0.5X 2.0X 0.3X 0.7X 1.0X Barlow Auxiliary Glass Lens For 180X 300X C-MOUNT Lens. 0.5X 0.3X 2.0X 0.7X Magnification Power Barlow Lens for Industrial Microscope Camera C-MOUNT Lens. Barlow Auxiliary Objective Glass Lens For 180X 300X C-MOUNT Lens Industry Video Microscope Camera. Features: 1. 0.5X 0.3X 2.0X 0.7X Magnification Power lens for Industrial Microscope Camera C-MOUNT Lens. 2. 1-3/4" (42mm) Mounting Thread 3. Doubling Total Magnification power of your Microscope and reduce the focus length. 4. Objective Magnification Power by 0.7 - 4.5X(about 10 - 180X on the display, using 0.35X 0.5X 2.0X Barlow Lens about 2.45 - 360X on the display). Options: 1 x 0.3X Barlow Lens(Increase working distance). 1 x 0.5X Barlow Lens(Increase working distance). 1 x 0.7X Barlow Lens(Increase working distance). 1 x 2.0X Barlow Lens(Reduced working distance). 1 x 1.0X Barlow Lens(Protection function).