I have a carton 83mm f/15 objective. I bougth this for a project and changed plans. It is in excellent condition. Comes with two plastic spacer rings(not foil spaced). I would like $70 shipped OBO or will trade for a vixen speced 83 x 1000 objective. May also consider other interesting trades such as 2" filters(OIII, UHC, Etc.)If you have anything else to offer lets talk.