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Asahi 85mm f/4.5 Ultra-Achromatic-Takumar (just starting, incomplete)

2 replies to this topic

#1 Andrea B.

    Desert Dancer

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Posted 22 March 2021 - 20:20

Asahi 85mm f/4.5 Ultra-Achromatic-Takumar

Manufacturer: Asahi Optical Co., LTD, Tokyo, Japan
Lens Label:
Currently Manufactured: No
Note: about the 2 models. look up history.

Lens Type: short telephoto, manual focus, aperture preset
Lens Design: 5 elements, 3 fluorite + 2 artificial quartz
Focal Length: 85 mm
Aperture Range: 4.5, 8.0, 11.0, 22.0
Correction: 220 - 1100 nm
This lens could be focused in Visible light prior to adding a UV-pass or IR-pass filter. In digital Live View, focus can usually be made on screen if the aperture is set wide open.

Format Coverage: 29°
Minimum Distance: .6 m = 2 ft
Magnification:

Mount: M42 x 1 screw mount
Helicoid: Yes
Flange Focal Distance (FFD): 45.46 mm
The lens can easily be used on any camera with an FFD shorter than 45.46 mm by means of a mount adapter.
Front Filter: 49 mm

Sharpness:
Andrea G. Blum
Often found hanging out with flowers & bees.

#2 dabateman

    Da Bateman

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  • Location: Maryland

Posted 23 March 2021 - 03:38

This is one of my favorite UV lenses.
But oddly it may (or my copy at least) has a hot spot at 254nm. Will see if I can prove this definitively. This is why film and digital UVC will loose contrast with UVC imaging.
Yes UVC imaging is rare, but so is this lens.

#3 UlfW

    Ulf W

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Posted 24 March 2021 - 06:09

A very rare and normally expensive lens.

Someone got lucky here a few years ago:
https://buyee.jp/ite...ng_hisotry_list

I found this listing one week after it ended. :angry:
If the winner was ignorant of the real value I could have won auction.
Ulf Wilhelmson
Curious and trying to see the invisible.