telecompressor

telecompressor

(tel-ee-kŏm-press -er) (rich-field adapter) A converging achromatic lens inserted inside the focus of a telescope in order to reduce the effective focal length and hence increase the telescope's field of view.
References in periodicals archive ?
The unit incorporates a 0.7x telecompressor lens that focuses light onto a KAI-0340 CCD guide sensor with 7.4-micron pixels in a 640x480 array.
* MEGA REDUCER Astro-Physics announces the Quad Telecompressor Corrector ($1,520) for its 130 StarFire GTX and EDFGT telescopes.
A telecompressor is a handy accessory for the DSI, since it reduces a telescope's focal length (producing a wider field of view) and gives a faster f/ratio.
I tested StellaCam with my 11-inch Celestron fitted with an f/3.3 telecompressor and my 1212-inch Newtonian with the same compressor to yield approximately f/2.3.
Issue #3, also 40 pages, includes a new photographic telecompressor design by Ed Jones.