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[M42] ISCO-GOTTINGEN WESTAR 100mm/F4 LENS MADE IN GERMANY | eBay
I have this little beauty in Exakta mount, easily modded to PK. This one is M42 and I'm tempted... but no, someone else deserves it. Light (mine is 170g), slow, sharp, full of character, a real joy. Don't let it escape your clutches!