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The KOLY BAK-4 Prism 10X25 Monocular Telescope is a compact, lightweight optical device designed for outdoor enthusiasts. Featuring a 10x magnification and a 25mm BAK-4 prism lens, it delivers bright, high-contrast images even in low-light conditions. Its rugged snake skin rubber grip and weather-resistant construction make it ideal for hiking, bird watching, hunting, and more. The package includes essential accessories like a protective case and cleaning cloth, making it a ready-to-go companion for your next expedition.




| ASIN | B09S7Y6ZW1 |
| Best Sellers Rank | #644 in Camera & Photo Products ( See Top 100 in Camera & Photo Products ) #119 in Monoculars |
| Brand | KOLY |
| Coating | Fully Multi-Coated |
| Customer Reviews | 4.0 4.0 out of 5 stars (415) |
| Exit Pupil Diameter | 2.5 Millimeters |
| Eye Piece Lens Description | Konig |
| Field Of View | 331 Feet |
| Finderscope | Reflex |
| Focal Length Description | 25mm |
| Focus Type | Fixed Focus |
| Item Dimensions D x W x H | 4.5"D x 1.5"W x 1.5"H |
| Item Weight | 78 Grams |
| Manufacturer | KOLY |
| Manufacturer Part Number | MS-1025 |
| Model Name | RM |
| Model Number | MS-1025 |
| Mount | Handheld Mount |
| Objective Lens Diameter | 25 Millimeters |
| Optical-Tube Length | 90 Millimeters |
| UPC | 195893179510 |
| Unit Count | 2.0 Count |
| Zoom Ratio | 10 multiplier X |
G**N
Not bad for the money. Would buy again.
You get what you pay for with glass and optics. While this certainly isn’t the best optic in my collection the size makes it very convenient to bring along. I payed around 20 bucks for it and brought it along my backpacking trip through Europe. It took up hardly and space in my bag and provided okay magnification. Quality definitely drops off in low light conditions but it’s still usable. I dropped it a few times and it got rained on a couple of times as well. It still works. 10/10 would buy again to serve the same purpose, a cheap convenient optic that I wouldn’t be heartbroken if it got lost, broken, or stolen.
J**W
Great for cycling.
This fits nicely in the pocket of my cargo shorts for biking. Has clear optics. Other reviewers said that the front lens fell out and mine did, too, right out of the box. I fixed it with a little Gorilla Glue and it's been fine for nearly two years. Easy to focus. Great monoculor for the price.
G**Y
Best unit around in this size range
This is the best monocular in this size range. We'll made, focus is great, and the rubberized outer covering makes this perfect.
S**D
OMG! Don't buy!
This seemed to be what I needed for my get home/bug out bags. It's small and easy to grip and use. However, the field of view at 40 feet was so SMALL that I knew it was a no/go. All I could see was a shake image with a Field of View aprox 4'x4'. In other words, if you were 40 feet from a man standing by a car, you'd get an image of the man from his waist to about two feet above his head. To see the front & back of his car you'd have to scan the car all the while trying hard to keep the stinking thing from moving 12 feet off target just because your fingers twitched a little bit. Wanted to like it but it's junk! Reminded me of something you'd get in a cereal box...yes, I am that old. Going to just use an 8 power scope I use to have on my AR. It's light, only 2 inches longer but has a wide field of view.
D**O
My little Gem
This is the Best monocular I've ever owned. It's the second time that I purchased one it works great for stars and sky objects..Moon and Jupiter looks great for a at the moment. Small little telescope Great product for the price thumbs up
A**R
Ok, but poor build quality, as one lens was detached upon unboxing.
Works almost as described. However, arrived with lens detached, though I could push it back in place, but the weather proofing anti fog properties are compromised. Will return.
D**R
Works well, good value
It works well, is easy to hold and has clear optics. For the price it seems very good value. It's very compact and easy to hold. Nice and solid feeling, I don't feel like I'm going to break it accidentally. The case it comes with is functional but nothing special. No complaints really.
C**E
5 stars for value & customer service
I didn't really have very high expectations given the price. However the build quality felt solid. I did struggle with the eyepiece focusing adjustment to achieve a clear image. However, after working with the vendor, it turns out that the minimum focal range of the unit is 30’. You can’t use it on your patio birdfeeder, but it works great across the yard. You do need to understand the inherent small field of view with ANY monocular that only has a 25mm objective. The only reason that I couldn’t give the unit a perfect 5 is the that the polymer lip around the eyepiece is rather stiff in terms of allowing you to confirm it to your sunglasses. Also, the end caps are essentially useless. They fit so loosely that you’ll lose them almost immediately. I’m going to attempt linking them with an elastic cord that will keep them attached more securely. It’s really a 4.5 star product when you consider the price/value.
F**D
Excelente, e a entrega chegou uma semana antes do prazo.
L**N
The front lens was loose inside the tube when it arrived. I pushed it back into place and it seems OK now.
P**T
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Trustpilot
2 weeks ago
2 months ago