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What is this?

What is this?

Used in the 1970s and 1980s...
Now used again for macro.

Photo taken on 25 February 2019 (© ralf.st / Flickr)

Related tags :
 makro, what is this?, ralf stamm, monochrom, sigma 105 mm, schwarzweiss, blackandwhite, monochrome, kugelkopf, macro mondays, 2019, macro

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