Takahashi FSQ-80FC A Legendary Astrograph — Now in a Portable 80mm The FSQ-80FC brings Takahashi’s legendary FSQ astrograph design into a compact and highly portable 80 mm platform. With a 450 mm focal length and fast f/5.6 optics, it delivers sharp stars and a flat field across modern full-frame sensors while remaining lightweight enough for travel imaging setups. Designed for both astrophotography and premium visual observing, the FSQ-80FC combines Takahashi’s fluorite optics with a new five-element optical system optimized for modern CMOS cameras. Key Features 80 mm fluorite apochromatic astrograph 450 mm focal length (f/5.6) 5-element optical design with two fluorite elements Large 50 mm image circle for full-frame cameras Compact, travel-friendly tube design Precision Takahashi mechanical construction Optimized for Modern Astrophotography The FSQ-80FC is designed with today’s imaging systems in mind. Removing the M48 adapter reveals a standard M48 interface with 55 mm backfocus, allowing many cooled CMOS cameras to attach directly without additional spacers. Optional adapters support larger M54 camera threads and DSLR / mirrorless cameras, making the FSQ-80FC a flexible imaging platform. Optical Design The five-element optical design combines a front fluorite doublet with a rear field-flattening group. The result is exceptional center sharpness and a flat, evenly illuminated field ideal for wide-field astrophotography. Specifications Aperture 80 mm Focal Length 450 mm Focal Ratio f/5.6 Optical Design 5-element / 5-group fluorite apochromat Image Circle 50 mm Tube Diameter 95 mm Length 486 mm (retracted) / 559 mm (extended) Weight Approx. 4.1 kg
