I've got the AF70 eyepieces and use them (when not binoviewing) on my slow f/10 CPC1100...
I have the 8, 13, 17, and 22mm from the set, and all are good. The 8mm gets little use due to prevailing seeing conditions, but the 13, 17, and 22 get a lot of use and I've no complaints. For the modest price, they offer great performance.
Astro Tech AF 70 eyepieces?
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