As probably the only POWERSELLER with 100% positive feedback specialising in Binoculars, it is a privilege to write this brief guide to binoculars and I trust you will find it useful.
What do the numbers mean?
When you look at binoculars you will see numbers like '8x42', '10x50' etc. The '8x' tells you that the magnification is 8 times, making objectives seem eight times nearer to you than they actually are. '42' is the objective lens diameter in millimeter. (The objective lens is the front lens, not the one you look through) Therefore, 10x50 binoculars have 10x magnification and the objective lenses are 50mm in diameter. The wider the objective lens, the more light the binoculars will take in making the image brighter.
When you see 10-50x50, like my Sakura, this means the binoculars are zoom and their magnification varies from 10 to 50 times.
What is Field of View?
The width of the actual panoramic view that you see through the binoculars at a distance of 1000m/1000ft is normally called Field of View. If a wide view is what you want, you will prefer a pair with a bigger Field of View. Remeber though, a higher magnification generally means a smaller Field of View.
What is Depth of Field?
When you focus on one objective through your binoculars, another objective at a distance to it will be in focus at the same time. The distance between the two objectives is called the Depth of Field. Remember again though, higher magnification means smaller Depth of Field.
What Magnification should I choose?
Some people may think that the higher the magnification the better the binoculars but this may not always be the case. You have to remember that the higher the magnification, the smaller the Field of View, the shallower the Depth of Field and the image itself will be more affected by handshake.
From my experience, a magnification of 8x or 10x is good enough for most general purposes.
For higher magnification, a tripod or other support will be needed otherwise the image will be too 'shaky'. This is why I supply a free tripod connector for my compact zoom binoculars.
What is Waterproof?
Waterproof binoculars are sealed and have been purged/filled with nitrogen. No water or moisture will get inside the binoculars and they are essential for watersports and rainy weather.
Do Size and Weight matter when selecting my binoculars?
Yes, size and weight are important but often overlooked by first time buyers. Holding binoculars of about 1kg in your hands for a short time is one thing but holding them for any length time for observation will be very tiring. Occasionally buyers ask me to change a pair they have boughter for a 'smaller' pair because they have found the ones they have bought are just too 'big' for them. Obviously light and small binoculars will be beneficial for travellers.
What is a Poro and Roof Prism?
A prism is a triangle shaped glass inside binoculars that reflect lights. Binoculars with Poro Prism have a tradition shape which is wider at the rear like my Jeff & Jenny 8x42 binoculars shown by the left-hand picture below.
A Roof Prism is a newer design and is more compact. The Jeff & Jenny 8x42/10x42 Waterproof binoculars I sell on eaby (right-hand picture above) have a Roof Prism system. It is easy to see the difference.
While a Poro Prism is normally believed to be good for providing a better 3D image, a Roof Prism is relatively smaller and lighter and, because of this, are prefered by many people.
Can I use binoculars as a spectacle wearer?
Yes, you will have no problem to use most types of binoculars that have adjustable eyecups. All the binoculars I sell have fold-down or twist-up eyecups and are suitable for spectacle wearers.
Most binoculars you are selling are Fully Multi-coasted. What does this mean?
Modern binoculars are coated to reduce light loss or glare. There are several grades of coating: coated, fully coated, multi-coated and fully multi-coated.
Coated means a single layer of coating on at least one lens surface.
Fully coated means single layer coating on at all air-to-glass surfaces.
Multi-coated means multi-layers coating on at least one lens surface.
Fully Multi-coated means all air-to-glass surface has been coated by multi-layers. This gives the best possible image.
What can I do if I have further question?
If you have any further questions, please visit me at
and email me by 'ask the seller a question' and I will try my best to help.
Written by Joy8899