Effects: compact-with the lens tube, so that the depth of insertion can be easily controlled. This item is a 0.5x C-mount adapter to camera or digital eyepiece to microscope. Lens blue reflective coating, increase-transmittance. This item has two adapters: 23.2 turn to 30mm and 23.2 turn to 30.5mm. It can be used in all eyepiece position with 23.2mm or 30mm or 30.5mm, 0.5x magnification to get a more wide of view.