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Soligor 35mm f/3.5 (KA)

Lens
3 replies to this topic

#1 UlfW

    Ulf W

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Posted 29 April 2021 - 12:27

Finalized: Work in progress.
Last Update:
Note: Additional information or links about this lens are welcomed and will be incorporated into the first post as time permits.


Soligor 35mm f/3.5 (KA)

Manufacturer: Kyoei Acall
Manufacturer's lens designation: Soligor f = 35mm 1:3,5 No. KA<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: KA 70028
** Mount of test object

Comment about types of Soligor 35/3.5 (KA): 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.
More info, on the web: https://www.apotelyt...soligor-catalog http://www.savazzi.n.../35soligor.html


Image of test object:

Attached Image: IMG_2788.jpg Attached Image: IMG_2789.jpg Attached Image: IMG_2790.jpg
The shape of the rear lens mount shape this lens have, 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 Soligor 1:3,5 f=35mm (KA) transmits from 1-70% in an increasing slope from 310nm to 400nm.
  • TVISmax (%) = 87%
  • T400nm (%) = 70%
  • T365nm (%) = 62%
    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) = 344nm
  • λUV HM400(nm) = 335nm
  • λUV Zero(nm) = 310nm
  • 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, Soligor 1:3,5 f=35mm
Attached Image: full.png
The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source.

UV, Soligor 1:3,5 f=35mm
Attached Image: uv.png
UV-Log, Soligor 1:3,5 f=35mm
Attached Image: log.png
Numerical Spectra Data available: Pending

General comments about the UV-reach:
tba

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.


Handling and focussing:
TBD

Flare and sun-stars:
TBD

Sharpness:
TBD

Lens distortion:
TBD

Chromatic Aberration in UV:
TBD
Ulf Wilhelmson
Curious and trying to see the invisible.

#2 Andrea B.

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Posted 30 April 2021 - 17:12

Ulf, from where is the information that this Soligor was made by Kyoei Acall?
Andrea G. Blum
Often found hanging out with flowers & bees.

#3 UlfW

    Ulf W

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Posted 30 April 2021 - 18:55

The KA in the serial number is supposed to be an indication about that according to the first link in the post:
https://www.apotelyt...soligor-catalog
It is partly about 28mm lenses, but I think it is reliable.
Ulf Wilhelmson
Curious and trying to see the invisible.

#4 Andrea B.

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Posted 03 May 2021 - 16:49

Thank you. I was just curious. :smile:
Andrea G. Blum
Often found hanging out with flowers & bees.