YZ-18839 1.25-Inch Helical Focuser

Make small focus adjustments in a compatible optical setup with a 1.25-inch helical focuser offering 10 mm of travel.

✅ Fine-tune the focus position - A rotating helical mechanism moves the connected optical component along the focus travel.

✅ Keep the adjustment compact - The short-travel accessory adds an adjustment stage within a matching optical arrangement.

✅ Connect the matching threaded component - An M28.5 × 0.6 interface provides the described threaded connection.

Add an adjustment stage to the optical path

Focus depends on the spacing of the components in an optical system. A helical focuser provides a controlled way to vary that spacing when the rest of the assembly has the required interfaces and clearance.

Check the 1.25-inch fit, thread and available back-focus distance before purchase. This is a mechanical focusing accessory; it does not include the camera, lens or telescope needed to form a complete system.

Technical details

• Model: YZ18839
• Format: 1.25 inch
• Travel: 10 mm
• Thread: M28.5 × 0.6
• Construction: aluminium
• Approximate weight: 119 g

Add a compact focusing adjustment to your compatible optical assembly.