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Amazing mechanics. Buttery smooth focusing even in my used&abused copy (see comments)
Very long throw allows for precise focusing
Don't flare, no need for additional shade
Very close focusing + hight magnification w/o extention ring
Found in a thrift shop with scrathed off paint and dings attached to a covered in soil battered Pentax camera . Out of curiosity turned the focusing ring and couldn't believe how smooth it moved. Felt as if it had been sitting new in the box for 60 years in an air-conditioned room. Had some dust and light fungus inside but one can't go wrong for $10. Checked online and found out that I got a famous 1:1 version. Great pics on Fuji X-E2 even "as is". Going to clean the glass, if I manage to remove the front "funnel"