Designed from our master optician Massimo Riccardi, this 4 lens design extender will bring your powerful RiFAst 300 telescope up to f/5.7, increasing resolution and keeping the same – tiny – star’s shape.
It’s fully corrected for a wide field of 42mm. A KAF 1680X chip can be used anyway, with a small amount of vignetting and quality decrease on the extreme borders. It’s fully diffraction limited from 450nm to 730nm.
|Number of lenses||4|