Specially designed for the FRA400C, this 0.7x reducer adopts a triplet lens design, it can reduce the overall focal length to 280mm and the focal ratio to F3.9 while providing a flat-field correction. When used with the reducer, the FRA400C supports full-frame imaging and the back focus is a standard 55mm.
The shorter focal ratio enables the telescope to achieve a wider field of view and faster exposure times, making it ideal for capturing large nebulae, star clusters, as well as faint and fast-moving celestial objects.
The FRA400C reducer features an M48×0.75 rear-end adapter and has a built-in 2-inch filter thread for convenient filter attachment.
Specifications
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0.7x Reducer Parameters
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（After attaching）FRA400C Focal length
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280mm
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（After attaching）FRA400C Focal ratio
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f/3.9
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Lens Number
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Triplet design
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Back Focus
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55mm（from the base of M48 male thread）
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Weight
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0.46kg
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Rear-end thread type
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M48×0.75 (M48×0.75 filter thread inside)
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0.7x Reducer Size Diagram
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0.7x Reducer Installation
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Spot Diagram
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