1. Small and portable 2. Make a movie effect 3. Multi-layer optics, coated lenses to ensure good imaging quality 4. Suitable for 17mm screw interface 5. Structure: 2 pieces in 2 groups 6. Distortion: -18 degrees 7. Focusing distance: 70-90mm 8. Weight: 35.5g 9. Dimensions: 2x2.9x3.3 cm