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I have Helios 44M4, which is converted to Nikon mount and is adjusted to infinity. The only inconvenience is the measurement of the exposure through Live View.
A friend gave me MIR for a while, to try. It works only with macrorings. I plan to buy another Helios for the macro. I really liked the effect of bokeh and depth of field in Helios!
Thank you for your interest in my blog!