Askar FRA400 Flat-Field Astrograph
The Askar FRA400 is part of the acclaimed Askar FRA (Flat-field Refractive Astrograph) series, designed for high-quality astrophotography and visual observation. With built-in flat-field correction and excellent control of chromatic aberration, the FRA400 delivers sharp, colour-accurate stars from centre to edge — even on full-frame sensors.
Flat-Field Design for Full-Frame Imaging
The FRA400 optical system uses a premium 5-element design with a built-in field flattener. This means no need for additional spacing or back-focus adjustments — simply connect your camera and capture perfectly flat star fields every time.
Fast and Flexible Imaging Performance
At its native focal ratio of f/5.6, the FRA400 is already fast enough for nebulae, galaxies, and wide-field deep-sky imaging. The included focal reducer takes this even further — reducing the system to f/3.9 for dramatically shorter exposure times and an even wider field of view.
Practical Mounting and Rig Setup
The FRA400 includes stylish, patented tube rings featuring multiple accessory mounting points. This makes attaching guide scopes, mini PCs, dew heaters, and focus motors simple and stable — perfect for both field and observatory use.
Key Features
- Flat-field astrograph design for imaging — no additional flattener required
- Includes focal reducer to reach an ultra-fast f/3.9
- Full-frame imaging circle — sharp stars edge to edge
- Excellent chromatic aberration control
- Strong, stylish tube rings with multiple accessory mounting points
- Ideal for deep-sky imaging and visual observation
Why Choose the Askar FRA400?
The Askar FRA400 is engineered to make astrophotography simpler, faster, and more reliable. Whether you're capturing colourful nebulae, galaxy fields, or expansive wide-field shots, the FRA400 delivers stunning results with minimal setup complexity.
Explore the universe with clarity, speed, and precision.
