These high-quality, multi-coated, fixed power eyepieces are available separately to expand the capabilities of your Acuter Natureclose spotting scope. All eyepieces are equipped with foldable eyecups so that they can also be used by people who wear glasses. The eyepieces result in different magnifications on the different spotting scopes (65mm / focal length 386mm, 80mm / focal length 480mm, 100mm / focal length 540mm) due to the different focal lengths. To calculate the magnification you just have to divide the focal length of the spotting scope (in mm) by the focal length of the eyepiece (in mm). There are eyepieces with focal lengths from 5mm to 25mm. Scope of delivery: 6mm eyepiece! Power supply and batteries are not included!