Askar 0.7x Full Frame Reducer for Askar FRA400C 72mm Astrograph
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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 f/3.9 while also providing a flat-field. 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 and star clusters as well as faint and fast-moving celestial objects.
The FRA400C reducer features an M48x0.75 rear-end adapter and has a built-in 2-inch filter thread for convenient filter attachment.
Specifications
- FRA400C focal length with 0.7x reducer: 280mm
- FRA400C focal ratio with 0.7x reducer: f/3.9
- Number of lenses: triplet design
- Back focus: 55mm (from the base of M48 male thread)
- Weight: 0.46kg
- Rear-end thread type: M48 x 0.75 (M48 x 0.75 filter thread inside)
Other Information
- Country of Manufacture: China
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 f/3.9 while also providing a flat-field. 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 and star clusters as well as faint and fast-moving celestial objects.
The FRA400C reducer features an M48x0.75 rear-end adapter and has a built-in 2-inch filter thread for convenient filter attachment.
Specifications
- FRA400C focal length with 0.7x reducer: 280mm
- FRA400C focal ratio with 0.7x reducer: f/3.9
- Number of lenses: triplet design
- Back focus: 55mm (from the base of M48 male thread)
- Weight: 0.46kg
- Rear-end thread type: M48 x 0.75 (M48 x 0.75 filter thread inside)
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 f/3.9 while also providing a flat-field. 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 and star clusters as well as faint and fast-moving celestial objects.
The FRA400C reducer features an M48x0.75 rear-end adapter and has a built-in 2-inch filter thread for convenient filter attachment.
Specifications
- FRA400C focal length with 0.7x reducer: 280mm
- FRA400C focal ratio with 0.7x reducer: f/3.9
- Number of lenses: triplet design
- Back focus: 55mm (from the base of M48 male thread)
- Weight: 0.46kg
- Rear-end thread type: M48 x 0.75 (M48 x 0.75 filter thread inside)
Other Information
- Country of Manufacture: China
Askar 0.7x Full Frame Reducer for Askar FRA400C 72mm Astrograph