I am looking for more information on one of my lenses, and I cannot find it on the internet through searching. 135mm soligor f2.8. From what I've read soligor was a re-seller, of many different lenses, so I am trying to figure out who made this lens. Its a really sharp lens and really suprised because I got it for $40 bucks on ebay. I just want to know some history behind it, --Markings: Front element SOLIGOR TELE-AUTO 1:2.8 No. 1685647 Markings on the side are the fstops as shown, one in green once in black with 5.6 and 2.8 highlighted. There is a ridge behind the fstop ring near the mount which has two arrows, pointing opposite towards a red "O" and a green "G". There is also "made in japan" on the body. what year is this from and who made this?