Vixen BT80 or BT81

[pluton]

Hello,
I'm looking for information on binocular Vixen Vixen BT80 or BT81 model, I'm not sure, really attracts me you can change the eyepiece and 45 º eyepices.
Has anyone tried it?

regards

Fran

[Peter Drew]

I've used them in the past and also made my own to a similar specification using Vixen 80mm F11 refractors. The BT80's are good optically, the supplied eyepieces are not particularly widefield and maintenance of collimation can be tricky.