Prinz Galaxy 35mm f/3.5

[ulf]

Last Update: 03 April 2021 agb/label/spacing

Finalized: Work in progress.

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Prinz Galaxy 35mm f/3.5

 

Manufacturer: unknown

Lens Label: PRINZ GALAXY 1:3.5 f=35mm No.<serial number>

Currently manufactured: No

 

Lens type: Manual focus, Prime, Wide Angle

Design: 5 elements in 5 groups

Focal length: 35mm

Aperture range: f/3.5 – f/22, Preset Manual, 8 blades

Optimal magnification *: ?

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

Mount: M42 x 1 thread**, others. The mount is internally mounted on a T2 mount structure that can be exchanged between lenses

Helicoid: Yes

Flange Focus distance: M42/45.46 mm,

Front filter: 46 mm x 0.75 mm

Introduction year: between 1969 or earlier

This lens produced: 1971

S/N of test object: 33858

** Mount of test object

 

Comment about types of PRINZ GALAXY 35/3.5: Over the years several different models of this lens were produced by different manufacturers. They have different shapes and optical performance, possibly including different UV-reach. For more info see the first link below. They belong to a big group of differently branded 35mm/3.5 lenses.

More info, on the web: https://www.apotelyt...soligor-catalog http://www.savazzi.n.../35soligor.html

 

Image of test object:

The shape of the rear lens mount has often proved to be a good hint of a possibly good UV-performance for similar lenses branded differently like Galaxy and Prinz Galaxy

Transmittance Summary

Definitions of the parameters below

• Range: This PRINZ GALAXY 1:3,5 f=35mm lens transmits from 1-67% in an increasing slope from 311nm to 400nm.
  
• T_VISmax (%) = 83%
  
• T_400nm (%) = 67%
  
• T_365nm (%) = 59%
  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) = 341nm
  
• λ_{UV HM400}(nm) = 335nm
  
• λ_{UV Zero}(nm) = 311nm
  
• These three values indicate that the lens is working for upper UV-B photography with some filters and the few for this, suitable cameras.
  

Spectral Transmission Graphs

UV-NIR, PRINZ GALAXY 1:3,5 f=35mm

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

 

UV, PRINZ GALAXY 1:3,5 f=35mm

UV-Log, PRINZ GALAXY 1:3,5 f=35mm

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 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.

 

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:

TBD

 

Lens distortion:

TBD

 

Chromatic Aberration in UV:

TBD

[Andrea B.]

That was interesting! The Prinz Galazy 35/3.5 has some reach. Nice.

I had wanted to remember to add some of Enrico's links for lenses like this so folks can read more. So thank you for doing that!

[Stefano]

This lens is practically identical to the Soligor 35 mm f/3.5. Very similar "look" and almost identical transmission. Here's a comparison: https://www.ultravioletphotography.com/content/index.php/topic/3412-relative-transmission-measurement-of-two-35mm-lenses-prinz-galaxy-and-soligor

[Andrea B.]

There are so many of these 35/3.5 lenses which look alike that one would go slightly nuts trying to list them all.

Here was an interesting collection which Alex H had: http://www.ultraviol...f-3535-presets/