Posts belonging to Category 'Binocular Terms'

ED vs HD Binoculars – What’s the Difference?

As I am sure this will be of use to many who are looking at buying binoculars and trying to sift through all the marketing jargon Here is my answer to a question sent in by a long time BBR Patron Supporter Warren: Question: What does HD mean on binoculars & is it different to […]


Exit Pupil – The Complete Guide

Optics & Binoculars 101: Exit Pupil In the world of optics, the exit pupil is a virtual aperture in an optical system. On a pair of binoculars, it can be seen as the bright circle in the center of each eyepiece when you hold them about 30cm away from your eyes and with the objective […]


How to Choose Binoculars

Separating Real Features from Marketing Hype With such a huge amount and variety of brands, sizes, and prices it can get more than a little overwhelming when trying to make a shortlist, nevermind actually choose your binoculars and this is made even the more difficult with all the marketing jargon and the fact that each […]


Apochromatic (APO) Lenses in Binoculars

Recently I have seen as well as reviewed and tested more and more top end binoculars that use Apochromatic lenses (APO) and whilst some manufacturers mention that their products have an APO optical system, very few (if any) go on to explain exactly what it is and what it does. So with this in mind […]


HT Glass from SCHOTT

Carl Zeiss Sport Optics recently introduced their new flagship range of binoculars, the Zeiss Victory HT binoculars, whose main feature and biggest improvement to their already excellent Victory FL range being that they use HT Glass from SCHOTT. I decided to dig a little more deeply to find out just what makes this glass so […]


Interpupillary Distance & Binoculars

The question this week comes from someone who is looking to buy binoculars, but wants to make sure that they fit as they have close set eyes: Question: I have never bought higher end bins so perhaps this is not an issue, but I don’t see any discussion in regard to my particular problem. Which […]


Phase Correction in Binoculars

Phase Correction on Binoculars After the light travels through the objective lenses on a roof prism binocular, it then reflects off the surfaces of the prism. These multiple internal reflections on the prism and because of a phenomenon known as Brewster’s or the polarization angle, cause the light to become partly polarized and the light […]


Anti-Reflection Lens Coatings on Binoculars

In binoculars, anti-reflection coatings are mainly designed to assist with light transmission thus helping to produce a brighter image with better contrast. These days almost all good quality binoculars some sort of these coatings applied to at least some of the air to glass surfaces of their lenses. These anti-reflection coatings are often made up […]


The Basics: Birding with Binoculars – Aiming

Using your Bird Watching Binoculars It was recently pointed out to me by a friend of mine that my main Guide to Birdwatching Binoculars was for her, a little too technical and did not help her enough with the practical aspects of actually using binoculars for birding. As a beginner, she just wanted to know […]


Ruby Coated Binoculars

A common question I get asked is about binoculars with ruby coatings on the lenses and if they are a good or bad thing: The first thing to mention about “ruby” coatings on binoculars is that the coating has nothing to do with the mineral ruby. As far as I know, ruby coated lenses were […]