Two come to mind, one I use frequently and one I almost never use.
First the one I use:
KMZ Helios 44M 58/2
It was cheap Soviet junk at the time*, but I was lured by photos I had seen and the sub-$20 price I paid. Build and use is on the utilitarian side of things, but I still totally resonate with this tool.
And then the one that sits on the shelf:
Tamron 70-210/4-5.6 (158A)
I bought this one for $20 to get its like-new P/KA adapter. This lens has wretched build and is not the least bit pleasant to use. The sound and feel of the focus ring are like fingernails on a chalkboard. OTOH, it is admirably compact**, weighs nothing, has continuous focus to 1:4, and performs much better than expected at f/8 and narrower.
No, I have no photos to share despite my being rather surprised by its actual performance.
Steve
* That was about ten year ago, before the performance characteristics of the Helios 44 series and other Soviet lenses became well-know.
** 7.9cm min. length (12.3cm full extended) x 6.5cm diameter, with 52mm filter thread.
Last edited by stevebrot; 06-04-2018 at 05:50 PM.