Mini Binoculars: generally include objective lenses not larger than about 25mm in diameter, they are foldable for compactness and ease of transport. Mini binoculars are small, lightweight, and highly versatile in their range of applications: as a moderately-priced gift, for example, it is a rare person who will not enjoy, and find many uses for, a mini binocular, because of their relatively small objective lenses, however, mini binoculars are not intended for high resolution birding or other nature applications. Example: 7 x 16mm
Compact Binoculars: utilise porro prisms or roof prisms to invert the image and usually are styled to form-fit comfortably in the observer's hands; objective lenses are typically 32mm in diameter or less. As their name implies, compact binoculars, whiole larger than mini binoculars, are relatively small and easy to carry for sporting events, as a gift item or as a general-purpose travel binocular, compacts are extremely popular, because, again, for all but the most advanced applications, compacts provide a good trade-off between weight, performance, and cost. Examples: 12 x 32mm or 8-20 x 25 Zoom.
Standard Porro Prism Binoculars: Most binoculars referred to as genera-purpose are standard porro prism models. The typically larger objective lens apertures, 35mm or more, of these modles enable bright, high-contrast images on the entire range of viewing subjects, from sporting events, to long-range animal observation in the wild, to a high-resolution study of bird's feather structure. A moderately-priced, high quality, standard porro prism model is a binocular for almost any observing application. Standard porro prism binoculars are available in a wide range of specifications and price points. Examples: 8 x 40mm, 10 x 50mm, and 20 x 50mm.
Zoom Binoculars: offer the convenience of zooming to higher or lower powers at the touch of a finger. The 10-30 x 50 "Triple Zoom" model allowed powers from 10x wide-field to 30x high-power, and with high-resolution imaging and sharp image focus at all magnifications. Example: 7-15 x 35mm.
Standard Waterproof Roof and Porro Prism Binoculars: Professional-level binocular resolution and performance are generally reserved for standard roof and porro prism models. Designed for advanced applications, such as for serious birders, standard roof prism binoculars are typically of 35mm objective lens aperture or larger; include sleek, straight-line roof prism styling; and incorporate the finest optical glasses, multi-coatings, and multi-element eyepieces. The result is bright, extremely sharp, high resolution images throughout the field of view, and with a level of image fidelity unovtainable in lesser binoculars. Though premium-grade standard roof prism binoculars are not inexpensive, they are usually treasured for a lifetime, Examples: 9 x 32mm or 10 x 42mm.
Larger Aperture Binoculars: There's nothing quite like the view offered by large-objective binoculars. Saxon offer from 60mm-100mm extra large objective lens. The 3D quality of the stereo image can be breath-taking, and just can't be matched by the "flat" view from a single-ocular telescope. Large aperture binoculars offer phenomenal performance for astronomical viewing. They are also a great choice for terrestrial use, especially from long distances.