Timelapse in the “dark”

Infrared (940 nm)

The night of a plant, 11 h 20 min condensed into a 10 s-long video. Only source illumination were two LEDs emitting infrared radiation at 940 nm (LED Engin LZ1-10R702). Camera: Olympus E-M1, converted to full spectrum, adapted Soligor 35 mm f:3.5 objective at f:8, Heliopan RG780 long pass filter on lens. Movement is most evident with the video at full screen resolution. Images converted to greyscale.

Ultraviolet-A (385 nm)

The night of a plant, 9 h condensed into a 8 s-long video. Only source illumination were two LEDs emitting ultraviolet-A radiation at 385 nm (LED Engin LZ1-10UA00). Camera: Olympus E-M1, converted to full spectrum, adapted Soligor 35 mm f:3.5 objective at f:8, StraightedgeU bandpass pass filter (UVROptics) on lens. Movement is most evident with the video at full screen resolution. False color, white balance set on white PTFE target.

Ultraviolet-A (365 nm)

The night of a plant, 12 h condensed into a 11 s-long video. Only source illumination were two LEDs emitting ultraviolet-A radiation at 365 nm (LED Engin LZ1-10U00), except during the last 90 min with skylight entered through a nearby window. Camera: Olympus E-M1, converted to full spectrum, adapted Soligor 35 mm f:3.5 objective at f:8, Baader U bandpass pass filter on lens. Movement is most evident with the video at full screen resolution. False color, white balance set on white PTFE target.

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Plant at the end of third session. Window light, Firecrest UVIR filter.

IR images edited in Capture One, UV images edited in PhotoNinja, videos created in ImageJ (Fiji distribution).

I will describe the rig I used in a separate post. The photograph below gives a preview.

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Camera “rig” as used for the three videos. Only the LEDs and filter were swapped between sessions and the objective re-focused at the start of each session. Photographs were taken on three consecutive nights, and the plant returned to a well lighted place during each daytime.
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