ZAO I will be hard to fault, same goes for the TMB Supermono. I have both in 16mm, and apart from the noticeably narrower AFOV of the TMB, there is not much between them. I use them in refractors almost exclusively. What's more interesting is the ES68°16 they replaced (well, I couldn't justify keeping all 3). The ES is a cracker, and worth every cent of its moderate price. It's not much bigger than the ZAO, so very compact. The chap who bought it off me says it's now his favourite EP. The caveat is that the ES seems to perform best in newtonians. That said, I'd be surprised if FC was that much of an issue in your relaxed 'fracs, especially when you compare it to the others at the same angles off axis. Can't speak from experience though, as I got it for my dobs, and that's where it was used.
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