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To answer another question regarding the absence of vignetting when using 24 panoptics - I believe it is due to the different OCS system used in the Denk I which uses a 1.25 optic which (via the use of a supplied adapter) mounts the OCS actually inside a 2' diagonal whereas the Denk II uses a 2' OCS which is mounted in front of the diagonal akin to a 2' filter. Hence I believe the different optics and their relative placement in the focal plane accounts for vignetting in the Denk II but not in this Denk I
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