Topcor.R 1:2.8 f=300mm 341286 (modified for Nikon F mount)
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- «Tokyo Kogaku Japan», Production date 196?
- Announced 1958, serial numbers reported from 340xxx (f=30cm) to 341xxx (f=300mm)
- Glossy black enamel finish
- 5 elements in 3 groups, Picture angle 8.2°
- Built-in two-section telescopic lens hood
- Black front ring, no filter threads
- Built in tripod mount
- Preset aperture, exposure meter not coupled
- Aperture scale f/2.8 to f/22, 16 iris blades
- Large scalopped focusing ring
- Distance scale graduated in meters and feet from 4.5m (14 ft.) to infinity (∞)
- No «LENS MADE IN JAPAN» engraving
- Drop-in filter holder, «SL39 3C UV IX»
- 39mm screw-in UV filter
- Rotating Nikon F bayonet mount, 3 bayonet screws
- Dimensions approx. 135mm ∅ x 393mm
- Weight approx. 3300g
- Tokyo Kogaku slip-on front lens cap
- Nikon LF-1 rear lens cap
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