This one was a whole bunch of work for one smallish shot...
So, in past rounds of "science-y things with my fancy camera," I looked at the effect of ISO settings and apertures. This time out, I wanted to look at something moving, and the way that it blurs with increasing exposure time.
My initial thought was to try to take pictures of a falling ball, but it's too hard to get that to work consistently without setting up some kind of electronic trigger, and I wasn't willing to do that. But, of course, a swinging pendulum will always be in a relatively narrow range of positions, making it a better moving target.
So, the composite below is a bunch of shots of a yo-yo hung from the ceiling in our basement, swinging back and forth. The focus was set to manual, the f-stop maxed out, and I adjusted the shutter speed and ISO level to get approximately the same exposure each time. I got it in nearly the same position each time by the simple expedient of holding down the shutter button in continuous shooting mode and hoping for the best.
The colors are kind of wonky because I couldn't find the dark blue plastic yo-yo we have somewhere, only one that's clear plastic with writing on it. At the longer exposures, that's blurred out enough to be nearly invisible without cranking the contrast way up.
I may re-do this at a later date, just to get cleaner images, but this is a decent proof-of-principle for the effect I wanted. It's kind of impressive to me how fast the shutter can be and still produce significant blurring-- this is only moving at a few meters per second, and yet there's very definite blurring at a shutter speed considerably higher than the standard video frame rates.
Anyway, that was fun. And as a bonus, it explains why so many of my photos of the kids look kind of fuzzy...
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