Eyepiece choice

[Radec]

Evening all....

I have 15 & 25mm eyepieces for my Nexstar 6 SE and in the bino viewer I love 'em.

Question is, what's the maximum practical focal length to get?

Will 40 give more than 32 bearing in mind the restrictions of the 1.25" diagonal, or will I hit a limit?

I'm not talking expensive eps either as the bino viewer is a revelation - not the most expensive, but with my eyes & skies........

Thanks for any views.

Radec

[rory]

32mm is your limit I think , for 1.25".

[Mark in Macc]

The binoviewers will have internal stops. I don't know about the Revelations, but I suspect they may be around 21mm. This will limit the fov you can achieve without seeing vignetting. 25 mm Plossls (50 deg) should be fine, much more may cause vignetting.

[Radec]

Thanks fellas

Radec