With the Insta360 X5 costing what it does, taking it out without protection feels like walking a crystal vase down a cobbled street. That is why I picked up the K&F Concept lens guard set. Inside the little orange box you get four toughened glass caps for the two lenses and a pair of curved screen films, each one shaped perfectly for the camera, and they twist on with a reassuring click and stay put.The glass is rated 9H and is supposed to let through 99 per cent of the light. After last Saturday’s walk up Bennachie the photographs back that up, colours and sharpness looked exactly as they should. The coating keeps smears to a minimum too, a quick polish with my sleeve and they are gone. The camera even automatically switches to its guard profile, sparing me a rummage through the menus each time.There are a couple of quirks. Indoors, beneath bright LED strips, a faint line shows up dead centre, just as K&F admit in the leaflet. The first installation also took more force than I was comfortable with, pushing a brand-new camera that hard made me sweat for a second.Even so, at roughly twenty quid it is cheaper than replacing a single scratched fisheye lens. Strong build, clear optics, a small compromise when shooting under artificial light. I will be leaving the guards on.