If I understand what you're saying correctly Chris, I believe what you are experiencing is eyebox rather than exit pupil. You got it right with the diameter of the objective/magnification = exit pupil, that holds true regardless of the erector, for example, a Schmidt 3-27x56 will have the same exit pupil at 16x as the Hensoldt 4-16x56 even though one is using a 4x erector and the other a 9x. Now, how finicky the eyebox is between a given 4x or 8x scope is another question entirely and that's where ILya could probably explain better than I how that relationship works.@koshkin Whats the science behind erector zoom ratio affecting exit pupil? As a hunter I enjoy having a large exit pupil at minimum magnification as it helps with quick shots when I am walking around still hunting. Repeatable cheek weld isn’t always a thing when you are standing but leaning under a tree limb while leading an animal and trying to avoid objects with the barrel.
The classic calculation that most fud’s take as the gospel is that objective diameter/magnification = exit pupil, but am I wrong in saying that only holds for 3x erector scopes? (And perhaps 4x? My AMG claims 8.3 at 6x which fits the calculation).
I’ve moved some higher zoom ratio scopes down the road because of my perceived trouble “getting behind” them at low power in awkward shooting positions. For instance, a Swarovski Z8i 2.3-18x56 that I had, 56/2.3 = 24.3, but Swarovski states exit pupil at 2.3x is only 8.1mm. Also moved on from a 5-30x50 Zeiss V6, the classic calculation says 10mm but Zeiss states 9.5mm, which is the same for the 3-18x50 Z6, which to me indicates the limitation on exit pupil exists in the erector?