Thanks Chris. But heck, I was too impatient and before I read your message just got a mint looking 1.8 50 lens from Ebay for what I think was a good price (17.10 euro). Unfortunately, it does not have the "Made in Japan" marking around the front lens. Just "Olympus OM-system F.Zuiko Auto-S". I'm pretty well versed in Canon FD and Leica Ms, but I'm new to the OM system and never realized there were different versions of these lenses. So, was this a bad buy? I'm eager to put a lens on and do some shooting, so the 17 euros isn't a big loss, even when this type is a dog. I would also like a wide angle lens; 35 or 28mm. Any opinions about that?
Forgot to tell you about wide angles.
There were three 35mm OM lenses. The 35/2.8 is the most common and sells for about $50-$75. It is sharp and VERY small. Uses the same lens hood as the 50mm Zuikos and the same 49mm filter size.
The 35mm f2 is bigger, has nicer bokeh, and is expensive. $200-$300 usually.
There is a 35mm f2.8 shift lens too, but it is very expensive used, about $600. I've never used it.
For 28mm I have two of the f2.8 version, which is tiny, very sharp, and uses 49mm filters like the many other Zuikos. There is a 28/2 that is expensive and big like the 35/2. I have not used the f2 version but it is said to be good.
If you like wider, the 24mm f2.8 Zuiko is an incredibly sharp lens that is used by a lot of Canon digital users because it blows away Canon's 24/2.8 lens. I like mine, I think it is sharper by a small amount than my Nikon AF-24/2.8. The 24/2.8 Zuiko is about $175-$200 and also uses 49mm filters. There is a very expensive, big, f2 version too but I haven't used it.
For longer lenses, the 85mm f2 is a good lens but overpriced at $300+. I have one I got on Craigslist for $50 a couple yrs ago. I like the 100mm f2.8 better as a portrait lens or short tele. It is sharper than the 85, smaller, and has slightly smoother bokeh. Both the 85 and the 100 use 49mm filters. There is a 100/2 and a 90/2-macro lens too but both typically sell for $1000 each and are both extremely large.
There is also a 50mm f3,5 macro that is very good and a 50mm f2 Macro that is actually better as a normal 50 than as a macro lens. It is beleived by some to be the sharpest 50mm lens ever made when used at normal distances. I have one and it is incredible! I rarely use it though because it is HUGE and doesn't balance well on the small OM bodies. It is also hard to focus at normal distances.