For positive eyepiece projection imaging I've been using a Celestron 15mm Omni eyepiece. While it doesn't show as much chromatic aberration as simply using my Omni barlow, it is still very obvious. Rather than spend a few hundred on a Powermate I'm interested looking at a range of eyepieces that I could use rather than the Celestron I am currently using.
A couple of simple requirements;
1. Must fit inside a variable tele-extender. That means slim design with no bulky waists or chunky rubber sleeves. Celestron silver tops fit in np, Meade 4000 (below 26mm. 26 might fit but it would be a tight fit).
2. Preferably no chromatic aberration, though small amounts can be processed out if there is no other choice.
3. FLs, 10mm, 15mm, 20mm, 32/35mm. The one needed atm is 20 or 15mm. Field of View is not critical for this application, though it would be nice to be able to use it for visual work
4. Sharp!
5. Value for money.
6. I'd like to be able to get the first eyepiece either before the Qld astrofest or while I'm there
I was thinking along the lines of some good Orthoscopics, but I am very open to suggestions.