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Owner reviews: Helios-103 53 mm f/ 1.8
Sharpness even wide open; Bokeh which may be subjective but I love from this lens once you learn it.
Adapters are a problem. The lens may unscrew and fall out of the hellicoid as you focus closely. I built my own adapter which solved that problem.
A truely fantastic little lightweight lens that really delivers. If I could only have one lens for less then $100 it would be this one for sure. It is so sharp that you will need to pay hundreds of dollars just to match this lens. Buy one if you see it - and they are cheap.