Sigma 2.0x EX DG Tele Converter
- Pentax/ Samsung Fit. The 2x EX DG is placed in the same way & it allows the photographer to use the 70-200mm f/2.8 lens as a 140-400mm f/5.6 telephoto zoom lens, & the 300mm f/2.8 lens as a 600mm f/5.6 ultra telephoto