File:50mm f-1.4 S-M-C Takumar (Radioactive) (5919660366).jpg

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-- 50mm f/1.4 S-M-C Takumar (Radioactive)

This lens has a glass element in the rear group (reported to be the one next to the aperture diaphragm) containing radioactive thorium oxide.

Taken with a Canon T2i/550D and Canon 100mm f/2.8 Macro lens at f/6.3. 50 1/15-second exposures at ISO100 in a focus stack (DoF stack) were combined with Zerene Stacker in DMAP mode. The exposures were spaced by pressing the ">" button on the EOS utility live-view screen. This is a 50% crop of the original image.

See: www.youtube.com/watch?v=3ozOMssiP2E for radioactivity measured with a geiger counter.

De-yellowing process for this lens: here
Date
Source 50mm f/1.4 S-M-C Takumar (Radioactive)
Author s58y

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by s58y at https://flickr.com/photos/45032885@N04/5919660366. It was reviewed on 7 May 2016 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

7 May 2016

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current09:41, 7 May 2016Thumbnail for version as of 09:41, 7 May 20161,500 × 1,600 (692 KB)Fünfstein (talk | contribs)Transferred from Flickr via Flickr2Commons

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