Reflex lens: visible donut bokeh + animal(s)/bird(s)/insect(s)

Challenge #2 in the Camera device series. Hosted by Jerome August.
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1. Shots must be shooted by a reflex lens. (catadioptric lens / mirror lens) eg. Rubinar 300mm F4.5, Rubinar 500mm F5.6 ` 2. Donut bokeh must be clearly visible. (annular shape of defocused areas of the image caused by the shape of the entrance pupil.) ` 3. Animal(s)/bird(s)/insect(s) must be the main object(s).
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African Darter - Anhinga Rufa
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Taken at Lake Panic near Skukuza.
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Submitted: Thursday, 5th May, 2011 08:59 (GMT)
Taken: Wednesday, 5th May, 2010
Focal length: 500 mm
Shutter speed: 1/800 sec
Aperture: F6.3
ISO: 800
Notes: Manual Focus, Manual Exposure
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