Originally Posted by cpttango30
light transmission has more to do with coatings than obj size. The better to coatings the better the light transmission.
either well work good for your app. Me I would go with the 2.5-10x40. just for that 40mm obj. These are both good scopes I prefer either brand over many others. I traded a leupold for a nikon not to long ago. 10x will get you out to just about any range you want to hunt deer with and the 2.5x is low enough to offer lots of FOV and plenty of light.
You make a good point about lens coatings. Both Nikon and Bushnell claim about 95% light transmission with the Monarch and the Elite 4200. And, all other factors being equal, a 40mm objective has more light to transmit.
My current deer rifle is a .308 Kimber 84 Montana with a Leupold 1.75-6x32mm VX-III. I like the 1.75x in close quarters, but I realized I want a little more magnification for longer shots.
I ruled out a Leupold for the new rifle because they don't make a 2-8x or a 2.5-10x.
Thanks for your advice.