another bino eyepiece question

[doug mc]

Thinking of getting a pair of 25mm plossls for my Andrews bino. Has anyone tried the GSO 20mm superviews or similar 65 degree eyepieces with this unit? The exit openings just before the eyepiece is 20mm, same as William Optic bino. I am concerned about vignetting before the field stops. Thanks.

[dannat (Daniel)]

there will be some vignette -the field stop of the SV's is just under 24mm

[doug mc]

Thanks Daniel. It's looking like a pair of 25mm Vixen plossls. Just bought a pair of 15mm vixens from Myastroshop, sharp field stops in these. My 20mm GSOs are a little bit vague on the edges, could be the limit, but I know some eyepiece brands have less than sharp field stops, GSO unfortunately is one of them in some or their plossls.