Ultra Micro Nikkor 28mm F1.7e Spring Ephemeral

Spring Ephemeral Ultra-Micro-Nikkor 28mm F1.7e

Ultra-Micro-Nikkor 28mm F1.7e

One of the more fantastic and rare lens for the Ultra-Micro-Nikkor series.
The Ultra-Micro-Nikkor 28mm F1.7e consisted of ten elements set in a heavy weight and black painted plain barrel with L39 Leica thread. We called "Black Cylinder".
The Ultra-Micro-Nikkor 28mm F1.7e used 40.5mm accessories. A Nikon 40.5mm reversing adapter is just fit to her.
You can see very beautiful and mysterious red coating on the lens.

Specifications

Focal length 28.7mm
Max. aperture f/1.7
Lens construction 10 elements, 8 groups
Standard magnification 1/10X
Standard wavelength 546.1 milli-micron (e-line)
Vignettings 0 %
Distortion -0.005 %
Aerical resolving power 700 lines/mm (8mm circle)
Aerical resolving power 800 lines/mm (6mm circle)
Image area 8mm circle
Subject area 80mm circle
Overall working distance 315mm
Weight 465 g

Black Cylinder Ultra-Micro-Nikkor 28 mm F1.7e