Lightweight & Compact · Designed for Both Visual Observation and Astrophotography
*Focus can be achieved within a back focus range of 32.5–82.5 mm, measured from the M54–M48 interface shoulder.
Main Features
Flexible Connectivity for Multiple Configurations
Uniqueness
1. Lightweight & Compact
The ZWO FF70 APO features a 70 mm aperture and 490 mm focal length (f/7.0), offering an excellent balance between portability and performance.
The optical tube weighs just 2.5 kg, with a total system weight of 3 kg including mounting rings and dovetail plate.
2. Four-Element Optical Design
The FF70 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.
3. 44 mm Image Circle — Full-Frame Support
With a 44 mm image circle, the FF70 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.
4. Native Flat-Field Design
The FF70 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
5. Coarse & fine focus adjustment
Equipped with a rigid 2.4-inch rack-and-pinion focuser, the FF70 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.
6. Retractable Dew Shield
The FF70 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.
7. Quick-Release Mounting Rings
The mounting rings are detachable, allowing for quick and easy setup or teardown of the telescope.
8. Photography Extension Tube
The FF70 APO includes a photography extension tube with a 2-inch filter thread, along with rear adapters in M48×0.75 and M54×0.75 standards.
This allows for easy integration with a wide range of imaging accessories.
Performance
Optical Layout
Star Field Map
Product Diagram
Specifications
| Product Name | FF70 APO |
| Effective Aperture | 70mm |
| Focal Length | 490mm |
| Focal Ratio | f/7.0 |
| Objective Type | Four-element air-spaced APO (includes 1 ED element) |
| Image Circle | 44mm |
| Maximum Rear Connection Length (Focuser Retracted) | |
| Imaging Mode |
82.5 mm (measured from M48×0.75 male thread) 100.5 mm (measured from M54×0.75 male thread) |
| Observation Mode |
117 mm (measured from 1.25" eyepiece holder) 127 mm (measured from 2" eyepiece holder) |
| Overall Length |
372.5 mm (with 1.25" interface retracted) 415 mm (with photography extension tube retracted) 430.9 mm (with 1.25" interface extended) 473.4 mm (with photography extension tube extended) |
| Telescope Body Weight | 2.5kg |
| Standard Configuration Weight |
3.0 kg (including handle, mounting rings, and dovetail plate) |
| Rear Interfaces |
M64×0.75-M54×0.75 M54×0.75-M54×0.75 M54×0.75-M48×0.75 (built-in M48×0.75 filter thread) |
| Interface of the three-stage imaging adapter | M48×0.75 |
What's in the box?
FF Series Telescope Comparison
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