Review on 🔭 High-Powered 16x52 Monocular with Dual Focus Optics for Enhanced Birds Watching, Wildlife Viewing, Hunting, Camping, Hiking, Tourism, Armoring, Living Concerts - 66m/8000m by Alvin Bonifacio

This is not a zoom monocular. And not 16x52. The specifications in the product description say that the lens diameter is 52mm and the magnification is 16. The same description states that the exit pupil is 5.2mm. If the magnification factor were 16, the exit pupil would be 3.25 (the exit pupil is the diameter of the lens divided by the magnification factor). I roughly measured a magnification factor of 10. So I came to the conclusion that the exit pupil is actually 5.2mm. Much bigger and that would be too big to be useful as the human eye can't pick up an exit pupil larger than 7mm and that would be in very low light. This makes this monocular equivalent to half that of an inexpensive 10x50 pair of binoculars. It works adequately for daytime viewing. It was too cloudy since I tested it at night, but I expect it to perform about the same as the inexpensive 10x50 binoculars I've used. In daylight it has a light blue edging and is washed out at the edge of the field. I assume that these aberrations are more noticeable at night. That doesn't mean it's not useful. We just shouldn't expect it to perform like fine tuned optics.