Clear image with deep colors
The William Optics 120/780 instantly gives you a calm, clear and colorfast image. The triplet of FPL-53 and lanthanum glass ensures that stars remain sharp points without color errors. While viewing, you see double stars nicely separated and small details on Jupiter and Saturn are immediately noticeable. Saturn's rings seem almost within reach due to the high contrast and natural color reproduction.

More light, more detail
Thanks to the 120 mm aperture, a lot of light falls in. As a result, you see deep nebulae and star clusters with more structure and softer transitions. Because there is no central obstruction, the image remains even more contrasty. This helps you distinguish both bright planets and deep-sky objects with ease. The image remains stable and calm even at higher magnifications.
Strong in astrophotography
For photography, this telescope is a real powerhouse. Its large image circle makes it suitable for full-frame cameras. When you use the Flat7A flattener you'll be working with a fast f/5.6 ratio, giving ideal conditions for short exposures and sharp corners. The flattener screws securely and precisely onto the focuser, keeping your setup stable and your results more even.

Easy focusing, even on faint stars
The focuser works smoothly and accurately. With the fine 1:10 adjustment, you'll find the sharp point effortlessly, even when using heavy cameras. You can easily rotate the focuser to choose a fine angle of view without detaching the camera. The included Bahtinov mask has a bright pattern, giving even dim stars enough light to focus quickly and precisely.
Cleverly designed and ready to use
The tube feels solid and remains comfortable to use. The integrated handle helps you carry and mount the telescope safely. The carrying bag protects the telescope on the go and keeps everything organized. Thanks to the accessory shoe, you can easily mount a viewfinder or other accessories when you want to expand your setup.
Specifications
Optics
| Feature | Description |
|---|---|
| Type | Refractor |
| Design | Apochromat |
| Aperture (mm) | 120 |
| Focal length (mm) | 780 |
| Focal Ratio (f/) | 6,5 |
| Resolution | 1,15″ |
| Limit value (mag) | 12,3 |
| Light output | 290× to eye |
| Max. useful magnification | 240× |
| Lens Design | Triplet |
| Tube weight (kg) | 7,2 |
| Tube diameter (mm) | 126 |
| Tube length (mm) | 850 |
| Transport length (mm) | 680 |
| Coating | STM |
Focuser
| Feature | Description |
|---|---|
| Design | Rack & pinion |
| Ocular connection | 2″ |
| Camera connection | T2 |
| Free opening (mm) | 83 |
| Reduction | 1:10 |
| Adjustment range (mm) | 95 |
| Rotatable | Yes |
| Telescope side connection | 3,3″ |
Mount
| Feature | Description |
|---|---|
| Design | OTA |
| Type of mount | Without |
Included accessories
| Section | Description |
|---|---|
| Divergent optics | No |
| Dovetail | Losmandy-style |
| Handle | Yes |
| Focusing aid | Bahtinov mask |
| Transport bag | Yes |
| Accessory shoe | Vixen/Skywatcher |
General
| Feature | Description |
|---|---|
| Series | FluoroStar |
| Color | Red |
| Observation goals | Astrophotography, Moon & Planetary, Deep-sky |
| Sun | Only with safe filter |
| Recommended for | Advanced |
| Observatory use | Yes |





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