• Ultraviolet Photography

Nikon 105mm f/5.6 EL-Nikkor: old metal version

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#1 UlfW

    Ulf W

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Posted 11 January 2021 - 12:26

Finalized: Work in progress.
Last Update:
Note: Additional information or links about this lens are welcomed and will be incorporated into the first post as time permits.

Nikon 105mm f/5.6 EL-Nikkor: old metal version

Manufacturer: Nikon
Manufacturer's lens designation: EL-NIKKOR 105mm f/5.6
Currently manufactured: No

Lens type: Enlarger lens for film up to 65mm x 90mm ( Ø130mm )
Design: 6 elements in 4 groups
Focal length: 105mm
Aperture range: f/5.6 – f/45, Manual, 8 blades

Format coverage: up to 65mm x 90mm ( Ø130mm ) at 0.2 x magnification
Recommended magnification range*: 0.1x – 0.5x.
Optimal magnification*: 0.2x
*Definitions reversed from normal enlarger definition, referring to the motif not the negative-plane

Mount: M39 x 26tpi thread + hidden 32.5 x 0.5mm thread behind a built in step ring.
Reverse mount: M39 x 26tpi thread, hidden under a cover ring outside the filter thread.
Helicoid: No
Flange focus distance: 90 mm
Front filter: 34.5 mm x 0.5 mm

Introduction year: pre 1960?
S/N of test object: 354015

Lens review (VIS), on the web:
Lens Manual on the web: http://www.savazzi.n...El-Nikkor_2.pdf

Transmittance Summary
Definitions of the parameters below
  • Range: The EL-Nikkor 105mm f/5.6: old metal version lens transmits 0-70% in an increasing slope from 316nm to 400nm.
  • TVISmax (%) = 92%
  • T400nm (%) = 89%
  • T365nm (%) = 75%
    This high percentage indicates a relatively short exposure time under typical UV-pass filtration peaking around 360 nm or when using 365 nm UV-LED illumination.
  • λUV HMvis(nm) = 345nm
  • λUV HM400 (nm) = 344nm
  • λUV Zero (nm) = 316nm
    These three values indicate that the lens is UV-capable into the upper UV-B range under appropriate filtration.

Image of test object:

Attached Image: IMG_2427.jpg Attached Image: IMG_2435.jpg Attached Image: IMG_2431.jpg

Spectral Transmission Graphs
UV-NIR, EL-NIKKOR 105mm f/5.6, old metal version
Attached Image: EL-NIKKOR 105 Old Metal Full.png
The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source.

UV, EL-NIKKOR 105mm f/5.6, old metal version
Attached Image: EL-NIKKOR 105 Old Metal UV.png
UV-Log, EL-NIKKOR 105mm f/5.6, old metal version
Attached Image: EL-NIKKOR 105 Old Metal UV Log.png
Numerical Spectra Data available: Yes

General comments about the UV-reach:

Filters and how to use them on this lens:
The front filter thread is rather odd, but a suitable adapter can be found at RafCamera:

It is also possible to use rear mounted filters, either in lens mount adapters for mirrorless cameras like Sony A-series etc, or placed directly in the camera.

Handling and focussing:
This EL-Nikkor 105/5.6 must be used with a helicoid or macro bellows to set desired magnification. The lens's long FFD easily permits focus to infinity with careful sizing of the helicoid or bellows.

Flare and sun-stars:


Lens distortion:

Chromatic Aberration / fringing in UV:

Image samples:

UV, Fringing:

UV, Fringing 100%:



Edited by UlfW, 06 April 2021 - 06:45.

Ulf Wilhelmson
Curious and trying to see the invisible.