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I am looking for cheap M42 lenses to play with different focal lenghts. I have a adapter for my Fuji X-E2. I have the 27mm pancake as primary lens, a Helios 44 too.
In my searches I've found some "Aiistar" lenses. But can't find any info online.
Does anybody know this brand? Also, which m42 manufacturer I should try-out?