The ZWO FF65 APO is a refractive astrograph with a 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 you time, allowing you to pay more attention to the image shooting itself.
The ZWO FF65 APO is also a nice choice for your visual observation. It fits diagonals as well as various eyepieces and can achieve a perfect focus, and can even be used to observe planets with a super-high magnification eyepiece.
The whole design of the telescope is compact and lightweight. The OTA weighs only 2kg, and the full package with tube rings and other accessories weighs 2.8kg. It has an aperture of 65mm. The focal ratio is f/6.4 and the focal length is 416mm. Instead of the quadruplet structure of the other ZWO FF APO Refractors, the FF65 APO is a quintuplet, with two ed Glass elements that offer excellent control of Chromatic and other aberrations.
The ZWO FF65 APO supports the full-frame imaging circle and has a fine spot diagram with tiny distortions of the peripheral stars. The 2.5" rigid focuser comes with a new-type 360°rotator with scales and a finder base. M68, M54, and M48 camera adapters are also attached, and the M48 adapter has a 2” female thread for installing filters.
ZWO FF65 APO Main Features
Quintuplet air-spaced APO design - No need to calculate back focus
Small and round stars - with a central RMS radius of 2.5um
Various adapters - M68/ M54/ M48
Dual speed (1:10) focuser - Support both fine and coarse adjustment
No need for a separate field flattener - Self-flattening design
Supports full-frame cameras - Produces a 44mm image circle
Optional Focal Reducer -
Specifications
| Aperture | 65mm |
| Focal Length | 416mm |
| Focal Ratio | f/6.4 |
| Image Circle | 44mm |
| Net Weight | 2kg |
| Gross Weight | 2.8kg |
| Rear End Thread Type | M68 x 1 -M54 x 0.75, M54 x 0.75 - M54 x 0.75,
M54 x 0.75 - M48 x 0.75 M48 x 0.75 mm Filter Thread Size |
| Total Length | 328mm (including 1.25″ eyepiece holder as dewshield contracted) 360mm. (including the 3-piece adapter as dewshield contracted) 388mm (including 1.25" eyepiece holder as dewshield fully stretched) 420mm (including 3 piece adapter as dewshield fully stretched) |
| Rear End of 3 Piece Photographic Adapters | M48 x 0.75 |
SKU: ZWO-FF65-APO