Inside Of A Christmas Tree
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Old 01-18-2015   #1
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Default Inside Of A Christmas Tree

Taken, looking straight up inside of a very tall x-mas tree... I used the spinning effect to get these results...

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Old 01-18-2015   #2
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Default Re: Inside Of A Christmas Tree

Nicely done, reminds me of the time tunnel in the 60s tv series.
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Old 01-18-2015   #3
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Default Re: Inside Of A Christmas Tree

A cool shot Carol.
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Old 01-18-2015   #4
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Nice.
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Old 01-18-2015   #5
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Default Re: Inside Of A Christmas Tree

I counted 34 segments in one of your light paths. Assuming that these lights were blinking at 120 times per second, which is twice line frequency in the U.S., your exposure time was a trifle over 1/4 second. I also found a string that had only 16 flashes, which was probably flashing at 60 cycles per second because of a defective rectifier or LED. By plotting the positions and distances of the individual spots in several carefully chosen light paths, you could determine how fast you were spinning your camera and how much and in what directions the spinning axis wobbled while the shutter was open.
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Old 01-18-2015   #6
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Quote:
Originally Posted by scoundrel1728 View Post
I counted 34 segments in one of your light paths. Assuming that these lights were blinking at 120 times per second, which is twice line frequency in the U.S., your exposure time was a trifle over 1/4 second. I also found a string that had only 16 flashes, which was probably flashing at 60 cycles per second because of a defective rectifier or LED. By plotting the positions and distances of the individual spots in several carefully chosen light paths, you could determine how fast you were spinning your camera and how much and in what directions the spinning axis wobbled while the shutter was open.
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Old 01-19-2015   #7
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Quote:
Originally Posted by scoundrel1728 View Post
I counted 34 segments in one of your light paths. Assuming that these lights were blinking at 120 times per second, which is twice line frequency in the U.S., your exposure time was a trifle over 1/4 second. I also found a string that had only 16 flashes, which was probably flashing at 60 cycles per second because of a defective rectifier or LED. By plotting the positions and distances of the individual spots in several carefully chosen light paths, you could determine how fast you were spinning your camera and how much and in what directions the spinning axis wobbled while the shutter was open.

Actually , the lights were not blinking and were steady on at the time of exposure... thanks for the info....
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Old 01-19-2015   #8
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...or at least that's what it looked like. Attached is a shot of another Christmas tree I took in 2010 at 1/30 second while swinging my camera rapidly downward. all the light on the tree looked as if they were steadily on, but some of them show four distinct flashes and some others show only two. If you look closely, you will also see some vertical bars in the background slightly above the midline of the image are produced by compact fluorescent lights. Those didn't go completely dark between light pulses but you see the rhythmic variation in brightness as a kind of striped appearance. You (and I) see these lights as burning steadily because of a sort of persistence effect of our eyes. The lights showing as constant vertical bars are incandescent lights whose brightness fluctuations within a power cycle are much too small to be detected by this crude technique.
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Old 01-20-2015   #9
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yes... really nice technique..
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Old 01-20-2015   #10
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Originally Posted by carol51 View Post
Actually , the lights were not blinking and were steady on at the time of exposure... thanks for the info....
LEDs blink even when constant on - it's just too quick for the eye to perceive.

For example, our led-lit tree. Notice ten "flashes" per LED, correctly indicating 1/6s exposure:



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