This smartphone adapter fits onto any microscope eyepiece with an outer diameter of 26mm and 28mm, but it is not suitable for telescope Easy to use -- no cords or computers needed, take pictures and video directly on your phone Adjusts to hold nearly every smartphone on the market. Blocks out ambient light leaks for beautifully clear photos of specimens. Perfect for at-home hobbyists who wish to share their love of microscopy with family and friends! It can be used with Swift compound microscopes, such as monocluar microscopes SW200DL, SW150, SS110, etc. and aslo match SW350B, SW350T, SW380B, SW380T binocular and trinocular microscopes, thank you.