shutter speed dropped to 1/250s. (I could easily take pictures without flash at speeds faster than 1/250s as lighting conditions and settings permitted.)
If you’re encountering this problem on a 50D (and likely other Canon models) here’s what you (probably) need to do:
(more…)