Nice eyepiece. Really needs to be used in something like an F10 SCT or refractor. I used to have a 10" F10 SCT and it was very clear and sharp.
I only have F5 dob and F6.3 SCT and its not made for this or I'd keep it for sure.
Would consider trading for similar plossl or other design in the 40mm length (2" format) that works well at slower F stop scopes. Will give priority to cash sale.
Will ship for $5, more if you want it insured or registered.
thanks for looking,