Affordable binoculars with autofocus from Marine Quality 1852 have the ideal ratio between magnification and light incidence.
The binoculars are designed for use on the water and have the following functions: · Auto focus · Magnification/lens 7x50 · BK-7 Prism · Viewing angle: 7.1 (119 m V/1000 m) · Rubber reinforced - provides a good non-slip grip · Foldable eye pieces - great advantage for spectacle wearers · Water repellent · Comes with bag and strap
Auto focus Keeps focus automatically.
Magnification/lens 7x50 The image is 7 times larger than what the naked eye sees. 7x is the recommended magnification in marine binoculars. The second number 50 indicates how large the diameter of the lens is. The higher the number, the better the incidence of light. This is an advantage in low light. For marine use, a 50 mm lens is recommended.
BK-7 Prism Borosilicate prism material of class B. Has a good ability to transport light and image from the objective, through the prisms to the eyepiece and out to the eye.
Viewing angle: 7.1º The viewing angle in degrees indicates the width of the image that can be seen, at a distance of 1000 meters. A viewing angle of 7.1º gives a width of 119 m at a distance of 1000 meters.
