hi there just got an olympus camera for christmas and would like to know if i have to buy olympus lenses or are there other makes i can use. its an olympus E-420 DSLR
Found this "The Olympus E-420 employs a Four Thirds lens mount and is compatible with the complete range of Four Thirds lenses which includes models from Olympus, Sigma and Panasonic / Leica" here: