| 摘要 |
An auxiliary shielding and focusing device for a telescope 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.
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