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ZWO
Lightweight & Compact Flat-Field Apochromatic Refractor ZWO FF131 APO. Designed for Both Visual Observation and Astrophotography.
Available Upon Request
This includes products that we do not keep in stock but are only available upon request or have been announced in advance by the manufacturer. These items are usually shipped within 5-14 days. Once we receive your order, we will notify you by e-mail or telephone of the exact delivery time, as well as the amount of any deposit that will be required.
ZWO FF131 APO
*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
1. 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.
2. 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.
3. 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
4. Coarse & fine focus adjustment
Equipped with a rigid 3-inch rack-and-pinion focuser, the FF131 APO offers precise control with a 1:10 coarse & fine focus adjustment mechanism.
A built-in 360° rotator at the rear allows for smooth and accurate camera angle adjustments.
5. 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.
6. Quick-Release Mounting Rings
The mounting rings are detachable, allowing for quick and easy setup or teardown of the telescope.
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 both 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
All orders we receive until 15:00 concerning products in our warehouse, processed on the same day
Well-trained scientific and technical personnel are available to you at any time, to solve the questions and concerns about your equipment.
If you are not satisfied with the product you received, you can return it within 14 days of receipt.
Experience you can trust. Planetarium of Thessaloniki is the largest supplier of astronomy goods in the Balkans
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