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