Bought this lens off eBay. It has a minimum aperture lock, so according to a Wikipedia entry, it should be a post-1981 lens. I’m using it as a manual lens on the Sony Alpha 7 body.
The Alpha 7 has a couple of features which help manual focusing i.e. focus peaking which highlights the in-focus edges in red, yellow or white, and magnification which blows up a small area to fill the whole EVF or rear LCD (I prefer looking through the EVF). Having said this, I had some time struggling to shoot at f/1.7 — nailing the focus probably only 70% of the time during the first weekend. Hopefully my hit rate will improve.
I found it nevertheless fun. 🙂
I’m looking forward to more weekends with this 50mm prime lens. Meanwhile, I have also managed to snatch a 200mm off eBay and now waiting for it to be delivered! 🙂