Hello everyone, I bought the K&F Concept 14mm some time ago and can basically only report positive things. I don't see the fact that the lens has to be operated manually as a disadvantage, as I mostly take landscape and architectural photos. I always set the focus to near infinity and the aperture between 10 and 16. This always gives me great depth of field. Since I always shoot with automatic shutter, my camera (Canon 6D) sets the exposure time automatically. As I said, for landscape and architectural photography, this lens is very easy to use. If you want to photograph things up close with a low f-number (eg f/4), you will probably have to accept a few test shots before hitting the right focus point. The image quality of the lens is absolutely amazing. I already had various zoom wide-angle lenses from Sigma and Tokina, but their image quality did not even come close to the K&F Concept 14mm fixed focal length. Disadvantage: The lens distorts quite strongly at the edges and must be corrected with suitable programs. Furthermore, I would now like to use ND filters with my lenses and unfortunately cannot mount a Cokin filter holder on the K&F Concept because the lens hood is fixed. I'll have to do some tinkering then. For me, this lens is an absolute purchase recommendation! Top price with an outstanding picture quality!