Kase, a Chinese lens manufacturer, presents a 300mm telephoto lens for smartphones. Super Telephoto Lens All sample images were taken with this lens. The fifth photo is an example of use; the smartphone clamp and wood-grain smartphone case are not included. The actual magnification is just over 9x. It doesn't have the power to bring distant scenery incredibly close, so it's suitable for subjects that are a bit further away, or for portrait-style photography that utilizes the narrow depth of field to create bokeh. You can even create circular bokeh if you do it right. With a distortion rate of less than 3%, there's almost no straight-line distortion, which is common with bazooka-style telephoto lenses for smartphones. You can see this by looking at the Honda dealer sign; there's almost no distortion on the four sides. While it's a bit difficult to photograph the moon with a lens of this magnification, I gave it a try. I attached it to the 1x standard lens and used digital zoom in conjunction. When attached to my iPhone XS, I experienced slight vignetting in the corners of the image when shooting at a 3:4 aspect ratio, as indicated by the red arrows in the photo of the red and white iron tower. This vignetting sometimes appeared and sometimes didn't, depending on the position of the focus ring, but even when it did appear, it could be eliminated with a small amount of digital zoom. There is no vignetting when shooting in square format because the 3:4 rectangle is cropped. The body is made of aluminum alloy and has a 17mm screw on the back. The lens has no dust or scratches that would appear in photos. I only occasionally carried the lens itself, and the accessories are unused. I confirmed the operation of the shutter remote control. The battery is new. ------------------------------------------------------------ ・Lens body ・Front and rear lens caps ・Metal clip ・Shutter remote control ・Cloth pouch ・Original box ------------------------------------------------------------ This manufacturer, Kase, produces relatively high-end lenses and also offers lens products for single-lens reflex cameras, not just smartphones. https://en.kasecn.com/