Askar
Askar 0.7x F/3.9 Full-Frame Reducer for FRA400C (FRA400C-07XR)
Askar 0.7x F/3.9 Full-Frame Reducer for FRA400C (FRA400C-07XR)
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Askar 0.7x F/3.9 Full-Frame Reducer for FRA400C
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.
Instructions
Spot Diagram
Technical Specifications
|
（After attaching）FRA400C Focal length |
280mm |
|
|
（After attaching）FRA400C Focal ratio |
f/3.9 |
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|
Lens Number |
Triplet design |
|
|
Back Focus |
55mm（from the base of M48 male thread） |
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|
Weight |
0.46kg |
|
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Rear-end thread type |
M48×0.75 (M48×0.75 filter thread inside) |
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In the Box
- 0.7x F/3.9 Full-Frame Reducer for FRA400C
Warranty & Manuals
Askar Warranty
User's Manual (EN)
