Leitz 100mm f/4.5 Milar Macro

[ulf]

Finalized: Work in progress.

Last Update:

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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:

Image of test object:

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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.
  
• T_VISmax (%) = 94%
  
• T_400nm (%) = 85%
  
• T_365nm (%) = 74%
  This high percentage is an indicator for relatively short exposure time under typical UV-pass filtration peaking around 365 nm.
  
• λ_{UV HMvis}(nm) = 340nm
  
• λ_{UV HM400} (nm) = 337nm
  
• λ_{UV 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.
  

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Spectral transmission graphs:

UV-NIR, Milar 100mm f:4.8

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

 

UV-Log, Milar 100mm f:4.8

Numerical Spectra Data available: Yes

 

General comments about the UV-reach:

TBD

 

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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.

 

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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.

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Image samples:

UV:

image

Filter:

 

UV, Fringing:

image

Filter:

 

UV, Fringing 100%:

image

Filter:

 

VIS+NIR:

image

Filter:

 

NIR:

image

Filter: long pass 800nm

[ulf]

Updated with pictures of the tested lens

[ulf]

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.