A cased Octant by Wm. R. Robertson
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A working copy of a 18th c. Octant featuring jointed ebony frame. engraved ivory scales, brass, glass and mirror optics.
Copyright
© Wm. R. Robertson
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4
Photo Information
- Taken with NIKON E885
- Focal Length 8 mm
- Exposure Time 8403361/100000000
- f Aperture f/2.8
- ISO Speed 100