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UltravioletPhotography

Steinheil München 135mm f/4.5 Cassarit


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Last Update:

Finalized: Work in progress.


Steinheil München 135mm f/4.5 Cassarit

 

Manufacturer: Steinheil München

Manufacturer's lens designation on the front ring: Steinheil-Cassarit 4.5/135mm <serial number>

Currently manufactured: No

Lens type: Manual focus, Prime, Short Telephoto

Design: 3 elements in 3 groups

post-150-0-51847200-1620295566.png

Focal length: 135mm

Aperture range: f/4.5 – f/32, Preset Manual, 15 blades

Focus Range: 1.5m to infinity

Sensor format/coverage: 24 mm x 36 mm

Mount: M42 x 1 thread**, others.

Helicoid: Yes, in the front part of the lens

It is possible to separate the front part from the rear tube part by a m39 x 1 thread and mount it on a suitable bellows or extension tube.

Flange Focus distance: M42/45.46 mm

Front filter: 49 mm x 0.75 mm

Introduction year: around 1967

This lens produced: tbd

S/N of test object: 2294118

** Mount of test object

Image of test object:

post-150-0-30920400-1620295844.jpg post-150-0-74236300-1620295855.jpg

 

post-150-0-47247000-1620295877.jpg

Transmittance Summary

Definitions of the parameters below

  • Range: This Steinheil-Cassarit 4.5/135mm transmits from 1-90% in an increasing slope from 317nm to 400nm.
  • TVISmax (%) = 93%
  • T400nm (%) = 90%
  • T365nm (%) = 76%
    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) = 345nm
  • λUV HM400(nm) = 344nm
  • λUV Zero(nm) = 317nm
  • These three values indicate that the lens is working for shorter wavelength UV-A photography with some filters and the few for this, suitable cameras.

Spectral Transmission Graphs

UV-NIR, Steinheil-Cassarit 4.5/135mm

post-150-0-95988400-1620296817.png

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

 

UV, Steinheil-Cassarit 4.5/135mm

post-150-0-20727000-1620296828.png

 

UV-Log, Steinheil-Cassarit 4.5/135mm

post-150-0-69035200-1620296836.png

Numerical Spectra Data available: Pending

 


Filters and how to use them on this lens:

The front filter thread is a 49mm standard filter thread.

 


Handling and focussing:

TBD

 

Flare and sun-stars:

TBD

 

Sharpness:

TBD

 

Lens distortion:

TBD

 

Chromatic Aberration in UV:

TBD

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