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Leitz 65mm f/4.5 Milar Macro

Lens
1 reply to this topic

#1 UlfW

    Ulf W

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Posted 18 January 2021 - 17:16

Finalized: Work in progress.
Last Update:
Leitz 65mm f/4.5 Milar Macro

Manufacturer: Ernst Leitz, Wetzlar
Manufacturer's lens designation: Milar f=6,5cm 1:4,5
Currently manufactured: No
Lens type: Macro Lens, Aristophot System
Focal length: 65mm
Aperture range: 2/4/6/12 (=reduction rate?), No click stops, Manual, 10 blades
Design: TBD
Flange Focus distance: -
Recommended magnification range: 1:1 - 7:1
Optimal magnification: TBD
Mount: M25 x 0.75
Sensor format/coverage: up to 90mm x 120mm, or more
Front filter: No
Lens coating: No
Introduction year: pre 1940?
S/N of test object: 35807

Working distance graphs:

Attached Image: WD Milar mm.png
Image of a Aristophot system

Image of the test object:

Attached Image: Milar65 1.jpg Attached Image: Milar65 3.jpg Attached Image: Milar65 5.jpg

Transmittance Summary
Definitions of the parameters below
  • Range: The Milar 65mm f:4.5 lens transmits 1-80% in an increasing slope from 308nm to 400nm.
  • TVISmax (%) = 90%
  • T400nm (%) = 80%
  • T365nm (%) = 73%
    This high percentage is an indicator for relatively short exposure time under typical UV-pass filtration peaking around 365 nm.
  • λUV HMvis(nm) = 332nm
  • λUV HM400 (nm) = 330nm
  • λUV Zero (nm) = 308nm
    These three values indicate that the lens is working well for upper UV-B photography with some filters and a few for this, suitable cameras.

Spectral transmission graphs:
UV-NIR, Milar 65mm 1:4.5
Attached Image: Milar65 Full.png
The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source.

UV, Milar 65mm 1:4.5
Attached Image: Milar65 UV.png

UV-Log, Milar 65mm 1:4.5
Attached Image: Milar65 UV Log.png
Numerical Spectra Data available: Yes

General comments about the UV-reach:
TBD


Filters and how to use them on this lens:
It is only 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.


Handling and focussing:
This lens needs to be combined with a helicoid or macro bellows to set desired magnification.
The original Aristophot System was big using long extensions.
The possible magnification useable is limited by how you can illuminate the motif, if the lens is used for reflected light photography

Flare:
TBD

Sharpness:
TBD

Lens distortion:
TBD

Chromatic Aberration / fringing in UV:
Rather big axial chromatic aberration. Can be improved considerably by focus stacking.
See more about this at the end in my first post about this lens. The fringing images are up scaled to 240%
https://www.ultravio...dpost__p__37525

Image samples:
UV:
image
Filter:

UV, Fringing:
image
Filter:

UV, Fringing 100%:
image
Filter:

VIS+NIR:
image
Filter:

NIR:
image
Filter: long pass 800nm

Edited by UlfW, 06 April 2021 - 07:46.

Ulf Wilhelmson
Curious and trying to see the invisible.

#2 UlfW

    Ulf W

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  • Location: Sweden, Malmö

Posted 19 January 2021 - 12:25

Updated with pictures of the tested lens
Ulf Wilhelmson
Curious and trying to see the invisible.