Features: Require the lens to be a macros lens or telephoto lens, which can achieve autofocus (disadvantage: short focusing distance) Whether full frame imaging is possible during lens imaging is related to the DSLR camera chip and the focals length of objective lens; Ordinary domestic 10times objective lens, M43 system, focals length 100mm, capable of full frame imaging; Ordinary domestic objective lens 4times, M43 system, focals length 70mm, capable of full frame imaging; If the imaging chip is larger, the required focals length will be longer. Specifications: Material:Aluminum Diameter:42mm,49mm,52mm,58mm,62mm,67mm Note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color. Package includes: 1Piece Microscope Objective Lens Adapter