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3rd Party Lenses
Is there any difference between the image quality of an original lens, such as a Nikon Nikkor or a Canon, and the image quality of a 3rd party lens such as one from Tamron, Sigma e.t.c. I have certainly noticed that Sigma lenses are a lot cheaper than original lenses and was wondering if using such a lens would impact my photography, or if using an original lens would be of significant benefit to me.
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