1. Focus: 0.5X
2 . Lens material: pure optical glass lens
3. Thread interface: M28x0.6 pitch (fine thread)
4. Tube size: 1.25 inch
5. Total article length (including external thread): 14mm
6. Total article length (excluding male thread): 11mm
7. Clear aperture: 22mm
8. Weight: about 12g

Features:
1. Fits standard 1.25 inch eyepieces
2. Shorten the focal length to increase the field of view, usually used for longer focal length telescopes
3. Reduce the focal ratio of the telescope by 0.5x
4. Increases the imaging area
5. Optical lenses help transmit more light
6. Filters can be fitted and screwed onto the eyepiece or camera at the same time
7. Beautifully anodised aluminium housing
8. Not recommended for very fast telescopes or very wide angle eyepieces