Originally i asked this question on another forum site that I always go to for my photographic related questions, but there was no one that knew anything about this lens and i was directed here. I got a Minolta Rokkor 20-80mm f/2.5 TV zoom lens "for S.V. color". Does anyone know anything about this lens? It is not a C-mount lens , because those are a 25mm screw thread mount. Instead it has a 30mm screw thread mount. I have no idea what the flange back, image register distance it is. I wish i knew the distance because i am wondering if i can get this mount converted. Since the rear element is not in the thread mount like many C-mount lenses i believe the entire metal mount can be removed and replaced with something else. Does anyone know of Lens technicians that change mounts on C-mount lenses to m4/3 or the NX10 or the like? I am thinking this might make a very good lens for an Olympus pen or if the distance from rear lens element to image plane is long enough , it would be ideal to use on the NX10. However i have no idea who would be able to tell me the flange back to image plane distance , or who would be able to figure it out , let alone be able to convert the mount. I have yet to purchase a digital camera, but I have to soon. I have a budget of about 500. Whatever i get i plan to use all the Rokkor and MD mount lenses i have and, I been leaning towards a used NX10 because of its larger sensor and form factor. However I do like the in body IS of the Olympus but not the fact i need to pay extra for an EVF. I thought if this lens could be converted to one of those mounts that would be something to factor in. Any help would be much appreciated.