Image MC 135mm f/2.8 M42
This was another bargain lens that I have been unable to find a lot about, but it produces very good results. It struggles with CA and small loss of contrast wide open, but stopped down to f/4 because extremely sharp and contrasty. It is a flexible lens that balances well on a modern DLSR and I have kept it despite trying and selling many other M42 lens.
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