Tele Vue 2X BinoVue corrector lens. For use with Bino Viewers. This lens extends the focus and only magnifies 2X. Great for Newtonians, where there is not enough back-focus to use with BinoViewers. Adapters are available to attach this lens to other binoviewers (ie, Baader/Zeiss, Lomo, etc), and of course it fits all TeleVue binoviewers.
New in Box. $130 plus shipping. Purchased for a project that I never completed...