Equipment

Celestron Rowe-Ackermann Schmidt Astrograph

1 June 2016 Ade Ashford

Celestron’s 280mm (11-inch) aperture f/2.2 Rowe-Ackermann Schmidt Astrograph (RASA) is capable of blisteringly fast photographic speeds, capturing images of nebulae and galaxies in seconds. An imaging system optimised for virtually any one-shot colour CCD or DSLR in existence, Ade Ashford appraises this photon-grabbing wonder in the context of evolving optical systems.

Reviews

Mosaic-making: Asimoplan software

23 October 2014 Steve Ringwood

Visual observers now have the benefit of wide-field eyepieces but astro-imagers are somewhat limited to the size of their CCD chip and when it comes to imaging large objects, they must take several images and build a mosaic.