Originally Posted by
Huntr2
Vortex Viper 4x12x40 vs the Nikon Monarch 3x12x42, does anyone have a comparison. The more I look the more confused I seem to be. Does the argon in the Viper better than the nitrogen in the Monarch? Is the 42 mm noticeable over the 40 mm in the Monarch?. Is the eye relief noticeable-Viper I think 3.7 vs 4.0 in the Monarch. The Viper is about 40.00 cheaper. Any real actual knowledge of comparing both?
Argon vs nitrogen doesn't matter. They both achieve the same goal of purging air and moisture from the body, preventing fogging. The only real difference between those two gases (when used in scopes) is their atomic weight, meaning an argon-purged scope is going to be about .0000000000000000001 oz heavier.
Objective size - I don't think you'll notice any difference in light transmission between those two sizes. Go for the one that will fit lower on your gun without hitting the barrel or any other part of the gun.
Eye relief of .3 inches might be slightly noticeable if you're picky, but it's pretty standard. The longer eye relief of the Monarch gives you a little more room to find a comfortable mounting position.
Whether or not the $40 is worth it is up to you. I'm fairly certain that both Vortex and Nikon at that price range are manufactured in Asia. Vortex is a little more clear on their product warranty, but either one is a fine choice.