| 摘要 |
An image-inverting prism device with double use for a telescope includes a prism contained in a housing formed of two semi-housings. The housing has a first end for connecting a lens, the first end being provided with three different diameter threaded stepped surfaces. The housing has a second end provided with a male threaded surface. The prism device further has a small lens tube, a changeover tube, a large lens tube, so when the image-inverting prism device is to be combined with a telescope with a large lens or a small lens, the changeover tube is used for connecting a large cylinder or a small cylinder of a telescope, and a large lens or a small lens respectively engaging with different diameter threaded stepped surfaces so that the image-inverting prism device may be use with both a telescope of a large lens and a small lens.
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