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Leitz 30mm f/4.5 Milar Macro

Lens
2 replies to this topic

#1 UlfW

    Ulf W

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Posted 18 January 2021 - 18:08

Finalized: Work in progress.
Last Update:
Leitz 30mm f/4.5 Milar Macro

Manufacturer: Ernst Leitz, Wetzlar
Manufacturer's lens designation: Milar f=30mm 1:4.5
Currently manufactured: No
Lens type: Macro Lens, Aristophot System
Focal length: 30mm
Aperture range: 2/6/12 (=reduction rate?), No click stops, Manual, 10 blades
Design: TBD
Flange Focus distance: -
Recommended magnification range: TBD.
Optimal magnification: TBD
Mount: RMS, Microscope thread
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: 25246

Working distance graphs:

Attached Image: WD Milar mm.png

Image of test object:

Attached Image: Milar30 1.jpg Attached Image: Milar30 2.jpg Attached Image: Milar30 4.jpg

Transmittance Summary
Definitions of the parameters below
  • Range: The Milar f=30mm f:4.5 lens transmits 1-78% in an increasing slope from 308nm to 400nm.
  • TVISmax (%) = 87%
  • T400nm (%) = 78%
  • T365nm (%) = 69%
    This high percentage is an indicator for relatively short exposure time under typical UV-pass filtration peaking around 365 nm.
  • λUV HMvis(nm) = 336nm
  • λUV HM400 (nm) = 334nm
  • 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 30mm 1:4.5
Attached Image: Milar 30 Full.png
The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source.

UV, Milar 30mm 1:4.5
Attached Image: Milar30 UV.png

UV-Log, Milar 30mm 1:4.5
Attached Image: Milar30 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:
TBD

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 - 07:43.

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 dabateman

    Da Bateman

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Posted 23 February 2021 - 23:16

Ulf I got a Milar 50mm f4.5 and I think it might have similar UV transmission as this 30mm. It too is in RMS thread.
It will focus to infinity mounted in front of rms to m52 adapter on a 12-19mm helicoid on a dual m42/ C-mount m43rds adapter.
For fun today I tested it reverse mounted. And it will focus to infinity with about 20mm of helicoid extension. So a 17-31mm helicoid is needed for a micro four thirds camera. This allows for a rms to 25mm adapter and 25mm to 52mm step up ring to be used with regular filters.

You may want to try reverse mounting your other Milar lenses. Only disadvantage is to change the aperture you need to unscrew the lens adapter. But I use a near fixed aperture most of the time.

Edited by dabateman, 23 February 2021 - 23:20.