I have some old lenses from the 35MM OM film cameras and recently purchased an adapter that has an auto-focus confirmation chip.  When I tried using these lenses in the past, I really struggled with them because they have to be manually focused and my eyes just aren’t that great.  They’re great lenses and a lot of nice ones can be found for $50-$100 on ebay and in the used department of KEH.com and some of the larger online camera retailers.  I was testing out the adapter with my Zuiko 200 MM f4.0 lens and happened to catch this guy coming in to spread pollen.