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How to tell if its a radioactive Summicron?

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發表於 2018-11-20 18:00:39 |顯示全部樓層
I have been told by a dealer that you can tell it its a radioactive Summicron by simply looking at the aperture ring since the numbering and database is not exactly accruate....

if it says 2,8 - radioactive

if it says 2.8 - non radioactive
   

I don't have a gieger meter but any C Hing have the pleasure to walk me through this...
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發表於 2018-11-20 20:11:07 |顯示全部樓層
鏡片黃黃地
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發表於 2018-11-21 11:49:39 |顯示全部樓層
Serial number under 1 million.
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發表於 2018-11-21 15:48:19 |顯示全部樓層
Yes, the marking of “2,8” and “2.8” is one of the many ways to tell if it is a radioactive Summicron. Serial number is likely the easiest way to identify such a lens (see below). You may also look into more details on this web page (in Japanese):
http://www.sky.sannet.ne.jp/seven-ss/camera/summicron50.htm

920××× (1951)
921××× (1951)
922××x (1951)
993××× (1952)
994××× (1952)
995××× (1952)
1009××× (1952)
102×××x (1952)
104×××× (1952)   


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發表於 2018-11-21 15:56:42 |顯示全部樓層
tugend 發表於 2018-11-21 15:48
Yes, the marking of “2,8” and “2.8” is one of the many ways to tell if it is a radioactive Summi ...

Thank you !

I find it cinfusing sometimes too
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發表於 2018-11-21 17:14:08 |顯示全部樓層
tugend 發表於 2018-11-21 15:48
Yes, the marking of “2,8” and “2.8” is one of the many ways to tell if it is a radioactive Summi ...

what's confusing is when there's the 2,8 and 5,6 on the aperture ring but the serial # is out of the generally accepted serial range 9XX to 105X or 103X.The yellowish coating can be obscured by haze too... it is still confusing for me.
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