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Thanks, Fox. Ideally I want a focal length in the 11-13mm range, so the 14mm Pentax and 15mm Panoptic are out. Don't need the 82-degree field of a Nagler.
The Pentax XF 12mm sounds decent, but again has field curvature from 60% from centre. The other option might be a Baader Hyperion 13mm. And William Optics have just introduced their SPL line, which has a 12.5mm with 55-degree app FOV. Price is at the budget end so don't know about quality yet.
Vixen is probably top of the list if I decide to buy something. Until then, I'll keep using my 32mm Meade Plossl with my 2.5x Powermate!
Morton
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