Askar
Askar 131F 0.74× Reducer
Askar 131F 0.74× Reducer
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Product introduction
This 0.74× Reducer is the ideal companion for the Askar 131F telescope, reducing the focal ratio from f/7.5 to f/5.6. This dramatically shortens exposure times, allowing you to effortlessly capture wide-field nebulae,dense star clusters, as well as faint or fast-moving celestial objects.
It also incorporates field-flattening correction capabilities,effectively eliminating field curvature to ensure sharp, clear stars from the center to the edges of the frame.
Featuring a triplet optical lens design, this reducer supports a 44mm full-frame image circle. It has a standard back focus of 55mm (measured from the M48 thread), with M72×1 threads on both ends.The package includes an extension tube and comes with both M54×0.75 and M48×0.75 adapter rings that connect directly to the reducer for easy installation.The rear adapter ring features a built-in M48×0.75 thread, enabling direct attachment of 2-inch filters.
Constructed using CNC machining, the reducer is equipped with metal thread caps on both ends. These caps protect the optics and offer convenient dust-proof storage, reflecting the product's professional quality.
Specifications
| Parameter | |
| （After attaching）131F Focal length | 733.6mm |
| （After attaching）131F Focal ratio | f/5.6 |
| Lens Number | Triplet design |
| Back Focus | 55mm（from the base of M48 male thread） |
| Weight | 0.56kg |
| Rear-end thread type | M72*1 |
| Size Diagram |
| Installation |
| Optical Path Diagram |
| Spot Diagram |
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