Ivan, I’ve been experimenting with the APM Riccardi reducer on my Esprit 100 and it seems to work OK. Haven’t quite nailed the spacing required for decent performance on a full frame, but looks good on a smaller chip.
I’d imagine it’d work with Esprit 80...although the Riccardi reducer is quite a chunk of glass and might not fit inside the Esprit 80 focuser tube. The 100 has a 3” focuser tube, fortunately.
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