Thread: New binos - 8x42 or 10x42?

Originally Posted by Bol Tackshin

@Tall kiwi - how old are you? Eyes age and the entrance pupil diminishes over time. The exit pupil measurement for the binoculars is 5.25mm for the 8x and 4.2mm for the 10x (Vortex Diamondback HD) which may be more less important to you. Have a look here:
https://www.oreilly.com/library/view...o%20only%205mm.

I'm 26 with 20/20 vision so hopefully have a few more years ahead of me before my sight goes downhill...

well I have 8 power and 10 power the 8 power are in the cubboard almost permanently- only used if I take someone out who does not have binos -the 10 power is really the way to go between the two