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John, thanks for the update on Pentax. It's just that their website seemed to be worded defensively as if being cautious about making specific claims, whereas everyone else seems to be bragging about how tack sharp and contrasty their eyepieces are. I didn't know that Plossls were originally designed for microscopes. Then again I've seen similar scenarios within the audio industry where a microphone like the AKG D12 was marketed as a "warm" vocal mic, yet because it emphasised frequencies around 80 Hz ended up being the industry standard mic for Bass Guitar and Bass Drum instead.
Mark thanks for your update as it confirms my hunch that there's more to the XF range than meets the eye. I'm not too bothered about the edge, and know that a 60 degree XF will show less edge abberation than a 68 degree Hyperion in a fast scope.
Thanks
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