| One of binoculars specifications it is a light shot out from the eyepiece to the width. You can use the diameter (in mm) divided by the magnification to count injection pupil. For example 7x50 type there 50 / 7 (7mm) injection pupil. All 7x50 models are injection pupil 7mm. All 7x42 models are injection pupil 6mm, and so on. You will find many are recommended for astronomy binoculars are shot 7mm pupil, which is very good reason. When your eyes are accustomed to the darkness of night, the pupil will allow more light into the Da. Human pupil at the most can be expanded to 7mm. So long as the light cone 7mm binoculars injection into your eyes, let his eyes light gathering power to achieve maximum effectiveness when you are likely to see the brightest image. All designed to meet the low-luminosity environment of binoculars has 7mm pupil shot. Include: 7x50, 8x56, 9x63, 10x70 and 11x80 and other models. Usually best for astronomical observations. But when you get older, the pupil of your eye not on the sheet so open. Early thirties who's greatest pupil of about 6mm. More than four years old, it fell between about 4.5mm to 5mm. If your pupil size limit only to 5mm or 6mm, 7mm wide use of injection cone binoculars will waste some of the incident light. Part of the light can not enter your eyes, binoculars, light gathering power can not be brought into full play. A little older people, binoculars pupil 5mm or 6mm injection is a better choice. These models include the popular 7x42 and 10x50. |
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