I'm wondering what eyepiece to get for wide field viewing. I don't want to spend $500 or so for the big 26mm or 31mm Naglers. But I tried the inexpensive BW Optik 30mm 80 degree widefield, and the aberations were too much for f4.9. So yeah I want it both ways, good views and reasonable price.
I've got a 17mm Nagler Type4 for medium magnification but that only covers a 0.7 deg field. Telescope is 16" f4.9 dob Newt with a 3.1 inch secondary.
I know that an exit pupil greater than 5 to 6 mm will be too big for my 49 year old eyes and some light is lost. Is it OK to go beyond 6 mm exit pupil anyway for the field of view? If so, how far beyond 6mm before the secondary shadow is a problem? What is your recommendation?
Thanks much,
Mike Ratcliff
I've got a 17mm Nagler Type4 for medium magnification but that only covers a 0.7 deg field. Telescope is 16" f4.9 dob Newt with a 3.1 inch secondary.
I know that an exit pupil greater than 5 to 6 mm will be too big for my 49 year old eyes and some light is lost. Is it OK to go beyond 6 mm exit pupil anyway for the field of view? If so, how far beyond 6mm before the secondary shadow is a problem? What is your recommendation?
Thanks much,
Mike Ratcliff