[mura_gadi (Steve)]

Hello,

I am trying to understand the ray trace from stellafane.org "newt for the web".

What happens when the eyepiece's focal plane is above the field stop of the eyepiece. I am after a F6 and set my max ep at 30mm which has a field stop of 43mm. My 75% band is 44.8mm atm, but if the field stop of the ep is below the focal plane, won't that narrow the band width of the 75% illumination to 43mm Xmm below the focal plane?

Assuming the focal plane of the ep is above the the field stop in the assembly. I am wondering if you actually can run closer to the field stop or even slightly less as the ray trace would be altered by the ep.


Thanks
Steve
Morpheus, ES and Tele vue eps as for general ep design.