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Leitz 100mm f/4.5 Milar Macro

Lens
2 replies to this topic

#1 UlfW

    Ulf W

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Posted 18 January 2021 - 17:27

Finalized: Work in progress.
Last Update:
Leitz 100mm f/4.8 Milar Macro

Manufacturer: Ernst Leitz, Wetzlar
Manufacturer's lens designation: Milar f=10cm 1:4,8
Currently manufactured: No
Lens type: Macro Lens, Aristophot System
Focal length: 100mm
Aperture range: 3/6/12/24/48/96 (=reduction rate?), No click stops, Manual, 10 blades
Design: TBD
Flange Focus distance: -
Recommended magnification range: 1:1 - 5:1.
Optimal magnification: TBD
Mount: M33 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: 36808

Working distance graphs:

Attached Image: WD Milar mm.png

Image of test object:

Attached Image: Milar100 1.jpg Attached Image: Milar100 3.jpg Attached Image: Milar100 2.jpg

Transmittance Summary
Definitions of the parameters below
  • Range: The Milar 100mm f:4.8 lens transmits 1-85% in an increasing slope from 313nm to 400nm.
  • TVISmax (%) = 94%
  • T400nm (%) = 85%
  • T365nm (%) = 74%
    This high percentage is an indicator for relatively short exposure time under typical UV-pass filtration peaking around 365 nm.
  • λUV HMvis(nm) = 340nm
  • λUV HM400 (nm) = 337nm
  • λUV Zero (nm) = 313nm
    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 100mm f:4.8
Attached Image: Milar100 Full.png
The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source.

UV, Milar 100mm f:4.8
Attached Image: Milar100 UV.png

UV-Log, Milar 100mm f:4.8
Attached Image: Milar100 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 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 transversal chromatic aberration. Can be improved considerably by focus stacking.

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 - 07:49.

Ulf Wilhelmson
Curious and trying to see the invisible.

#2 UlfW

    Ulf W

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Posted 19 January 2021 - 12:23

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

#3 UlfW

    Ulf W

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  • Location: Sweden, Malmö

Posted 23 February 2021 - 06:47

Andrea,

Excellent with the addition of the subsections in the UV Lens Technical Data section.
I have spotted a mistake for a small group of lenses placed in the wrong subsection.

All three Milars are misplaced.
They have no helicoid and should be placed in the section for UV Lenses: Non-helicoidal.
Ulf Wilhelmson
Curious and trying to see the invisible.