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[UlfW]

Finalized: Work in progress.
Last Update:

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Staeble-Werk 35mm f/3.5 Staeble-Lineogon

Manufacturer: Staeble-Werk
Manufacturer's lens designation: STABLE-LINEOGON 1:3.5 / 35
Currently manufactured: No
Lens type: Manual focus, Prime, Wide Angle
Focal length: 35mm
Aperture range: f/3.5 – f/16, Manual, 10 blades
Design: 4 elements in 4 groups
Flange Focus distance: Mount dependable
Recommended magnification range: Up to 1x without reversing the lens.
Optimal magnification*: ?
Mount: M42 x 1.0, M39 x1.0**
Sensor format/coverage: up to 24mm x 36mm
Front filter: 40.5 mm x 0.75 mm
Introduction year: early 1960?
S/N of test object: 737665

* Optical design is said to be identical to the Noflexar 35/3.5. See that lens in the UV Lens Data for more information, if that rumor is true.
**Mount of test object

Lens review (VIS), on the web: http://forum.mflense...paxette-t69839.

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Image of test object:

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Transmittance Summary
See definitions at https://www.ultravio...on-parameters/.

• Range: The STABLE-LINEOGON 1:3.5 / 35 lens transmits 0-68% in an increasing slope from 320nm to 400nm.
  
• T_VISmax (%) = 89%
  
• T_400nm (%) = 68%
  
• T_365nm (%) = 54%
  This moderate to high percentage is an indicator for reasonable exposure time under typical UV-pass filtration peaking around 365 nm.
  
• λ_{UV HMvis}(nm) = 354nm
  
• λ_{UV HM400} (nm) = 345nm
  
• λ_{UV Zero} (nm) = 320nm
  These three values indicate that the lens is working even for some limited upper UV-B photography with some filters and a few for this, suitable cameras.

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Spectral transmission graphs:
UV-NIR, Staeble-Lineogon 35mm f/3.5

The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source.

UV, Staeble-Lineogon 35mm f/3.5


UV-Log, Staeble-Lineogon 35mm f/3.5

Numerical Spectra Data available: Pending

General comments about the UV-reach:
This lens is as said above supposed to be similar to the Noflexar 35/3.5, however the transmission-levels are not identical for my two lenses. The UV cut-on is very similar.
The difference, where the Noflexar is the better one of the two might be due to differences in the coatings.
I think my Staeble-Lineogon is older and coating technology improved much in the sixties.

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Filters and how to use them on this lens:
The front filter thread is 40.5mm standard filter thread. A step-up filter ring might be needed.

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.

My Omega 330W80 Improved Ø25mm, is mounted in a 27mm-filter ring and works well to mount as it is.

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Handling and focussing:
This lens has a focusing helicoid that smoothly turns almost a full turn for focus at infinity to around 1m. To focus closer external bellows, focusing helicoids or extension rings are needed.


Flare and sun-stars:
TBD

Sharpness:
High according to net reviews. For UV ?

Lens distortion:
TBD

Chromatic Aberration / fringing in UV:
TBD

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Image samples:
UV:
image
Filter:

UV, Fringing:
image
Filter:

UV, Fringing 100%:
image
Filter:

VIS+NIR:
image
Filter:

NIR:
image
Filter: long pass 800nm

Edited by UlfW, 14 January 2021 - 08:47.