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Bellows Types 2, 2A
These are the original bellows for the Nikon F-bayonet mount. The first bellows units ever made were in the S-bayonet (rangefinder) mount and were known as "Bellows 1". Both the front and rear standards may be moved; the front standard moves along a geared track via a rotating knob, and the rear standard is slid back and forth along the rails after unlocking a lever. The extension is continuously variable from 51.6 to 184mm on the Bellows 2 and 54.6 to 187mm on the 2a. Incidentally, these bellows have serial numbers.
It has no focusing device of its own - it is focused by the extension or contraction of the bellows focusing attachment, so, please DON'T mistaken it as with other normal Close-up Micro-Nikkor lenses. The manually preset lens diaphragm can be stopped down to f/32 with 1/3 intermediate click-stop settings. (Black dots between the inscribed f-numbers indicate the two intermediate settings between the inscribed f-numbers).
With the long focal length of 105mm, the lens offers natural reproduction of perspective, while affording the photographer greater working distance for better subject handling and illumination, should you require it.
The lens has a similar design with other lenses introduced at the same period, in a silver-chrome lens barrel and an aperture ring in a black-finish scalloped design. Some versions in black was also believed to have been seen. Further, two known versions that have its lens data engraved outside the filter ring while another was engraved inside (See picture at left). The lens was also believed not to have been multicoated.