Explains the purpose of stacking teleconverters and how to calculating focal length, aperture, and aperture diameter.
i had just tried this evening using my new 1.4 teleconverter with EOS cameras attached to my scope and couldn't get the camera to work except with the ...
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 ...
In conclusion, the Nikon AF DX Fisheye-NIKKOR 10.5mm f/2.8G ED lens is a well built lens with a great performance for its price range and it's a must have if ...
how to service the Sigma 90mm f/2.8 Macro for Minolta AF. Sigma lens 90/2.8 AF 1:2 macro Minolta. How can I this lens demountable for repair.