I did that and will put together the results. I saw falloff between
shutter speeds - 1/45, 1/90, and 1/180 had more pronounced banding that
1/60 and 1/125. But all those speeds had some banding. All speeds <1/45
showed no banding and all > 1/180 showed about the same degree of
banding. I'll label the images and put them into a single file.
Mark
On 3/2/2017 4:26 PM, Larry Colen wrote:
<signal processing geek>
Mark, as an experiment, please try this at various multiples of 1/120
second (83mSec):
1/120, 2/120, 3/120, 4/120, 5/120 -> 1/120, 1/60, 1/40, 1/30, 1/24, 1/20
Since the light is effectively a rectified sine wave, any time you
integrate (expose) over a half power cycle (1/20), you should get
exactly a full cycle of the light, and it should come out even with no
banding.
If you do run an experiment where you just cycle through exposure
times from, for example, 1/500 down to 1/5, at 1/3 stop (1dB) and post
the results, that should be a very cool demonstration of
aliasing/nyquist rate etc. and I've got some science teacher friends
who'd probably really appreciate that gallery being up on the web.
</signal processing geek>
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