HOW TO CHOOSE WHAT DO THOSE NUMBERS MEAN? Binoculars are usually referred to by two numbers, for example 8x40, 12x50. The first of these numbers is the actual magnification of the binoculars: the size to which the subject is enlarged. The second number is the size, in millimetres, of the objective (front) lens. For the same given magnification the bigger the objective lens the brighter the object will appear. Therefore an 8x40 will have the same magnification as an 8x30, but the image will appear brighter. The brightness of binoculars of differing magnifications can be ascertained by dividing the objective lens size by the magnification. This gives us the exit pupil diameter in millimetres. Therefore a 10x50 ( exit pupil 5mm) will have the same brightness as an 8x40 (exit pupil 5mm) and brighter than a 16x50 (exit pupil 3.1mm). This figure should always be kept in mind when purchasing binoculars, especially if they are to be used in poor light or at night. CHOOSING THE RIGHT BINOCULAR FOR YOU Binoculars can be categorised into the traditional size (8x40, 10x50 etc) and the smaller, more lightweight compact binoculars (8x21, 10x25 etc). If brightness of image is of most importance then we would recommend one of the GL3,C3 or M3 range; if a small size and weight is more important then look at the range of Magnaloux compact binoculars. If you are a sport or aviation enthusiast then the Focus Free range are ideal. Magnaloux Optics strongly recommends a magnification of around 8,10 or 12x. Higher magnifications make the subject appear larger but can be difficult to hold steady unless mounted on a tripod. GENERAL USE Any binocular in the magnaloux range with a magnification of 8x or 10x will be a good choice. Points to consider are size/weight against brightness of image. Remember that a compact binocular is likely to be used more frequently than a larger one. BIRD WATCHING The traditional binocular for bird watching has been the 8x40 or a 10x50. These offer the advantages of brightness, a wide angle (especially in the 8x) and a binocular that can held steady. In recent years compact binoculars have become more popular and while they do not offer the brightness in poor light that say an 8x40 will give they are significantly lighter and smaller. If weight is a factor and they are to be used in good light then an 8x21(or 25) or a 10x25 are a great option HIKING, HOLIDAYS & BACKPACKING In these activities size and weight are of maximum importance and we have no hesitation in recommending a 8x21(25) or a 10x25. SAILING Here people have traditionally chosen a 7x50 which offers wonderful low light capabilities together with a manageable magnification on a moving boat. NIGHT SKY When viewing the night sky we want a binocular that gives a reasonable magnification with a large exit pupil diameter. A 7x50 will give a bright image and enable you to see less bright stars than say a 12x50.Magnaloux Optics offer 3 7x50 models (2 in the waterproof range and one focus free) AIR-SHOWS and SPORTING EVENTS Here we have small, fast moving objects a reasonably long distance away. Popular binoculars for these activities are either a 10x or a 12x magnification, whether with a traditional 50mm objective (front) lens or a more compact 25mm . Also worth considering are the range of Magnaloux Focus Free binoculars.