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Vortex Optics Viper HD vs Nikon Monarch HG
The Vortex Optics Viper HD 8x42 is a reasonably good Binoculars for people with about $530 to spend.
The Nikon Monarch HG 10 x 30, by contrast, is quite unremarkable and doesn't manage to stand out in any way when compared to other products at that price point.
In either case, we suggest that you first check out a few other options at the $530 budget - it's likely that you'll find some better alternatives.
However, if you nonetheless want to learn more about the Vortex Optics Viper HD 8x42 and Nikon Monarch HG 10 x 30, here's a summary of what we know:
The Vortex Optics Viper HD 8x42 was loved by reviewers at OutdoorGearLab, a highly trusted source that performs reliable in-depth testing. It did great in its "Best Binoculars" roundup where it was named its "Best Binocular for Most People", which, in itself, makes it a product worth considering.
As for the Nikon Monarch HG 10 x 30 - Digital Camera World, a source that conducts reliable hands-on testing, has featured it in its The best binoculars in 2021: binoculars for wildlife, nature and astronomy roundup. However, it didn't make it to any of the top spots.