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Hawkweed

By
Okavanga
Published:
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canonflowershawkweedinfraredirplantspectrumyellowfullbotanical

Description

A full spectrum image of a tall (1.75 m) Hawkweed plant.

Hawkweed IRWhen I started in infrared (IR) photography, I went around snapping everything I could - partly for the fun of seeing common things in their IR guise, and partly to learn how to work in an IR world. One of the shots I took then, and posted here, was this image of a field of wild flowers that I tentatively identified as Hawksbeard. What is surprising about this shot is that while the flowerheads themselves show the typical IR response of foliage - their yellow colour turning to bright white, the sepals of the flowers appear to absorb IR radiation and are seen as more or less black. Almost all other plants have sepals that show the more typical IR response of white.

Recently, I had the opportunity to investigate this anomalous IR photographic response once again. The first point to note is that I was incorrect in calling these plants Hawksbeard. In fact, they are probably one of several hundred (!) varieties of Hawkweed - a member of the
Image size
2592x3888px 7.22 MB
Make
Canon
Model
Canon EOS 40D
Shutter Speed
1/1000 second
Aperture
F/5.0
Focal Length
39 mm
ISO Speed
200
Date Taken
Aug 13, 2015, 3:34:19 PM
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Comments11
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WalnutHill's avatar
WalnutHill
Sow-thistles??    :?



J