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Brian Fitzgerald
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Brian Fitzgerald

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I finally managed to capture some stars with the RasPi cam.
Images captured with meteotux_pi using two 6 second exposures per frame. Exposure adjustments, cropping, and jpeg to mov conversion was done with GoPro Studio.
https://sites.google.com/site/meteotuxpi/home
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Brian Fitzgerald

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This sequence was captured with a Raspberry Pi, an 8mp Pi NoIR camera, and a Quantaray R2 filter. The unusual feature is the red flashes that begin occurring between 3 and 4 minutes into the time-lapse video. The evening was clear and I've been wondering what causes the bright red flashes. There is an atmospheric phenomenon called Green Flash that sometimes occurs shortly after sunset. It may be that Red Flash and IR Flash can follow Green Flash if the conditions are favorable. Since eyes are more sensitive to green than red, the former may have been noticed by more observers. It is also possible that this is an artifact of the camera firmware. It has also been suggested that car headlights are responsible, but I would not expect headlights to light up the entire sky. The top center of the image is very near the zenith and the evening sky was rather clear.
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IR dusk
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Pink's profile photoBrian Fitzgerald's profile photo
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I have many additional still photos from the hour after sunset and there are no additional red flashes. That would seem to make headlight glare on ground haze less likely as a plausible explanation.

Brian Fitzgerald

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chlorophyll fluorescence at dusk
following a sunny afternoon
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Brian Fitzgerald

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morning IR
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Brian Fitzgerald

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Morning skies and trees in visible spectrum and near IR.
Are the trees reflecting infrared, or are they radiating the difference between the incident blue and ultraviolet and what chlorophyl absorbs?
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Alun Jones (pengfold)'s profile photoBrian Fitzgerald's profile photo
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I have discovered that the camera connectors on the RasPi are rather fragile and have latching pins that are easily broken on either end. Fortunately, any bit of plastic of about the same thickness can serve as a substitute when clumsy handling takes its toll.

Brian Fitzgerald

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Brian Fitzgerald

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things with wings
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Brian Fitzgerald

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bright summer morning
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Brian Fitzgerald

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afternoon chlorophyll glow
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Brian Fitzgerald

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How much does chlorophyll fluoresce in near-infrared on an overcast morning?
More than I might have guessed.
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near infrared Pi NoIR cams
one pointing northeast - complete spectrum
one pointing southwest - 25A red filter
I used a Quantaray R2 filter.
The pass band is similar to this Hoya filter.
http://www.hoyafilter.com/hoya/products/coloredfilters/25ared/
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Nishit Dave's profile photoBrian Fitzgerald's profile photo
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What I may learn about is the fluorescence of chlorophyll.
http://icecube.berkeley.edu/~bramall/work/astrobiology/fluorescence.htm
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