1. Product weight: 38 grams 2. Functions: Manual operation, manual focusing, manual adjustment, manual exposure, priority exposure and focusing with the camera body. 3. High - quality: Precision machined from all - metal. The aluminum alloy ring is paired with a fine copper bayonet (which will not wear the lens), and it is durable. The inner wall is painted to avoid reflection on the CMOS and affect the imaging. 4. Craftsmanship: The craftsmanship is very delicate, and it fits tightly and smoothly with the bayonet. 5. Color: Silver 6. Material: Metal 7. Package contents: - 1 lens adapter ring Only the above package contents are included, and other items are not included. 8. Precautions: Light and different displays may cause the color of the item to vary slightly from the actual product. The allowable measurement error is +/- 1 - 3 cm.