What Does The MM Mean On A Lens?

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Wide angle and telephoto lenses

wide angle lens has a smaller focal length, while a telephoto lens has a longer one. Most wide angle lenses are 35mm or smaller. Telephoto lenses start at 70mm and go up from there. Wide angle lenses include more of a scene, while telephoto lenses include only a small part of a scene. You probably refer to this as “zoomed out” and “zoomed in,” respectively.

Different focal length lenses have different purposes. If you’re shooting wildlife, for example, you want a longer focal length lens (100mm is the minimum, but at least 300mm is optimum) so you can get optically closer to your subject without fear of scaring it away. If you’re shooting architecture, on the other hand, you might want a wide angle lens (35mm or smaller), because with a wide angle lens you can include all of your subject in a single shot without having to back up a quarter mile.

A lens with a 75-300mm Focal Length

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