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True field is determined by the eyepiece field stop, not it's focal length. The 24mm Panoptic, 32mm Plossl, and 40mm Plossl all have a 27mm field stop; therefore, all will show you the same patch of sky. Assuming for a moment that you have a typical 8" f/6 Newtonian with 1200mm focal length, I would suggest that you consider two of the following three choices:
9mm Nagler (133X)
8mm Radian (150X)
7mm Nagler (171X)
Clear skies,
Bob
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