Third party lenses, ones that aren’t made by the same company that made your camera (which in this case is Nikon), are often less expensive than name-brand lenses so they’re an excellent alternative should you want to save a little bit of cash. You won’t be compromising on image quality, either, as all of the lenses featured in our top list perform incredibly well and you often get more choice in regards to focal lengths with third-party lenses, too. For example, as well as providing popular focal lengths as name-brand lenses do, they also fill gaps in the market so you’re more likely to find a not-so-common focal length in a third-party lens.
When it comes to third-party lens manufacturers, there are several well-known brands, all of which feature on our list, that you can trust and this includes Tamron, Sigma, Tokina, ZEISS, Irix and Samyang.
If you do purchase a third-party lens, make sure it has the specific mount for the camera type you’re using. If you purchase a lens with the wrong lens mount, you won’t be able to use it with your camera.
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https://www.ephotozine.com/article/top-29-best-third-party-nikon-fit-lenses-2018-30990