[click on image to see a larger one]
Human Vision (VIS):
Reflected UV (Baader-U):
Simulated Butterfly Vision:
Simulated Bee Vision:
Quadriptych of human vision, UV, simulated bee and butterfly vision (left to right, top to bottom):
This orchid has not a very specific UV pattern, its petals are UV reflective around 380nm, but its middle tip (column and gymnostemium) have a rather UV bright spot reflecting around 370nm surrounded by an UV-dark area which gets nicely visible.
The UV-Nikkor 105mm lens is known to be a very well working one for
multispectral imaging w/o focus shift, with a nice 1:2 close up focusing
capability from infinity up to 48cm (0.48 meter). Sharpness is very
good and so is its contrast, even from f4.5 onwards. With a Nikon PN-11
extension tube of 52.5mm length it reaches 1:1 (1x) magnification. It
has the standard Nikon-F mount, and it covers full format sensors (41mm
image diameter). It is defined to reach down to 190nm and up to 1300nm in near infrared; my measured transmission spectra of it may be seen here.
I have written more about this orchid HERE.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos