A wide angle lens is a lens where the focal length is significantly shorter than the focal length of a normal lens. This shorter length of lens allows for a wider field of view to capture an entire scene without excluding anything in the background.
Put in simpler terms; it is removing the tunnel vision a regular camera would have an allows you to see the big picture. Great for real estate photography, portraits, and beyond, a wide angle lens can help you achieve the desired results for your photos.
The Canon EF 16-35mm delivers an excellent combination of wide angle and low light performance. This lens features an optical image stabilizer and also offers up to four stops of correction. The Canon EF has three aspheric lens elements and two UD lens elements to reduce aberrations while zooming and has a fluorine coating to help reduce the effects of ghosting. This lens is built to be durable and function in all weather environments and is dust and water resistant to protect you in the harshest conditions.
Sigma has been crafting camera lenses since 1961 and in 2019 is still putting out top of the line camera lenses. The Sigma 24mm is a wide angle lens that is state of the art and designed for full frame cameras, but also works with APS-C sensors too. This lens uses premium FLD and SLD glass elements to reduce aberrations and distortion allowing for the highest quality photos. According to Sigma this lens is ideal for wedding photography, landscape photography, event photography, and low light shoots. This lens has USB dock compatibility that uses a special software that updates the lens firmware and adjust parameters like full time manual focus function.
The Tokina at-X Pro is an award winning lens that is a good all around wide angle lens that is a great budget option. This lens has two super low dispersion glass elements and two aspheric glass that allow you to obtain amazing contrast and sharpness. This is a very compact lens that allows for easy packing when traveling or shooting on the go. The F/2.8 aperture makes it easy to view and auto focus in lower light situations. This lens also comes with a Nikon mount to make it easy to mount to a Nikon if you wish to do so.
The Tamron SP 15-30mm is a full on starter kit that comes with an array of accessories. This starter kit comes with a genuine Tamron front and rear lens cap, a microfiber cloth for cleaning, crevice dust blower, and a lens brush. This lens features vibration compensation imagine stabilization which helps minimize camera shake. This lens is ideal of low light conditions with special glass called XGM and LD to reduce chromatic aberrations and helps ensure clear images. This starter kits comes with everything you need to get started with wide angle photography and to care for and maintain the lens itself.
This 10-20mm lens from Sigma has a fast fixed aperture which makes photographing easier for everyone. The Sigma 10-20mm has a super multi layer coating to reduce flare and ghosting. This lens also features four aspherical lenses to provide correction for distortion. Sigma has implemented complimented an inner focusing system that eliminates front lens rotation. This lens is ideal for landscape, architecture, wedding and photojournalism photography.
Some other great wide angle lenses worth checking out.
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