Ready to use immediately
Simply click the William Optics 50mm UniGuide Ultra onto the special rail of your apochromatic. Everything sits securely and centered. So you start tracking accurately right away with no fuss.

Clear image for stable tracking
The 50 mm lens captures a lot of light. Stars jump out and your guide camera finds a suitable target faster. Thus, your tracking remains constant and your shots stay sharp, even at long exposures.
Smooth focusing
The helical focus lets you focus quickly and precisely. Rotate until the star is perfectly in focus. This keeps your guiding reliable and you don't have to waste time.
Extra long dew cap
The long dew hood prevents the lens from fogging up. You can continue even on humid nights. This keeps your image clear and consistent.
Secure attachment with Rotolock
The Rotolock clamp keeps everything firmly fixed and centered. You can rely on stable images during observation or photography.
Specifications
Capacity
| Feature | Description |
|---|---|
| Ocular connection | 1,25″ |
| Lens diameter (mm) | 50 |
| Focal length (mm) | 200 |
| Aperture ratio (f/) | 4 |
| Backfocus (mm) | 21,6 |
Details
| Feature | Description |
|---|---|
| Ring clamp | Yes |
Equipment
| Feature | Description |
|---|---|
| Dovetail | Yes |
General
| Feature | Description |
|---|---|
| Type | Guiding |
| Design | Guidescope |
| Weight (g) | 515 |
| Length (mm) | 270 |
| Series | UniGuide |
| Color | Black/Red |





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