ZG47
AH elite
- Joined
- Jan 20, 2015
- Messages
- 1,066
- Reaction score
- 1,383
- Location
- Wellington Region, New Zealand
- Member of
- NZDA - Life Member
- Hunted
- New Zealand
Bo
I discovered, decades ago, that I was being deceived, regarding various aspects of sporting optic performance. I started moving back toward fixed power optics, where practical. Have a good week and say hello to Judy for me.
Bob, that is an example of sophistry which has unfortunately deceived many a gun writer. A larger exit pupil allows a greater eye box. That is important for hunting and especially for snap shots. You also need to bear in mind that a rifle scope with a useable objective diameter of 50mm or more, might use less than 20mm of that diameter when set to the lowest magnification. None of the optics makers/marketers can hide their design decisions or performance data, these days.@ZG47
The maximum the human pupil can expand to gather light is 5.5mm
A 6x42 scope gives an exit pupil of 7mm (42÷6=7). This is more than the human eye so better light transmittance.
This is why a variable scope set on 10 power would need a 56 mm objective to be similar.
The old Kahles 8x56 was the scope favourite for roo shooters and fix hunters in the day
Bob
I discovered, decades ago, that I was being deceived, regarding various aspects of sporting optic performance. I started moving back toward fixed power optics, where practical. Have a good week and say hello to Judy for me.