Short Mag
What is an ideal eyepiece for high mag planetary viewing?
I have an ED80 (so called APO) at focal ratio of 7.5. What short focal length EP would you suggest? Target: Saturn and Jupiter. Maximum usable magnification — approximately 160x. EP example 3.5 mm.
Would you prefer an “ortho or ultrascopic” design, or would you consider a wide angle “hand grenade” Nagler or other high quality EP?
As C.A.A. said, the Tele-Vue Radian eyepieces are good choices if you can afford them.
If you are on a budget (like myself), then consider Orthoscopic eyepieces and a quality Barlow lens. Why a Barlow? Because at higher magnifications Orthoscopics (as well as the standard Plossel eyepieces) have small eye lenses and short eye-relief (the distance required for the eye to take in the entire field of view).
I own an ED80 too, so hopefully this will help. I usually use an Antares 3x Barlow lens (similar to Celestron Ultima) with a 12.5mm Orthoscopic for 144x (equivalent to a 4.1mm eyepiece) on nights of so-so seeing.
For nights of good seeing I will use the same barlow lens with a 9mm Orthoscopic eyepiece (equal to a 3mm eyepiece) for a magnification of 200x. Yes, this is somewhat more than the theoretical maximum (normally a no-no), but I have had sharp views of the Moon and planets even at this magnification. Not necessarily any more detail than at the theoretical limit but a more satisfying image scale for me. The ED80 has sharp enough optics (mine does anyway) to do this.
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