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Steve we didn't notice any vignetting using the 27mm Pano with the barlow, in fact the barlow improved brightness and sharpness right to the edge of field of the Pano.
We did get a little kidney beaning due to the extra eye relief that the barlow creates when used with the 27mm Pano which has 19mm eye relief already. However it was so slight that it wasn't a concern and easily corrected once eye position was altered.
Thanks for the suggestion of the Panoptic Barlow Interface if we find we use this combination a lot we may consider one.
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