You thought smartphone manufacturers would stop at three cameras in a device? Think again. Lenovo has been teasing its upcoming Z5 Pro high-end device with a quad-camera and just confirmed that one of the four cameras will have a 2x telephoto lens.

Four sample images from the telephoto module have been posted on the Chinese social media platform Weibo. Image size has been reduced, so it's difficult to judge image detail and noise. That said, the samples look pretty promising in terms of dynamic range and color.

What we don't know at this point is what specification the remaining three cameras will come with. It's fair to assume one of them will be a regular wide angle. The other two could be a super-wide-angle, monochrome camera, a simple depth-sensor for a simulated bokeh effect or even a longer telephoto than 2x.

Looking at the teaser image above the lenses will be arranged in a square with a flash LED at the center. Non-camera specs are firmly located in high-end territory, with a large 6.5-inch QHD+ screen, Qualcomm Snapdragon 845 chipset, 6/8GB of RAM, 64-256GB of internal storage and a 4,000mAh battery.

The Lenovo Z5 Pro launch date is set for October 16, so we should know everything about the new quad-camera around this time next week.