Durst Setopia 2839 Photo Enlarger Lens Board w/ Schneider-Kreuznach Componon

Description

Durst Setopia 2839 Photo Enlarger Lens Board w/ Schneider-Kreuznach Componon 1:4/50
I'm not exactly sure what this is or what it does, so please examine the pictures and make sure to ask any questions BEFORE buying. Please do not assume I have described everything that is important about this item.
Since the writing is scratched off, I'm not positive it is a 2839, but I compared it to pictures of other ones, and the smaller opening appears to measure 39mm across, so thats my best guess.
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