https://www.baader-planetarium.com/en/b ... blue).html
The ERF cell was designed to fit in the end of the dewshield of the ED80 like a push fit bottle stopper, inside diameter approx 111-112mm, outside flange approx 121-122mm, can be easily removed / disassembled if needed. Would work well in the way I used it - makes the ED80 a 60mm f10 scope which is ideal for CaK filters, or, could be mounted internally as a CaK/CaH ERF. Or, you could just use the filter in it's own right... Is in excellent condition.
£150 p&p included within UK, postage at buyers cost outside UK. Payment via paypal 'friends and family' or buyer pays fees.
P1010243 by Mark Townley, on Flickr
P1010244 by Mark Townley, on Flickr
P1010246 by Mark Townley, on Flickr
P1010247 by Mark Townley, on Flickr
