For Sale Status: Active  Advert Category: Select Category  Advert # 35596 Optec .5 Telescompressor (reducer) T-2" The Optec telecompressor increases the effective speed of the Meade and Celestron Schmidt-Cassegrain telescopes from f/10 to f/5. This 1/2 times reduction in focal length allows for 4 times greater field area and 1/4 reduction in exposure time for extended surface objects such as bright nebulae. The system is optimized specifically for f/10 Schmidt-Cassegrain telescopes to allow for correction of the field curvature and spherical-chromatism that afflicts these types of instruments. At f/5, the maximum corrected field has a diameter of 17.5 mm at the image plane which makes the optic suitable for CCD cameras with imaging chips of the same diagonal dimension or smaller. Click here for more information. Price: £100 Posted on: 2010-07-24 09:19:28 Last Updated on: Because this advert is archived, the contact info has been removed This advert has been viewed 4 times Close this window to go back to the listing

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