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Your spreadsheet looks about right Hamish.
Yes, the Nagler 13mm has a smaller true field than the 25mm Plossl, but don't forget, you've got almost twice the magnification. The Panoptic 24mm is the one you should be comparing with the existing 25mm Plossl, and as I said its advantages are a wider true field at almost the same magnification, the image quality will be significantly better, and the true field will be wider.
Cheers,
Jason.
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