G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 27/10 (2006.01) G02B 27/40 (2006.01) G02B 27/00 (2006.01)
Patent
CA 2050520
ABSTRACT OF THE DISCLOSURE An auxiliary shielding and focusing device for a tele- scope is shown. The device is in the form of a lens cap which can be removably mounted over the light receiving front end of a telescope. The device has a generally flat surface and having two substantially equal size circular openings formed along a diameter therein. These openings are spaced equally from the respective immediately adjacent side along such diameter. The openings prevent the formation of stray light within the telescope and create a parallax effect for the image such that double images are formed when the telescope is out of focus, and the double images will merge into a single sharp image when it is in focus. The openings also inherently serve as a shielding means to reduce the size of the front lens opening of the telescope so as to reduce the brightness of a glaring image of high intensity as well as to increase the resolution of such image.
Smith Paul
Wong David W.
LandOfFree
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