1、Made of high quality aluminum alloy material, solid, durable, wear resistant, and long life time. 2、The adapter ring allows you reversely attach lens to fit for Pentax PK mount SLR camera body. 3、Let your camera has a macro lens. Great for photographing stereoscopic objects. 4、It further increases the distance between the lens and focus plane. 5、Fine finishing. Install, remove and operate lens smoothly. Description: This lens mount adapter allows lens become a macro lens on micro camera body. Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly with using this adapter. You only can focus manually. Features: 1. Made of high quality aluminum alloy material, solid, durable, wear resistant, and long life time. 2. The adapter ring allows you reversely attach lens to fit for Pentax PK mount SLR camera body. 3. Let your camera has a macro lens. Great for photographing stereoscopic objects. 4. It further increases the distance between the lens and focus plane. 5. Fine finishing. Install, remove and operate lens smoothly. Specifications: Material: Aluminum Alloy Color: Black Conversion Caliber: AF Mount Options: 52mm, 55mm, 58mm Packing List: 1 * Macro Reverse Adapter Ring Note: 1. After connection, auto-focusing is not available, and aperture are all manual (please make sure whether your lens has manual aperture control before purchase). 2. Please remove and replace the adapter ring after turn off the camera. You shall be liable for the consequences caused if violate this operation specification. 3. Due to the large magnification rate and short focusing range of the reverse adapter ring, you need to move back and forth to focus, so it is suitable for patient players only. In addition, it is better to use it together with the macro frame, so as to facilitate focusing.