Askar 0.74x Reducer for 111F
Askar 0.74x Reducer for 111F
The 0.74X reducer brings the Askar 111F's focal ratio down to F5.1, delivering a faster optical system while incorporating built-in field-flattening correction to effectively eliminate field curvature - ensuring sharp and clear stars from the center to the very edges of the frame. The shorter focal ratio provides a wider field of view and shorter exposure times, making it particularly well-suited for capturing expansive nebulae, star clusters, and faint or fast-moving celestial objects. The Askar 111F 0.74× Reducer features a triplet optical design and supports a 44mm full-frame image circle. Its back focus is 55mm (measured from the M48 thread), and both ends feature M68×1 threads for optimal adaptability and stability. The 111F photographic extension tube includes M54×0.75 and M48×0.75 adapters, allowing for direct and convenient connection to the 111F 0.74× reducer. The reducer’s rear adapter ring features a built-in M48×0.75 standard 2-inch filter thread, enabling direct installation of various astronomical filters to accommodate different imaging needs. The entire reducer is precision CNC-machined and comes with front and rear metal threaded caps to protect the optics from dust when not in use.
Specifications
- Reduction Factor: 0.74X
- Askar 111F Flat-Field Refractor Focal Length w/ Reducer: 567mm
- Askar 111F Flat-Field Refractor Focal Ratio w/ Reducer: f/5.1
- Optical Design: Triplet
- Back Focus: 55mm
- Weight: 1.1 lb.
- Connection: M68x1