Hi,
I got old Oly OM Zuiko Lenses as well, a 70/210mm a 50mm and a 28mm.
I connect them to the ASI120MC with this adapter:
http://www.teleskop-express.de/shop/product_info.php/language/en/info/p4511_TS-CCD-Adapter-for-Canon-EOS-lenses-to-T2--only-14-5mm-length-.html
This is for canon lenses, I add then an e-bay Canon Oly converter
and this is the result:
PB227163.JPG
Clear skyes
Marco