Guiding Three - Way Bayonet All - metal structure, with spiral focusing at the rear end and a 1.25 - inch interface. It can adjust and change the optical path, and can be connected to an eyepiece, a guiding telescope CCD, or a refrigerated CCD. Features: 1.25 - inch guiding CCD: The CCD can achieve synchronous focusing with the guiding illumination eyepiece. That is, after the eyepiece is focused, adjust the reflector, and the CCD can also be adjusted to achieve synchronous focusing. The reflectivity of the visual light - passing port is reduced to about 70%, basically achieving that the stellar magnitude visible visually can also be captured by the CCD, and it is suitable for guiding. It is recommended to use an eyepiece within the PL10 - 25 range. Some special eyepieces may not be able to achieve synchronous focusing of the eyepiece and CCD. Suitable for guiding telescopes with an aperture of more than 60MM (Note: Guiding telescopes with double - spiral focusing are not suitable. (Test method: If the guiding telescope can focus when installed with a 1.25 - inch zenith mirror, this guiding port can be used.) Product Parameters: Three - Way Bayonet - CCD Interface: 1.25 - inch spiral interface - Model: Fine - tuning three - way bayonet - Thread: M42 external thread - Size: 83.5x121.3mm - Main Mirror Interface: 1.25 inches - Weight: Net weight 192g / Gross weight 256g - Eyepiece Interface: 1.25 inches - External Filter Availability: Can be connected to a 1.25 - inch filter (purchased separately) Manual measurement data, subject to actual receipt.