Introducing the OctaSlide Filter Slider
Introducing the Twinstar OctaSlide Filter Slider—the first motorized filter slider designed specifically for RASA telescopes. Engineered for astrophotographers seeking precision and efficiency, the OctaSlide / TetraSlide offers unparalleled functionality in a compact design.
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Motorized Filter Control: Seamlessly switch between filters during imaging sessions without manual intervention.
- MONO and OCS: Enables high-quality mono or OSC imaging with multiple filters, and also allows you to capture calibration frames remotely—all with precision and ease.
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Ultra-Thin and Lightweight: Designed to minimize additional weight and maintain optimal balance on your telescope.
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ASCOM Compatibility: Fully compatible with ASCOM standards, ensuring smooth integration with your existing software.
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Premium Materials and Finish: Crafted from high-quality materials for durability and a professional appearance.
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On-Axis Filter Placement: Ensures optimal light path alignment for superior image quality.
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Eight-Filter Capacity: Holds up to eight filters, providing versatility for various imaging needs.
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Universal Telescope Compatibility: Compatible with all telescope systems – offers broad usability. Requires a suitable adapter for your specific setup.
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USB-C Connectivity: Single cable solution for both power and communication simplifies setup and reduces cable clutter.
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Integrated manual Camera Rotator: Allows precise camera rotation for optimal framing and composition.
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European Manufacturing: 100% made in the EU, ensuring high-quality production standards and support.
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Remote Operation: Enables remote filter changes and calibration image acquisition, enhancing convenience during RASA imaging sessions.
- Various Models & Customization Options: Compatible with all popular filter sizes — available in configurations for 4 to 8 filters, tailored to your setup and imaging needs.
- Corner Tilting: Our own integrated tilt-adjustment solution is coming soon.










OctaSlide / model 8x31mm
| RASA model | RASA 8 |
| Weight | 340 g |
| Payload | 5 kg |
| Central obstruction | by diameter: 58% |
| Central obstruction | by surface area: 32% |
| Filter change speed | 15 seconds per filter / one direction |
| Control system | ASCOM compliant |
| Connectivity | USB-C / power and control |
| Power | 5V |
| Maximum power current | max. 0.5A |
| Rotator range | 360° |
| Threads | M48 (camera side) |
| Diameter | 116mm |
| Backfocus distance | 22.3mm |
| Used material |
Anodized aluminum and PET |