Your first step to razor-sharp astrophotos
The Bresser AR90/500 Camera Guiding Kit is made for those who are serious about starting astrophotography. With this set - consisting of a guide telescope, a tracking camera and a sturdy prism clamp - your image will stay razor sharp, even at long exposures. Just plug it in and you're ready to track.

Easy to assemble, immediate use
Attach the prism clamp to the carrying handle of your Bresser Messier or Explore Scientific telescope. Mount the AR90/500 guiding telescope next to it, connect the camera via the ST-4 port and connect to your computer via USB. Within minutes you can start automatic guiding - so your stars no longer slip out of focus.
Compact powerhouse with high light sensitivity
The Sony IMX290 CMOS color sensor captures even the faintest light. As a result, you see more detail in less time - from bright planets to subtle nebulae. The sensor offers high resolution and low noise, so you don't need cooling to get sharp, high-contrast images.

Perfect for planets and guiding
Use it to photograph planets or as an autoguider for your main camera. Thanks to its high sensitivity and fast exposure times, it delivers impressive results in every use. From the rings of Saturn to the craters of the Moon - every detail comes into clear focus.
Smart design, ready for any project
The aluminum prism clamp fits multiple frames and adapter plates. The AR90/500 is light, stable and versatile. You can even use several free guiding programs, such as PHD Guiding or Metaguide. This allows you to adjust your setup just the way you want it.
What to expect:
✓ Tight, accurate tracking at long exposures
✓ Sharp planet photos full of contrast and detail
✓ User-friendly assembly, ready in minutes
✓ High-quality image without complicated settings
Specifications
Optics
| Feature | Description |
|---|---|
| Type | Achromatic refractor |
| Opening | 90 mm |
| Focal length | 500 mm |
Camera
| Feature | Description |
|---|---|
| Sensor type | CMOS (Sony IMX290) |
| Sensor format | 5.6 × 3.1 mm |
| Resolution | 1936 × 1096 |
| Megapixel | 2.12 MP |
| Pixel size | 2.9 µm |
| Bit depth | 12 bit |
| Color camera | Yes |
| Maximum exposure | 16 minutes |
| Minimum exposure | 66 µs |
| Images per second | 15 fps |
| Cooling | No |
Connectivity
| Feature | Description |
|---|---|
| Interface | USB 2.0 |
| Autoguider port | ST-4 compatible |
| Compatible operating system | Windows |
Physical properties
| Feature | Description |
|---|---|
| Length × width × height | 60 × 12 × 15 cm |
| Weight | 2200 g |
| Housing | Aluminum |
Application
| Feature | Description |
|---|---|
| Moon & Planets | Yes |
| Deep-Sky | No |
| AllSky / Meteor | No |
| Autoguider | Yes |










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