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G'day Chris,
Field of View gets down to the Field Stop of the EP. The 1.25" format is limited by barrel size to 27 mm. regardless of focal length. I have a 40 mm TV plossl and can't get all of NGC3532 in the FOV with an 8" LX90.
As Matt notes, a 35 mm Panoptic (38.7 mm field stop) will yield superior views of large nebulae in your long focal length C11. At the most recent price of $389 it's fantastic value!
Mark.
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