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Petri 135mm f/3.5 C.C. Petri

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#1 UlfW

    Ulf W

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  • Location: Sweden, Malmö

Posted 25 March 2021 - 15:20

Last Update: 03 April 2021 agb/label/title
Finalized: Work in progress.


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:

Attached Image: IMG_2739.jpg Attached Image: IMG_2741.jpg

Attached Image: IMG_2742.jpg

Attached Image: IMG_2743.jpg


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.
  • TVISmax (%) = 89%
  • T400nm (%) = 71%
  • T365nm (%) = 50%
  • λUV HMvis(nm) = 360nm
  • λUV HM400(nm) = 354nm
  • λUV 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.
Attached Image: Screen Shot 2021-03-19 at 08.52.48.png
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.
Attached Image: Screen Shot 2021-03-19 at 08.51.45.png
UV-Log, Petri 1:3.5 f=135mm C.C.
Attached Image: Screen Shot 2021-03-19 at 08.51.08.png
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.


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.

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

Image samples:
Ulf Wilhelmson
Curious and trying to see the invisible.