CRT Nikkor 55mm F1.2

The CRT Nikkor is a relatively high resolution lens for display of data from oscilloscope or other CRT traces.
Transmission of P-11 phosphor traces is 95 percent; for P-20, 100 percent.
Aberrations are corrected at its standard magnification of 1/5X, and the lens is designed for use within a very narrow range around that magnification.
Within the 24x36 mm film, vignetting is insignificant in CRT reproduction applications.
It should be noted that at its standard magnification of 1/5X the nominal F1.2 speed of the lens is reduced to F1.4.
The CRT Nikkor has an extra-long, Leica-mount thread and is supplied with a jum nut.

This lens has 2 names.
One is Oscillo-Nikkor 55mm F1.2 in 1964.
Anoter is CRT Nikkor 55mm F1.2 renamed in 1970's. (Cathode-Ray Tube, CRT)

A Left lens is the CRT Nikkor 55mm F1.2 Early model Named Nippon Kogaku Japan
A right lens is the CRT Nikkor 55mm F1.2 Later model Named Nikon with red point M=1/5

Specifications

Focal length 54.3mm
Max. aperture f/1.2
Min. aperture f/11
Lens construction 8 elements, 6 groups
Standard magnification 1/5.5X - 1/4X
Standard wavelength 400 - 650 milli-micron
Vignettings 0 %
Distortion 0.14 %
Resolution 250 lines/mm
Image area 24mmX36mm
Overall working distance 417.1mm
Weight 385 g

Resolution

Recorded for full CRT screen; high density target on clear background, filling full acceptance cone of lens with flare producing illumination.
High density background target and High Contrast Copy Film, up to 250 lines/mm possible.

Mechanical Mount Available

Barrel,extra long Leica thread with jam nut.
You can mount the lens on your Nikon camera with L-F ring.
Moreover, if you have the Leica ring, the mount can be done also to Canon, Minolta, Miranda, ALPA and Zunow.