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The William Optics Ultra Flat 91 Focal Reducer (P-FLAT-91) is a high-quality optical accessory designed specifically for the Fluorostar 91 telescope. With a reduction factor of 0.79x, it shortens the telescope's focal length from 540 mm to approximately 427 mm, increasing the aperture ratio to f/4.7. It is ideal for astrophotographers who want a wider field of view and shorter exposure times. The reducer is optimized for full-frame sensors, offering a fully corrected image field of 43.2 mm in diameter. The optical design consists of a single group of four lenses, which provides excellent aberration correction and image sharpness to the edges of the frame. The M83x1 telescopic thread allows for easy and secure connection to a telescope, while the M54x0.75 T-mount thread allows for mounting a wide range of cameras and camcorders. The total length of the reducer is 105.5 mm, and the recommended working distance (backfocus) is 56.18 mm. The weight of the device is 1140 g, which is evidence of its solid construction and the use of high-quality materials. The reducer is compatible with the Fluorostar 91 telescope and has been designed for maximum optical performance in combination with this model. • reduction factor: 0.79x
• optical construction: 1 group, 4 elements
• total length: 105.5 mm
• telescopic thread: M83 x 1 x 6 mm
• T-mount thread: M54 x 0.75 x 4 mm
• compatibility with matrices: full frame (Full Frame)
• Corrected image field diameter: 43.2 mm
• recommended backfocus: 56.18 mm
• weight: 1140 g
• compatibility: William Optics Fluorostar 91
• SKU: P-FLAT-91
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