6 different mounting bases fit for various DSLR camera, such as
"N" mounting base: For Nikon (Full-frame & APS-C) DSLR Camera and etc;
"C-EF" mounting base: For Canon APS-C DSLR Camera and etc; 
"C-1D/5D3/7D" mounting base: For Canon Full-frame DSLR Camera and etc;
"P" mounting base: For Pentax Samsung DSLR Camera and etc;
"F" mounting base: For Fujifilm, Kodak, Sigma, Leika R, Olympus Camera and etc;
"S/K" mounting base: For Sony, Minolta Camera and etc.