Continuing the series, this time it is Vivitar 90mm f2 series1 MD mount lens with MD/MA with glass adapter.
I bought this old lens few years ago on eBay. Soon after, I saw a post on DPR where one member posted that
he could not make it work with his MD/MA adapter and got rid of it. I think he used a MD/MA no glass adapter.
Since I had both of them, I had a very decent luck with it.