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I'm happy with a 21mm Ethos in my Jaegers 6" f5 achro. The next best choice (especially away from the city) is the 31mm Nagler for the slightly wider field and 6mm exit pupil. Haven't tried a 26mm Nagler but would expect it to be a good compromise.
If I couldn't have those I would look at a 35mm Panoptic or 27mm if viewing mostly from the suburbs.
The f5 ratio is demanding on eyepieces and focusing. When your focal length is 760mm or less then field curvature is hard to avoid for visual.
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