How to Focus a 25 X 30mm Monocular? – Quick & Easy Guide

People often ask, how to focus a 25 x 30mm monocular.

Let’s find out!

How to Focus a 25 X 30MM Monocular?

To focus a 25 x 30mm Monocular just rotate the knob left or right side. The monocular will focus. 

To get the best results from a 25x30mm binocular, you need to use the right magnification.

It doesn’t really matter which focal length you use, but you must ensure that the resulting photo fits within the dimensions of the actual size of the digital file. If you want to take a 50% crop from your photos, for example, then you need to shoot using a focal length of at least 75 millimeters.

If you don’t already know which focal lengths you should be using, then we recommend using the following equation:

(Sensor width/2) * 1.5 focal lengths in millimeters.

How to Select a Monocular? – Buying Guide

Monoculars are handheld telescopes that allow you to view distant objects using just one eye. You use them for activities such as hiking, camping, and watching sports.

You can also use an optical magnifying glass as a magnifier to help you see things better. You can choose from different sizes and weights depending on your needs.

Also, look around for monoculars, and see if there are any good ones available at a reasonable price.

Magnification Power

A monocular’s magnifying ability affects how far and how detailed we can view things. Monocles with higher magnifications allow us to view objects further away and in greater detail. Most monocles have a magnifying range from 5X to 8X.

Higher Magnifica­tion

Higher magnifica­tion can look good, but it will be hard to use the instrument at high magni­fication levels because small motions make the image move more. If you want an easy-to-handle monocular with decent magnifi­cation, you might choose a 5x, 6×, or 8× one.

Binocular Telescopes

If you want binocular telescopes with higher magnifications, you may choose between a 9x or a 12x telescope. Higher magnifications are available if you’re familiar with using binocular telescopes, spotting scopes, or monocular telescopes.

Remember that as the magnification power increases, so too does the size of the image. You might choose a binocular with lower magnification power to get a wider angle of view.

Lens Size

If you’re considering buying a new camera, you should also think about its maximum focal length (the distance from the front of the camera to the back).

Lenses come in different sizes, ranging from wide-angle lenses (20mm) to telephoto lenses (200mm), which means that you need to choose one depending on whether you want to shoot at a short or long range.

Monoculars usually come with specific magnifications and lenses, such as an 8×25, which has an 8x zoom and a 25mm focal length.

You might want to test out several different binoculars with a range of magnifications and sizes to see which one works best for you.

how to focus a 25 x 30mm monocular

How to Focus a 25 X 30mm Monocular?

Lens Coating

Monocular lenses usually have an anti-glare coating on them. These coatings can affect the clarity of images and may even cause some distortion.

Anti-Glare Protection

There are different levels of anti-glare protection, ranging from just covering the outside lens surfaces to coating every single lens surface. The best (and priciest) option is “fully multicoated,” meaning all sides of all the glasses are covered by multiple coats of anti-reflective material.

Coatings for Sunglasses

There are three types of coatings for sunglasses

  • low-end
  • mid-end
  • high-end.

Low-end glasses are usually just plain plastic; mid-range ones are made from polycarbonate, and high-end ones are made from titanium or another metal.

Eye Relief

When using binoculars, the distance from your eyes to the eyepieces affects how far you can see. If you wear glasses or contacts, you will need an eyepiece’s distance of at least 14 mm. If you don’t wear glasses or contacts, then you might not need a large eyepiece gap.


Monoculars usually consist of two parts: a lens and a prism. A roof prism or Porro Prism is used for low-power magnification.

A Porro lens has a wider field of view than a roof prism. Therefore, if you’re using a Porro lens, you’ll get a wider field of view.

Roof prisms will usually give images more detail and produce a brighter picture than Porro prisms.


Consider your ideal size for the binoculars.

  • Smaller binoculars may be easier to carry around and can be a good travel companion.
  • A larger monocular might be bulkier and harder for you to carry, but it could also provide a sharper, brighter image than a smaller one.
  • A compact monocular is an inexpensive camera that fits into your pocket or purse. It’s small enough to carry everywhere.
  • A bigger monocular that is 9×30 or 10×42 requires a bigger carrying case and is usually set up on a tripod


Consider how often you plan to take the monoculars out and in which situations. If you’re looking for a lighter, easier-to-carry monocular, you might choose one that is smaller.

If you don’t mind having a heavier monocular that needs to be transported in a carrying case, you might want to consider buying a bigger monocular.

Try out several different-sized monocles to see which one feels best in your hand. If you plan to use the monocular frequently, you might not want to go for something that is too heavy or large.


Before buying a monocular, consider your budget. Some may want to buy a cheaper one because they plan to only occasionally need it.

However, you might want to invest a little bit more money into a quality monocle, especially if you intend to use it often.

We hope that this article was helpful. If you have any queries feel free to reach out in the comments section below.


  • John Moses

    John is the Editor in Chief here at The Outdoor Stores. His area of expertise ensures that there is no one better to suggest which rifles are most suitable for your hunting experience. He is also available for you to contact him personally to discuss the types of animals you want to hunt and the terrain you will be hunting on. Feel free to read his posts for expert opinion on Rifles, Scopes, Rangefinders, Bonoculars and Monoculars.

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