Industar-50 1:3,5 f=5cm P Review

Industar-50 1:3,5 f=5cm P. Review








Kj's picture
I have a similar copy...you are right it is nothing special ...but I like it for its low profile and being very light to carry...I measured it for radioactivity...putting the Geiger counter right over it IwaS getting a mean reading of 25 cpm...while the regular background reading was a reAding of 12 cpm. I then put a sheet of paper between the let a and Geiger counter and the reAdings went back to 12 cpm...I know this is an old post and may never be seen
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