The 31mm Nagler will work for glasses as well, making it a logical intermediary between the 42mm and 20mm.
However, it is a bit wider apparent field than the others, so perhaps a 27mm Panooptic, with the same eye relief as the 31 Nagler would be a better choice.
Looking at the field stops might give us a clue:
42mm LVW 46.5mm
27mm Panoptic 30.5mm
20mm XW 24mm
The Panoptic is logically placed by field size.
Does it make sense from the standpoint of magnification on the C11?
42mm--67x
27mm--104x
20mm--140x
Yes, it makes sense there, too.
So the recommendation of the 27mm Panoptic was inspired.
Just one more thing: if you get a 31mm Nagler, the 42mm LVW will get used less and less and less until it just fades away.
I'm just sayin'.............
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