A mock-up of the 300mm lens will go on display at the CP+ show in Japan tomorrow

The announcement comes a week after Olympus pledged to strengthen its lens business and reported a 19% surge in mirrorless camera sales.

The M.Zuiko Digital ED 7-14mm f/2.8 Pro and M.Zuiko Digital ED 300mm f/4 Pro, which are currently under development, are due to be released in 2015.

The ‘dust and splashproof’ lenses will be the ‘final two’ in the M.Zuiko Pro quartet, the firm said in a statement today.

Mock-up versions are due to go on show at the CP+ Camera & Photo Imaging Show which opens in Yokohama, Japan tomorrow.