• Ultraviolet Photography

Novoflex 35mm f/3.5 Noflexar

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#1 UlfW

    Ulf W

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Posted 11 January 2021 - 12:45

Last Update: 03 April 2021 agb/label
Finalized: Work in progress.

Novoflex 35mm f/3.5 Noflexar

Manufacturer: Novoflex / Staeble
Lens Label: NOFLEXAR 1:3,5 / 35 NOVOFLEX <serial number>
Currently manufactured: No

Lens type: Manual focus, Prime, Wide Angle, Close-Up (to 1:2 with built-in click-stop extension)
Design: 4 elements in 4 groups
Focal length: 35mm
Aperture range: f/3.5 – f/16, Preset Manual, 10 blades

Recommended magnification range: Up to 1x without reversing the lens.
Optimal magnification *: ?
Sensor format/coverage: up to 24 mm x 36 mm

Mount: M42 x 1 thread, Exakta, Nikon, Zenit (COWEIT, EXWIT, NIKWEIT, ZENWEIT)
Helicoid: Yes
Flange Focus distance: M42/45.46 mm, Exakta/44.70 mm, Nikon F/46.50 mm, Zenit/47.58 mm
Front filter: 49 mm x 0.75 mm

Introduction year: between 1960 and 1969???
S/N of test object: 356594

Lens review (VIS), on the web: https://www.pentaxfo...r-f35-35mm.html
Lens brochure on the web: http://www.macrolens...Makro_en_02.pdf

Image of test object:

Attached Image: IMG_2419.jpg Attached Image: IMG_2420.jpg

Attached Image: IMG_2421.jpg Attached Image: IMG_2422.jpg

Transmittance Summary

Definitions of the parameters below
  • Range: The Noflexar 35/3.5 lens transmits 0-70% in an increasing slope from 322nm to 400nm.
  • TVISmax (%) = 89%
  • T400nm (%) = 74%
  • T365nm (%) = 58%
    This high percentage is an indicator for relatively short exposure time under typical UV-pass filtration peaking around 360 nm or when using 365 nm UV-LED illumination.
  • λUV HMvis(nm) = 352nm
  • λUV HM400(nm) = 347nm
  • λUV Zero(nm) = 321nm
  • These three values indicate that the lens is working even for some upper UV-B photography with some filters and a few for this, suitable cameras.

Spectral Transmission Graphs

UV-NIR, Novoflex 35mm f/3.5 Noflexar
Attached Image: Noflexar 35 Full.png
The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source.

UV, Novoflex 35mm f/3.5 Noflexar
Attached Image: Noflexar 35 UV.png

UV-Log, Novoflex 35mm f/3.5 Noflexar
Attached Image: Noflexar 35 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 49mm standard filter thread.

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.

An alternative, if space in the camera allows, is to putty-mount a filter directly against the lenses rear element mount ring. The rear lens element is recessed and thus safe and the ring provides a good reference plane for orienting the filter normal to the optic axis.

Handling and focussing:

Flare and sun-stars:

High according to net reviews. For UV ?

Lens distortion:

Chromatic Aberration in UV:

Image samples:

UV, Fringing:
image tba

UV, Fringing 100%:
image tba

image tba

image tba
Ulf Wilhelmson
Curious and trying to see the invisible.