With theBRESSER Barlow lensyou double the magnification ofyour telescopefor lunar, planetary or small clear Deep-Sky object observations. In this way, you can have the advantages oflong focal length eyepiecessuch as long ocular distance or pleasant observation at high magnifications. This BRESSER Barlow lens offers you excellent image quality in the entire field of view thanks to its2-lens design,bringing together the necessary qualities for excellent visual observation and photography. Please note that using the double magnification Barlow lens also doubles the focal length of your telescope, this means double the exposure time and the visual image will be darker.