Sharp stars, easy tracking
The William Optics 61 is a guidescope that offers more than an ordinary viewfinder. The lens with FPL-53 glass provides sharp constellations. This helps you with accurate tracking control of your telescope. Perfect for refractors from 700 to 1200 mm focal length.
Astrophotography with optional flattener
With the Flat61 flattener, you can also use the GS61 for astrophotography. Ideal for small cameras and compact setups. This way you get sharp images without the hassle.
Easy focusing
Helicoidal focusing is through the dew cap. Loosen the ribbed counter ring, slide the hood to focus, and tighten again. The back has a retractable extension for added flexibility. So you'll always find the perfect focus quickly.
Solid and completely built
The tube is made of aluminum, lightweight (1.44 kg) and 340 mm long. The guidescope has a dovetail for easy mounting and comes with a transport bag. Everything is designed to keep your setup stable and mobile.
Specifications
Optics
| Feature | Description |
|---|---|
| Lens diameter (mm) | 61 |
| Focal length (mm) | 360 |
| Aperture ratio (f/) | 5,9 |
| Optics coating | Multiple |
| Resolution | 2,3″ |
| Limit value (mag) | 10,3 |
| Light output | 50 |
| Max. useful magnification | 100× |
| Type | Refractor |
Focuser
| Feature | Description |
|---|---|
| Connection (camera side) | M54 |
| Ocular connection | 2″ |
| Fine control | Yes |
| Ring clamp | Yes |
Mounting & accessories
| Feature | Description |
|---|---|
| Dovetail | Yes |
| Transport bag | Yes |
General
| Feature | Description |
|---|---|
| Type | Guiding |
| Design | Guidescope |
| Exterior material | Aluminum |
| Weight (g) | 1440 |
| Length (mm) | 340 |
| Color | Gold |
| Observation goals | Astrophotography (Guidescope) |
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