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Evening rainbow with supernumeraries

Evening rainbow with secondary bow and supernumeraries

[IMG_2712sg/jpg]

Rainbow with secondary and supernumeraries [Leeds UK, 21 June 2004; Canon 10D]

This bright rainbow has a faint secondary bow outside the main one, and, more interestingly, some clearly visible supernumeraries. These are the purple-green bands just inside the main bow, and are an effect which cannot be explained by classical physics -- a wave theory of light is necessary to account for them.

You can see them more clearly in the zoomed-in shot below (some gamma adjustment has been done on these pictures to bring out the supernumaries). Note also the blotches, caused by poking the camera out of a window during a shower -- water drops on the lens is not a good idea.

Les Cowley's Atmospheric Optics site has a good section on supernumeraries. If you're very lucky, you may spot secondary supernumeraries, outside the secondary bow.

[IMG_2713sg/jpg]

Supernumeraries detail [Leeds UK, 21 June 2004; Canon 10D]


Image details

 IMG_2712/JPG
IMG_2712/JPG
Taken : 7:30:40pm Mon 21 Jun 2004
Camera : Canon EOS 10D
Size : 3072 x 2048 pixels
Filesize : 2174 Kbytes
 shooting information
Exposure : 1/350 sec at ISO200
f : 11.00
Focal length : 24.00mm
Bias : -1
White balance : Auto
Metering : Pattern
Flash : Not fired
Orientation : x0,y0=left,top
Compression : 3
 canon information
Image number : 002-7528
Sequence number : 0
Quality : Fine
Image size : Large
Contrast : Normal
Saturation : Normal
Sharpness : Normal
Macro mode : 0
Self-timer duration : Off
Digital zoom : Off
Flash mode : Off
Flash : Not fired
Flash bias : 0
Easy-shoot mode : Manual
Focus mode : One-shot
Focus type : 2
Subject distance : 600
Focus mode 2 : 65535
AF point selected : 16385
AF point :  (0 focus points)
Metering mode : Evaluative
Exposure mode : Program
ISO : 0
White balance : Auto
Continuous drive mode : Single shot / timer
Image type : IMG:EOS 10D JPEG



© Chris & Lee 2006
All images are copyright and may not be reproduced without permission

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