I have been using this lens for several years now, but in the near future I will change it to something else. I do not advise using it as a staff member - you are tired of raising the "Leaning Towers of Pisa". They also can’t shoot a portrait, again because of distortions. As a width - nothing, but dark and very chromate, especially at the far end. Pros below: Large FR range, wide angle (can be used as a wide for landscapes and three-dimensional scenes), the presence of a stub. Cons: Small aperture, barrel at the front end, terrible aberrations, very dull grays. Sometimes, when worn around the neck, the trunk comes out. With its angle, a hood is needed, otherwise parasitic light will get in.