Nice sleuthing. But I'm still not convinced that 1/30,000 is the fastest/shortest.Look at the shadow on the ground too. The tail rotor's shadow is 90 degrees to its true position in the photo. Caused by the HUGE
I swear, I'm just going to have to dig out my silly-scope (oscilloscope) out of storage in the barn
Here's a fun image that I like to show others when they want to tell me about the wonderful superiority of focal-plane shutters in DSLRs.
The amount of money changing hands on horse racing results led to the development of photo-finish cameras (in the late 1930s). They avoid timing distortions that occur with focal plane shutters through the trade-off of introducing their own strange visual distortions. So, whatever other 'factors' might be involved in race results, at least the order in which runners cross the finish line should be OK. See http://en.wikipedia.org/wiki/Photo_finish for a starting point, and there is plenty on Google for those who may be interested.As for focal plane shutters, that helicopter picture says it all!
Nice sleuthing. But I'm still not convinced that 1/30,000 is the fastest/shortest.I swear, I'm just going to have to dig out my silly-scope (oscilloscope) out of storage in the barn this winter and let it warm up for a few days (old tube-type, about the size of a large TV set and weighs almost 200 lbs.) Photographing a 20kHz scan line against a lit scale will be the definitive test. I only worry that all that finding and hauling it out and setting it up will be for naught, I'm not sure if that old sillyscope will have a bright enough electron gun to photograph. Nor if its 70 year old phosphors on the screen will cause a persistence problem. Like what I ran into when photographing scan lines on a TV.p.s. Don't worry about the rotating target being a problem for deducing shutter speeds with these cameras. They don't have a focal-plane shutter. That problem only exists with DSLRs, and its exactly why they can NEVER have high-speed flash-sync. (Badly implemented fake high-speed sync, yes, but not real high-speed sync.)Here's a fun image that I like to show others when they want to tell me about the wonderful superiority of focal-plane shutters in DSLRs. Look at the shadow on the ground too. The tail rotor's shadow is 90 degrees to its true position in the photo. Caused by the HUGE delay in a focal-plane shutter having to traverse the width of the sensor. You can't even use a focal-plane shutter for accurate "photo finish" sports events. A person's foot could be touching the baseball base before he was tagged "out", but the photo would never reveal that due to the focal-plane shutter's inherent flaws and limitations. All those photo-finish events all throughout history could be 100% in error, unless they are analyzed for the type of shutter used to take the image. The speed, direction, and duration of all items in motion in the image would have to be reanalyzed to find any "truth" in them whatsoever. The use of focal-plane shutters all last century have given us a FAKE representation of reality. And nobody cares. :-)
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