Explains the purpose of stacking teleconverters and how to calculating focal length, aperture, and aperture diameter.
Jan 11, 1999 · Notice! Sigma Apo Tele-Converter EX 1.4X / 2X are dedicated Tele Converter lenses, which should be used only with lenses listed in [Table 1]. If ...
The 300D (Digital Rebel or Kiss Digital) doesn't have that switch. It is smart enough to work with both automatic and manual lenses. I suspect that all of the ...