Eyepiece cup for binoculars

An eyepiece cup for binoculars which fits substantially tightly around a user's eye,

• the eyepiece cup (1) being fixed to a clamping ring (4) which is engaged to a catch ring (5) adapted to be fixed to an eyepiece (3);
• wherein a first air admission channel (10) having a longitudinal length substantially perpendicular to an axis of the eyepiece (3) is provided through the clamping ring (4);
• wherein the first air admission channel (10) communicates with a second air admission channel (11) located between the clamping ring (4) and the catch ring (5), the second air admission channel (11) having a longitudinal length which runs in most part parallel to the axis of the eyepiece (3);
• wherein the second air admission channel (11) joins and communicates with a third air admission channel (14) having a longitudinal length extending between the eyepiece cup (1) and the catch ring (5) and the longitudinal length of which is positioned at angle to the longitudinal length of the second air admission channel (11);
• wherein the third air admission channel opens facing towards and opposite a lens of the eyepiece (3);
• wherein the lens is kept fog free by air traveling through the first, second and third air admission channels.