Sony plans to have launched a total of 13 full-frame, E-mount lenses by next spring and aims to expand the FE line to 20 in 2016.

Speaking at Photokina, Shigeki Ishizuka, president of Sony’s Digital Imaging Business Group, announced four lenses that are under development.

These are the Distagon T* FE 35mm f/1.4 ZA; FE 90mm f/2.8 Macro G OSS; FE 24-240mm f/3.5-6.3 OSS; and FE 28mm f/2.

They are expected to arrive from March 2015, apart from the 24-240mm, which should arrive in February.

Sony, which currently has five FE lenses, announced the launch of two more at this week’s Photokina: a Zeiss Vario Tessar FE T* 16-35mm F/4 ZA OSS; and FE PZ 28-135mm f/4 G OSS.

The 16-35mm is due to be shipped from next month, with the 28-135mm arriving from December.

Prices have yet to be announced.

In an interview with AP at Photokina, Sony outlined plans to shake off what it claims is a general perception that compact system cameras are ‘inferior’ to DSLRs.

The firm has pledged to continue developing new technology and lenses in a bid to tempt photographers away from their established Canon and Nikon systems.