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For an detailed review of binocular selections, read my very lengthy review of the Canon 10x42L. First review. This contains a lot of information about binocular purchase criteria. I will not repeat that information here.
Overall, typical Nikon build quality. For the price, rock solid build. Well designed rear caps, nice strap, comes with tripod mount adapter. The twist eye cups are well designed, they do NOT collapse when pushed against your eye. Diopter adjust is very tight, does not move with rough handling.
The Monarch 5 20x56 are unique binocs. 20x56 is an interesting size binoc. Not a lot of players at 20x56 or 20x60. The reason is, these binocs are really for a niche market. First, 20x is quite extreme, specially for hand holding, so at a bear min. you need a out Overwerks Monopod with action head, a nice match.
What makes this size niche is, the exit pupil diameter of During day use, if u are approx. 50 years of age or older, this exit pupil is a good match for your eye pupil diameter. Perfect set up of the IPD and eye cups are mandatory to allow the exit pupil to coincide with your eye pupil. But with good technique, it works. However, if u do not have steady set up, and are not still, its hard to keep the exit pupil concentric with your eye pupil. This is another benefit of larger objectives, the larger exit pupil allows for leeway for eye placement.
If you are younger, your eye pupil will prob. open much wider during the day, so the image would appear a bit darker to you vs. a larger size binoc. With optics, the total light is always limited by the smallest aperture in the optical chain. Your eye pupil is part of the optical chain. So for day use, with support, need for compact and light weight (for 20x) and u are 50+, these binocs. are a good fit.
If you are younger, of course, you would appreciate larger aperture binocs, such as 20x80mm to benefit with added brightness with a 4mm exit pupil. A noticeably brighter image will be appreciated.
For night time use, well, this is where 20x56 falls short, regardless of your age. Unless you are 70 years of age or older, your night pupil diameter will open significantly wider vs. the exit pupil. See my 10x42L review mentioned above for details on this subject.
So, these binocs are ideally suited for day use and for the older user. Or, if size n weight is a major issue, and you need 20x, well, then age is irrelevant.
While I love the size and build of these binocs, and the optics are well designed and well collimated, the contrast is good for the price, but not excellent. But at this price, I would not expect them to be excellent. Regardless, I was wanted to give these stars, but rounded down, hoping Nikon will upgrade the optics and or coatings, to get a bit more contrast. I think raising the price a bit would be acceptable considering how unique these binocs are.
I considered the Vortex Kaibabs, but went with Nikon for build quality. A few reviewers compared the two, and had different positions. This could be a result of many factors. In general, in twilight or darker, even lower priced binocs with much larger objectives can produce sharper images, as the images will be brighter, and brightness is the foundation of contrast. And its contrast on the retina that we perceive as sharpness.
While they make cheaper 20x binocs, they will not have the build quality and ruggedness of the Nikons. For some, that might be a non issue. Its nice to view many competing pairs side by side, but thats almost impossible with retailers hardly stocking anything.
So as with all things visual optics, one size does not fit all. As our eyes are part of the optical chain. As I wrote in my other how well your vision is, matters also. I am 20/10 in both eyes, which is very rare, so I am some what critical about visual optics. Whereas if I was 20/40, I prob could not really appreciate these differences I mention above. Hence why comparing binocs side by side helps so much, as u are viewing the same subjects in the same light.
These high powered binoculars are great for hunting and any outdoor adventure. I set my Nikon 20x56 on a tri-pod at about 5 AM and glassed an entire ridgeline seeing several elk and white tail at ranges between 800-1900 yards. The low light dispersion is pretty good, although with the 20x optics, the view is slightly darker than the elusive Vortex Kaibab which retail at $1200. For a high end glass, these Nikon's do display a wide range of color and depth at low light conditions. The weight is moderate. Obviously, getting a 20x power optic, these will not be the lightest binocular on the market. The water proofing and outside rubber texture work well in the rain. (Although, it was not a down poor, a consistent annoying rain did not bother these optics at all.) Good sturdy equipment made by NIKON and backed by their 100% Warranty for 25 years. These definitely compete with any binocular at this price range.
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