Novoflex 35mm f/3.5 Noflexar

[ulf]

Last Update: 03 April 2021 agb/label

Finalized: Work in progress.

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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:

 

 

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.
  
• T_VISmax (%) = 89%
  
• T_400nm (%) = 74%
  
• T_365nm (%) = 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.
  
• λ_{UV HMvis}(nm) = 352nm
  
• λ_{UV HM400}(nm) = 347nm
  
• λ_{UV 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

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

 

UV-Log, Novoflex 35mm f/3.5 Noflexar

Numerical Spectra Data available: Yes

 

General comments about the UV-reach:

tba

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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.

 

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Handling and focussing:

TBD

 

Flare and sun-stars:

TBD

 

Sharpness:

High according to net reviews. For UV ?

 

Lens distortion:

TBD

 

Chromatic Aberration in UV:

TBD

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Image samples:

UV:

image

Filter:

 

UV, Fringing:

image tba

Filter:

 

UV, Fringing 100%:

image tba

Filter:

 

VIS+NIR:

image tba

Filter:

 

NIR:

image tba

Filter: