What Does 30×60 Mean In Binoculars? Buying Guide

If you have been searching binoculars, then you must notice one thing about binoculars. That some of the binoculars are streamlined and some are bulky. The reason behind this difference is the prism type of binoculars. The difference between the shape and size of binoculars are based on the type of prism used in binoculars. Prisms are utilized to address the direction of the view on a level plane and vertically so that the scene is normal.

If there was no prism in binoculars, things would look upside down and tumbled through the binoculars. Generally, prisms are two kinds, porro prism system and roof prism system. Based on lens diameter and magnification, there are various types of binoculars. 30×60 binocular is one of them.

Meaning of 30×60

The number “30” here, means magnification. That means, objects will look 30 times closer in binoculars than naked eye. The number after x, “60”, is the number of lens diameters in mm.  60 mm is marginally bigger than other normal binoculars, which are usually 50mm. But it is smaller than cosmic binoculars(70-80mm) and giant binoculars(100mm). This specific mix of 30×60 seems like a specialty item for devotees, for example cosmologists, and maybe devoted field spectators who hope to set up a fixed stage. If you want to purchase a good binocular for you, you should know the specifications of the binocular very well. Below we have explained some of the functions. 



All binoculars are distinguished by some numbers, for example 30×60. These numbers allude to the magnification and aperture of the binoculars. If the magnification power is 10, then the view through the binocular will be 10 times closer than naked eye. You should choose the magnification power of the binocular according to the purpose of your binocular use

Field of View

field of view

If you use higher amplification, your field of view will be smaller. As the targets will regularly be the biggest part of the optic, it will influence the general size and weight of the binocular. The field of view can be counted either in the quantity of meters or in degrees, e.g. 210m/5.2 degrees. If you want to see wild animals or ocean falcons then we suggest you use a wide field of view so that you can easily spot it. If the field of view is narrow, you have to pan the binoculars more often and you may miss the wild life you are looking for. That’s why, balance between field of view and amplification is important. 


  • Lens Coating

Coating in binoculars is very important. Because coating is the section which makes the difference between cheap and quality binocular. Modern technology is added in this section of binoculars. It is added to improve the quality of your image viewed through the binocular, it also increases the brightness and clarifies the image. Test viewing is essential for this specification. Because if you don’t trial it before you purchase the binocular, you wouldn’t know what progression your eyes can recognize. 

  • Prism Coating 

BAK-4 and BAK-7, these are the two sorts of prisms usually used in binoculars. The quality and price of BAK-4 is higher than BAK-7 prisms. Prism is the component which brings the light to your eyes from the picture. “Porro prism” binoculars highlight wide barrels which aren’t lined up with your eyes. “Roof Prism” is more updated. This prism has eyepieces and target focal point adjusted. Simply You can’t spot the quality difference in binoculars by its outside appearance.  You have to look at the prism quality. Using roof prisms is a good choice. Because it is more light and small than porro prism. 

Eye Relief 

eye relief in binoculars

The space between your eye and an eyepiece in mm is known as eye relief. The field of view must be maximum visible. Eye relief is specially for those who wear spectacles. You can use the 30×60 binocular, while you are wearing glass. There is no elastic defensive layer to ensure your glasses however.

Exit Pupil Size 

exit pupil

Exit pupil size is a significant factor in deciding how well optics perform in low light condition. If you want to count the exit pupil size, you have to divide the diameter by magnification. For example, the exit pupil size of 30×60 binocular is 60/20 = 2mm. The exit pupil size in daylight should be 2-4mm and at night it should be 7mm. The size of the pupil varies with your age.

Usage of 30×60 Binocular

30x60 binocular

30x is unusually high magnification for everyday use, but it is well-known in astronomy (although even there it’s uncommon to actually see a pair in use). Mechanically, it’s simply a standard binocular body with a pair of exceptionally strong eyepieces, e.g. 3mm focal length instead of the usual 10mm. (Corollary: You could soup up any standard 10×50 binocular to 30×50 or more by replacing its eyepieces. Some sellers offer this as a service; of course, it costs about as much as simply buying a brand-new 30×70.)

30x power almost surely means you cannot stabilize these binoculars by hand alone, so it’s meant to be mounted on a tripod (and preferably on a binocular parallelogram mount upon a tripod), not hand-carried. It’s also possible that these are image-stabilized binoculars, which use accelerometers to sense motion and hand jitter, and mechanically deflects a crystal in the light path to counteract most (not all) of that motion. Press that big button on top to turn on the bulky stabilization electronics, and you can hand-hold binoculars in a moving jeep and still read street signs at 10x power, split tight double stars, or track a sparrow chasing a hawk.

Bottom Line 

After reading this article, you might have got a clear idea about binoculars. But before purchasing a binocular you should do some research on your own. There are some facts that vary the price of the binoculars. If you don’t know the specifications, you can’t choose the right binocular for you. Remember your budget and the section you want to use binocular. Give it a trial before buying it. 

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