Askar 111F 0.74x Reducer

Askar 111F 0.74x Reducer Speed up your deep-sky imaging setup with the Askar 111F 0.74x Reducer, specially optimized for the Askar 111F flat-field refractor. Reduces the Askar 111F focal length to 566mm and changes the focal ratio to a faster f/5.1, helping deliver wider views and shorter exposure times. Perfect for capturing large nebulae, open star clusters, faint deep-sky targets, and fast-moving celestial objects with greater efficiency. Built with integrated field-flattening correction to help reduce field curvature and keep stars sharp and clean from the center of the image to the edges. Supports a 44mm full-frame image circle, making it a strong choice for full-frame astrophotography setups. Features a triplet optical design for reliable correction and high-quality image performance when paired with the Askar 111F. Provides a standard 55mm back focus from the base of the M48 male thread, making camera spacing straightforward for many imaging setups. Both ends feature M68x1 threads, offering a stable and adaptable connection within the optical train. Works conveniently with the Askar 111F photographic extension tube, which includes M54x0.75 and M48x0.75 adapters for direct connection. Rear adapter ring includes a built-in M48x0.75 standard 2-inch filter thread, allowing direct installation of compatible astronomy filters. Precision CNC-machined construction gives the reducer a durable, high-quality feel while maintaining accurate mechanical alignment. Includes front and rear metal threaded caps to help protect the optics from dust when the reducer is not in use. Specifications Product Type: Focal Reducer / Field-Flattening Reducer Brand: Askar Model: 111F 0.74x Reducer Compatibility: Askar 111F Reduction Factor: 0.74x Resulting Focal Length with Askar 111F: 566mm Resulting Focal Ratio with Askar 111F: f/5.1 Optical Design: Triplet design Image Circle: 44mm full-frame image circle Field Correction: Built-in field-flattening correction Back Focus: 55mm from the base of the M48 male thread Rear-End Thread Type: M68x1 Connection Threads: M68x1 on both ends Filter Thread: Built-in M48x0.75 standard 2-inch filter thread Compatible Adapter Support: M54x0.75 and M48x0.75 adapters from the 111F photographic extension tube Weight: 0.5kg Construction: Precision CNC-machined body Recommended Use: Wide-field deep-sky astrophotography, full-frame imaging, nebulae, star clusters, and faint celestial targets What's in the box? Askar 111F 0.74x Reducer Front metal threaded cap Rear metal threaded cap