One great thing about the M42 mount is that there were a lot of lenses made for it. First there was the companies who made these lenses for their own cameras, and then there were the third-party lens makers. So today there are vast numbers of these lenses and they are mostly affordable. Now since they were originally made to use with film cameras that may not seem like a big deal in this time of digital dominance. However it is easy to use this vast supply of often very good quality lenses with almost any digital camera that that can use interchangeable lenses. And with the prices of these lenses still being fairly low it is easy to get a nice assortment of M42 lenses for the same amount of money that a new lens for you digital camera would cost. At least I know that is the case with the Canon EF lenses.
The Auto Cosinon f/1.8 50mm was one of the standard lenses offered with the Argus/Cosina STL 1000.
The Argus/Cosina STL 1000 is one of my favorite classic all mechanical SLRs. So I was interested to seen how its lens would work with a digital camera. For the most part I was pleased by the results and will let the images speak to that issue.
The lens at f/1.8
Again at 1.8
I like the way this lens handles color.
If at this point you would like to see more here is a gallery. The Auto Cosinon f/1.8 50mm is one of the least expensive of what I think are the good quality standard M42 lenses. They still often sell on Ebay for less than $20. Although since people have discovered the usability of old lenses with the new digital cameras many of these lenses are seeing a rise in price.