I didn't do precise measurments like EdZ might, but this may help answer your question.
I can see all four stars of the big dippers bowl in the fov. Likewise the four stars of Hercules body. I can just fit Deneb and Cygnus epsilon in the fov.
Does this help?
Peter
Hi Peter,
Thanks for these numbers. I have just tried to do a rough estimate using a ruler and a star chart - the distance between Deneb and epsilon should approximately be 11.5°. This would in fact be quite a bit less than the specified 13.2°. But surely more accurate measurements are required to verify this estimate.