The Canon 24mm f/3.5L II TS-E Tilt-Shift lens is a manual focus lens primarily designed with architecture in mind. While it can be used in portraiture and landscape to isolate focus, it’s primary use in architectural photography is to make sure keystoning remains straight throughout the frame. For those who aren’t familiar with the terminology, keystoning refers to keeping vertical lines on buildings and walls perfectly straight from top to bottom. This removes the lens distortion so that images appear as the human eye will see the view if they were standing in that space. I use this lens primarily for exterior elevation shots of homes and multi-story structures. At 24mm it is still considered a wide angle lens but when properly leveled on a quality tripod, this lens produces minimal distortions. The front glass element while rounded can still accept an 82mm threaded circular polarizing filter to help cut glare and produce a deep blue sky if so desired. While the “Tilt” feature is not necessary on most 1-3 story homes, I always utilize the “Shift” function of the lens to make certain that the property is properly framed whether I am 10 feet in the air or 12 inches off the ground. It gives you the perfect composition with little to no cropping of the image in post production. Want more information or have a specific question or comment that I can help you with? Feel free to comment below and I’ll do my best to help you out. Happy Shooting!