The exit pupil diameter is the number attained by dividing the objective lens diameter by the magnification. The exit pupil appears as the bright circular area inside the eyepiece. The larger the exit pupil, the better it is for use in poor light.
The diameter of the light beam leaving any eyepiece and traveling to your own eye's pupil. The exit pupil can be calculate by using ether of the two formulas below: Diameter of the telescope's primary objective divided by the magnification OR Eyepiece focal length divided by the telescope's focal ration (f-number) Example: A telescope has a 203mm (8 inch) primary mirror. Using a magnification 38x, the Exit pupil would be 203mm divided by 38x or 5.3mm.
The diameter of the cone of light exiting the eyepiece. This can be calculated by dividing the diameter of the objective by the magnification used.
The diameter, in millimeters, of the beam of light that leaves the eyepiece is the "exit pupil.” Image brightness directly correlates with the exit pupil; the larger the exit pupil, the brighter an image. Having a large exit pupil is especially advantageous under low light conditions and at night.
(mm) The exit pupil is the diameter of the circle of light visible at the eyepiece of a binocular. A larger exit pupil results in a brighter image, and is related to both the objective lens size and the magnification power (to determine the exit pupil, divide the objective lens diameter by the magnification power).
Measured in mm, this is the diameter of the beam of light leaving the binocular eyepiece, and determines how much light the eyes receive. Larger exit pupils provides brighter images. To calculate Exit Pupil, divide the objective size by the power. For example, the exit pupil of a 7x42 binocular is 42 divided by 7, or 6mm. The square of the Exit Pupil is the geometrical luminosity factor. Since the pupil of the human eye can shrink to a diameter of 2mm to 4mm on a sunny day, this specification is of greater import for low-illumination use.
The size of the column of light that leaves the eyepiece of a scope. The larger the exit pupil, the brighter the image. To determine exit pupil size, divide the objective lens diameter by the power (a 4x40 model has an exit pupil of 10mm).
An indication of the light gathering capability of a lens, such as in a spotting scope or binoculars.
The width of the viewable area seen through in the eyepiece of the scope. If the exit pupil is very small, (less than 4mm) the eye must be held very precisely in line with the scope to see. While the human eye doesn't use more than about 6mm at a time, a larger size aids in maintaining a clear view despite slight movements of gun, head, etc., and greatly speeds target acquisition as well. The Exit Pupil can be found by dividing the objective size in millimeters by the magnification power. Therefore, the pupil shrinks at higher powers. The exit pupil can vary in size over distance, determining the Eye Relief.
The position of the image of the objective lens or primary mirror formed by the eyepiece. It is the smallest disc through which all the collected light passes and is therefore the best position for the eye's pupil.
The size of the image as seen from the binocular's eyepiece. This is the circle of light seen in the eyepiece seen from about 10 inches away. Commonly used as a measurement of how bright the binoculars are. You can figure out the exit pupil diameter by dividing the objective lens diameter by the magnification power. (10x50mm binoculars would have a 5mm exit pupil.) Tips: A binocular works best when the exit pupil diameter matches your eye's pupil diameter. A smaller diameter of around 2-3mmis good for binoculars for bright daytime use. Larger exit pupils of around 7mm are good for low light conditions and star gazing.
The exit pupil refers to the size of the column of light that exits a spotting scope. The larger the exit pupil, the brighter the image. To determine the size, divide the objective lens diameter by the power. Thus, a 15x45 model has an exit pupil, or useable light, of 3mm (45/15 = 3mm).
In one definition, the location and size of the aperture stop image when looking into the rear of the system.
The small circle of light that can be seen behind the eyepiece when an optical instrument is held at arm's length and pointed toward a bright background. It is located at the point where the eye must be placed to see the full field of view (FOV). Exit-pupil diameters are calculated by dividing the objective lens diameter in millimeters by the magnification number. Therefore, a 10x50 binocular has 5mm exit pupils (50 ÷ 10 = 5).
The virtual image of the exit aperture as seen from the image side.
Determines brightness. Calculated by dividing the objective lens diameter (in mm) by the magnification. An exit pupil of at least 6-8mm is recommended for low light use.
The circle of light visible in the eyepiece when the binocular is held a short distance from the viewer. Exit pupil size is determined by dividing the objective lens diameter by the binocular's magnification. A 7x35mm binocular has an exit pupil measuring 5mm in diameter that transmits all the light a normal eye can accommodate under daylight conditions.
Image of the iris diaphragm formed on the back surface of a compound lens by the elements behind the aperture.
In optics, the exit pupil is a virtual aperture in an optical system. Only rays which pass through this virtual aperture can exit the system. The exit pupil is the of the aperture stop in the optics that follow it.