Op­tics

Sky at Night Magazine - - EQUIPMENT • BEST OF 2018 -

The Astro Fi 5 is a Sch­midt- Cassegrain tele­scope com­pris­ing a pri­mary mir­ror and a cor­rec­tor plate with the sec­ondary mir­ror at­tached to the cor­rec­tor. It has a ‘long’ fo­cal length of 1,250mm giv­ing a fo­cal ra­tio of f/10, al­though strictly speak­ing it works out at f/9.8. All op­ti­cal sur­faces are mul­ti­coated.

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