ZWO FF130 APO 130mm f/7.7 Astronomical Telescope, OTA Only

Main Features
• Quadruplet air-spaced APO: No need to calculate back focus
• Small and round stars: With a central RMS radius of 2 microm
• Various adapter: M86/M68/M54/M48
• Dual speed (1:10) focuser: Support both fine and coarse adjustment
• Self-flattening design: No need for a separate field flattener

The ZWO FF130 APO is a refractive astrograph with the powerful flatfield optical design which saves you from the expensive cost of a field flattener. It eliminates the trouble of calculating the back focus distance of the flattener and connecting various accessories to achieve that distance. You can just connect any possible accessories you need. As long as the target is focused, the whole optical system is perfect for imaging. This makes the whole setting up process much more convenient, and saves your time, allowing you to pay more attention to the image shooting itself.

Compared to FF107 APO, FF130 APO has a larger size. The aperture is 23mm larger. The focal length at f/7.7 is also longer, this will yield higher details and slightly higher magnifications but with a field of view suitable for all deep sky objects. The longer focal length will be especially effective on planetary and larger deep sky objects which, when combined with the larger 130mm aperture, will provide stunning detail in a reasonable time.

The quadruplet lens with two ED glasses offers excellent control of chromatic and other aberrations. With its self-flattening design, FF130 APO offers strong advantages in astronomical shooting. It supports a medium frame 60mm image circle, has a fine spot diagram with tiny distortion of the peripheral stars, and its central RMS radius is less than 2 microns.

The OTA weighs 10.5kg, and the full package with tube rings and other accessories weighs 12.5kg. The 3.4" rigid focuser comes with a new-type 360 Degree rotator with scales and a finder base. M86, M68, M54, and M48 camera adapters are also attached, and the M48 adapter has a 2" thread for installing filters. When used with the 3" 0.7 x flat field reducer, the telescope can reach a focal ratio of f/5.4 and a focal length of 700mm, effectively reducing exposure time. The multifunctional handle comes with a central slot for attaching an M6 screw with an M6 screw hole. Standard Losmandy dovetail plate, together with sturdy double tube ring, is perfectly suited for viewing and shooting.

Quadruplet air-spaced APO
FF130 APO is a Quadruplet with two ED glasses which offers excellent control of chromatic and other aberrations

60mm image circle
FF130 APO supports medium-format cameras, such as ASI461, which gives you a larger field of view. The stars are small and round with a central RMS radius of 2 microm.

Self-flattening design
No need for a separate field flattener, FF130 APO eliminates the trouble of calculating the back focus distance of the flattener and connecting various accessories to achieve that distance. You can just connect any possible accessories you need. As long as the target is focused, the whole optical system is perfect for imaging.

Easy-to-use Design

Extension-type hood
ZWO FF130 APO is equipped with a telescopic lens hood, a high-quality CNC machined and painted tube. The lens hood can be fixed with thumb screws to avoiding from sliding.

Detachable tube ring
The telescope' s tube ring can be easily detached and re-installed in seconds.

Various adapters
The FF130 APO also features three different threaded connections for connecting a camera or accessories: M48, M54, and M68 and M86.The M48 adapter features a female thread inside for attaching 2" filters.

Coarse & fine focus adjustment
The ZWO FF130 APO features a large 3.4" rack and pinion focuser that is directly compatible with the ZWO EAF without the need for additional adapters. In front of the focuser is a 360-degree rotator for easily dialing in the framing of your deep sky object or imaging target.