Eyepiece projection recommendations

My old-school telescope is optimized for prime focus, and takes nice, sharp images when used that way. But the focal length is a little short for anything other than wide field stuff, and occasionally I'd like to shoot some simple eyepiece projection images with the T-mount adapter with the barrel extension for said eyepieces.

The trouble is, images captured this way are invariable sharp in the center with rapidly increasing softness the farther away from center you get. I have a set of 1.25" GSO plossls that, while not Naglers, give me pretty good eyeball viewing. Even through the camera eyepiece or using live view, I can focus something simple like the moon to a sharp knife edge, yet the captured image has disturbing halation. Someone suggested the eyepieces could be at fault, that being optimized for visual use makes them less desirable for astrophotography. Since the issue doesn't exist in prime focus, I'm inclined to believe this.

Does anyone with experience have suggestions as to what types of eyepieces are preferable for eyepiece projection astrophotography?

Have you given "afocal projection" a go with those eyepieces?
Not the best picture, but...
http://www.hrastro.com …ods/afocal_proj​ection.php
Am.

Since I have a T-mount with the eyepiece tube, I've never seen much of a reason to. I'm thinking that adding additional glass would complicate matters and degrade the image, even slightly. I have thought of getting one of those external mounts for the digital video cam we have and shooting some video by the afocal method, but I've never quite gotten around to it.

Oh! And that's some mighty fine detail on your afocal lunar composite. Very nice!

If you meant this,
https://photography-on-the.net/forum/showthre​ad.php?t=918049
then taa. I still had some alignment problem.
Am.

No, that's not what I meant. Not afocal. Eyepiece projection doesn't include a separate lens mounted on the camera--the telescope is the prime and the eyepiece is the modifier. Here, like this: http://4.bp.blogspot.c​om …-h/EyepieceProjection.J​PG

I've been playing with microfiche lenses for positive projection. They're designed for high magnification of a flat image on to a flat surface (which is just what we want) and so far, I'm impressed.
The other thing that I've been playing with are old M42 teleconverters. Think of them as well corrected 2x and 3x barlows. I don't think I'll be going back to using eyepieces.

Steve.

I'm also interested in hearing the recommendations, but I'll tell you about my solution for ep projection: I use the Celestron 8-24mm zoom eyepiece.

What I like about it are the t-mount threads on the eyepiece itself. If you already have a t-mount ring for your camera then just screw eyepiece onto the t-ring and it's ready to go.

I find the wide angle part of the ep zoom range does not focus with my focuser, but no problems from 15mm to 8mm. For planetary you generally want the highest magnification anyway.

I can't comment on edge to edge sharpness because I only use ep projection for planetary. No complaints about the middle portion of the frame and that's all you need. I record video with eos_movrec. Also the built-in crop mode video works fine, but eos_movrec helps with centering the planet. FYI, I'm using a 550d/T2i. I convert the video with videodub and process with registax.

One other comment: I get slightly better magnification by inserting a 31mm extention tube between the camera and ep. If you have extension tubes handy then give it a try.

Doug