March 5 2011 - Photo Jottings

March 5 2011


If you’re interested in the intricacies of shutter/flash synchronization but aren’t sure exactly how it works, then watch this video by Paul Duncan, he does a great job of explaining it.  Topics include how the focal plane shutter works,  1st and 2nd curtain, flash sync, HSS and more in this roughly 9 minute video.

I guess I don’t quite understand the electronic shutter part where he says it’s powered on and off to get a higher sync speed, without the shutter operating, and is not a common capability because the sensor electronics uses processing that would be better used to create a higher quality image. I thought when shooting video, that’s exactly what’s happening, the sensor is powered on and off, the shutter doesn’t actuate at all.  So why wouldn’t you get, say, a 1/500th sync speed now with the video capability on DSLR’s?  Also, when I’m over sync speed on my A700, why is my blocked area on top, instead of the bottom as you see in the vid?  I understand the image reversal part, but maybe using dumb, off-camera flash mode like I do makes things come out differently.  Hmmm, oh well, more mysteries to ponder.

I’m working on the Sigma 70-200mm F/2.8 II HSM lens review right now.  I should have that ready in a week or so.  This is telephoto lens review number two, (out of three) that I’m reviewing, plus the Sony which I have already. 

Great flash sync video
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