I was considering one of these for the objective grating set-up but a little confused...
The Bintel Ad (
https://www.bintel.com.au/product/or...d80-refractor/) says:
Two-element 0.85x Focal Reducer lens assembly features one element made from ED extra-low dispersion optical glass but later in the product description says:
The reducer-flattener features three-element optical assembly and is fully multicoated.
Which is it 2 or 3 element??
If it screws onto the drawtube what about filters/ filter wheel????
I also see there seems to be a version with 48mm front threads????
Added: Has anyone tried the Celestron/ Meade SCT x0.63 reducer on the ED80???
OK, found the answer!
https://www.cloudynights.com/topic/4...-on-refractor/