Chinese smartphone maker Oppo unveiled its latest model K11 series aimed at photography enthusiasts, in its latest push to expand its presence amid intensified competitions.

The move came as Oppo maintained the top spot in the Chinese smartphone market in terms of shipments in the second quarter of this year, despite the lingering industry-wide decline.

The K11 series are designed to offer competitive middle-range smartphones for consumers, Oppo said, adding that among China's more than 1 billion smartphone users, more than half of them are using middle-range handsets.

But such users demand for high-quality mobile photographing has long been neglected, and the K11 series, equipped with high-end lens', aim to solve such problems, Oppo said.

The market research company International Data Corp said on Thursday that the Chinese smartphone market continued its decline trend from April to June, with shipments recording a year-on-year decrease of 2.1 percent to 65.7 million units.

Oppo maintained the top spot in the domestic mobile phone market with a market share of 17.7 percent, followed by Vivo, Honor, Apple, Xiaomi and Huawei in order, according to IDC.