Aid, Apparent field tester.
Apparent field tester for eyepieces with stops for testing 68deg.AF and 82deg.AF.
We publish the exact specifications for Antares products. Not everyone does. Some vendors are lying about the AFOV and focal length of their eyepieces. Check out your eyepieces with the AFOVC Apparent Field Comparator. Hold the tester to one eye and the eyepiece to the other and find out who. Comes standard with thread-in field stops of 68 and 82 degrees AFOV.