Petri 135mm f/3.5 C.C. Petri

[ulf]

Last Update: 03 April 2021 agb/label/title

Finalized: Work in progress.

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Petri 135mm f/3.5 C.C. Petri

 

Manufacturer: Petri Camera Company Ltd,. Inc.

Lens Label: Petri Camera Co., Inc. C.C. Petri 1:3.5 f=135mm No.<serial number>

Introduction year: 1963

Currently manufactured: No

 

Lens type: Manual focus, prime, short elephoto

Design: 4 elements in 3 groups

Focal length: 135mm

Aperture range: f/3.5 – f/22, 6 blades, can be locked for manual stopped down mode

Magnification range: tbd. Closest focus 1.5m.

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

 

Mount: Petri Bayonet

Flange focal distance: Petri Bayonet-standard 45.50 mm

Front filter: 52 mm x 0.75 mm

 

S/N of test object: 53621

 

Image of test object:

 

 

 

Transmittance Summary

Definitions of the parameters below

• Range: The Petri 1:3.5 f=135mm C.C. - lens transmits 1-71% in an increasing slope from 330nm to 400nm.
  
• T_VISmax (%) = 89%
  
• T_400nm (%) = 71%
  
• T_365nm (%) = 50%
  

• λ_{UV HMvis}(nm) = 360nm
  
• λ_{UV HM400}(nm) = 354nm
  
• λ_{UV Zero}(nm) = 330nm
  These three values indicate that the lens is only working for UV-A photography.
  

Spectral Transmission Graphs

UV-NIR, Petri 1:3.5 f=135mm C.C.

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

 

UV, Petri 1:3.5 f=135mm C.C.

UV-Log, Petri 1:3.5 f=135mm C.C.

Numerical Spectra Data available: Yes

 

General comments about the UV-reach:

The lens reaches reasonably deeply into UV for a 135mm lens. This reach will be enough for most UV-photography either in sunlight or using a UV-converted flash as the light source together with a typical UV-pass filter-stack or a Baader U.

 

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Filters and how to use them on this lens:

The front filter thread is a 52mm standard filter thread. It is also possible to use rear mounted filters placed either in lens mount adapters or directly in the camera.

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Handling and focusing:

Due to the long 45.50 mm flange focal distance this lens will be possible to mount with lens mount adapters and focus at infinity with some DSLRs.

 

Sharpness:

TBD

 

Lens distortion:

TBD

 

Chromatic Aberration in UV:

TBD

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Image samples: