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The small hole in the barrel appears to be an access
hole to a small set screw that allows adjusting the focus
scale. The head of the set screw can slightly interfere
with sliding a 37 mm slip-on attachment into the groove.
Full EXIF Info | |
Date/Time | 29-Aug-2012 17:59:25 |
Make | Canon |
Model | Canon EOS 40D |
Flash Used | No |
Focal Length | 100 mm |
Exposure Time | 1/10 sec |
Aperture | f/16 |
ISO Equivalent | 800 |
Exposure Bias | 0.00 |
White Balance | 0 |
Metering Mode | |
JPEG Quality | basic (1) |
Exposure Program | 0 |
Focus Distance |