Galaxy 135mm f/3.5 Telephoto

[ulf]

Last Update: 03 April 2021 agb/label/title

Finalized: Work in progress.

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Galaxy 135mm f/3.5 Telephoto

 

Manufacturer: TBD

Lens front ring label: GALAXY TELEPHOTO 1:3,5 f=135mm No.<serial number>

Currently manufactured: No

 

Lens type: Manual focus, Prime, Short Tele Lens

Design: TBD

Focal length: 135mm

Aperture range: f/3.5 – f/22, Preset Manual, 16 blades

Focus Range: 2m to infinity

Sensor format/coverage: up to 24 mm x 36 mm

Mount: M42 x 1 thread**, others.

Helicoid: Yes

Flange Focus distance: M42: 45.46 mm

Front filter: 46 mm x 0.75 mm

Introduction year: before 1965

This lens produced: TBD

S/N of test object: H80475

** Mount of test object

 

Image of test object:

Transmittance Summary

Definitions of the parameters below

• Range: This Galaxy 135mm f/3.5 transmits from 1-69% in an increasing slope from 331nm to 400nm.
  
• T_VISmax (%) = 85%
  
• T_400nm (%) = 69%
  
• T_365nm (%) = 50%
  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) = 358nm
  
• λ_{UV HM400}(nm) = 354nm
  
• λ_{UV Zero}(nm) = 331nm
  
• These three values indicate that the lens is marginally working for some shorter wavelength UV-A photography with some filters and the few for this, suitable cameras.
  

Spectral Transmission Graphs

UV-NIR, Galaxy 135mm f/3.5

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

 

UV, Galaxy 135mm f/3.5

UV-Log, Galaxy 135mm f/3.5

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 a 46mm 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.

 

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Handling and focussing:

TBD

 

Flare and sun-stars:

TBD

 

Sharpness:

TBD

 

Lens distortion:

TBD

 

Chromatic Aberration in UV:

TBD