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*Focus can be achieved within a back focus range of 42-73 mm, measured from the M54-M48 interface shoulder.
Main Features
Flexible Connectivity for Multiple Configurations
Uniqueness
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Four-Element Optical Design
The FF131 APO features a four-element, fully air-spaced apochromatic optical design. All four elements work together to deliver a flat imaging field without the need for an additional field flattener.
One ED (extra-low dispersion) glass element is incorporated to effectively reduce chromatic aberration, resulting in improved color correction and image clarity.
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44 mm Image Circle - Full-Frame Support
With a 44 mm image circle, the FF131 APO fully supports full-frame sensors and a wide range of imaging setups.
It delivers sharp star fields with excellent edge-to-edge performance, ensuring consistent image quality across the entire frame.
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Native Flat-Field Design
The FF131 APO features a native flat-field optical design, eliminating the need for an additional field flattener.
No complex back focus calculations or spacing adjustments are required -- simply attach your imaging setup and start capturing once focus is achieved.
Convenient Design
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Course & Fine Focus Adjustment
Equipped with a rigid 3-inch rack-and-pinion focuser, the FF131 APO offers precise control with a 1:10 course & fine focus adjustment mechanism.
A built-in 360° rotator at the rear allows for smooth and accurate camera angle adjustments.
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Retractable Dew Shield
The FF131 APO features a retractable dew shield, reducing overall length for improved portability.
Precision CNC machining and a high-quality painted finish, combined with an internal anti-reflection coating, help minimize stray light and enhance image contrast. -
Quick-Release Mounting Rings
The mounting rings are detachable, allowing for quick and easy setup or teardown of the telescope.
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Photography Extension Tube
The FF131 APO is designed for seamless integration with modern imaging systems, and includes a standard four-section photographic extension tube with a 2-inch filter thread. Rear adapters in M48x0.75 and M54x0.75 formats are also included, making it easy to connect a wide range of cameras, filters, and astrophotography accessories for a clean, flexible setup right out of the box.
Performance
Optical Layout
Star Field Map
Product Diagram
Specifications
What's in the box?
FF Series Telescope Comparison
