Askar 131F 0.74× Reducer

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