I have not tried a Flattener II. My understanding is that it may correct better, but that it has more vignetting due to the smaller clear field. I also understand that the version III was designed for the 80-110mm scopes, so it may actually perform better at one end of that range. Additionally, the curvature of the ED80 is likely different so I can't say how well it would work with those.
I hope to try the WO Flattener II some time. If I do I'll try to post some comparison shots.
Regards,
Eric
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