The reducer decreases the focal length of the telescope, allowing you to take quick photos with shorter exposure times.
Can be used with: ED/SD81S, ED/SD115S, ED/SD103S Application: Reduces the focal length by a factor of 0.67x 625-419 mm (f5.2) for ED/SD81S 795-533 mm (f5.2) for ED/SD103S 890-596 mm (f5.2) for ED/SD115S Prime-focus photography (APS-C)