[. . . ] [. . . ] € ) (infinity)] • Can be used with the optional EC-20 teleconverter in manual focusing (MF) mode. € The optional EX-25 Extension Tube can be used in the following conditions: Focus adjustment MF Working distance 14. ) Filter mount thread diameter : 52 mm • Specifications are subject to change without any notice or obligation on the part of the manufacturer. Precautions: Be Sure to Read the Following Warnings: Safety Precautions • Do not view the sun through the lens. [. . . ] [. . . ]