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The TeleVue 0.375" spacer ring is one of a number of adapters that are needed to provide the necessary distance between a digital SLR or SBIG STL11000 CCD camera and a TeleVue imaging system refractor.
It is used for prime focus photography with following TeleVue IS (Imaging System) scopes: the TV-102iis, the NP-101is, and the NP-127is. This adapter is recommended for use with digital SLR cameras having an APS size (30.2mm x 16.7mm) imaging chip or smaller.
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