General info:
ModelCanon PowerShot A570 IS
Basic shot info:
Focal Length7.9 mm; equivalent: 39 mm
Aperture ValueF3.5
White BalanceAuto white balance
FlashFlash did not fire, auto
Metering ModeMulti-segment
Shutter Speed Value1/50 sec
ISO Speed Ratings200
Advanced shot info:
Exposure Bias Value0 EV
Exposure Time0.02 sec
Exposure ModeAuto exposure
Max Aperture ValueF3.2
Exif-related info:
Exif Version2.20
Exif Image Width600 pixels
Exif Image Height480 pixels
Color SpacesRGB
CompressionJPEG (old-style)
User Comment

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The Elan hub
This picture may not do justice to the size of the hub. The left flange is 105 mm in diameter, as large as on an old Sturmey-Archer Dynohub. The right flange is 132 mm in diameter. The sprocket was available in one size only -- 26 teeth. Still, the hub demanded a small chainwheel, typically 38 teeth, because of the large increase ratio to the top gear. The spoke holes are oversize, 2.6 mm, to make it easier to get spokes in the left flange past the right flange.
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Photos and captions by John S. Allen
unless otherwise indicated.