50mm prime lens is a piece of kit your camera bag shouldn’t be without. Why? Well, we’ll get onto that in more detail shortly but when generally comparing primes with zooms, zoom lenses may be practical, offer multiple focal lengths in one lens and are great for travelling but they don’t tend to be as fast as primes, bokeh isn’t as pleasing and they’re rather bulky.
As for 50mm prime lenses, these offer excellent performance in low light, they’re great for capturing portraits with and offer a view that’s similar to that of the human eye. Also on the ‘plus point’ list is the 50mm’s ability to produce an extremely shallow depth of field which ensures all focus falls on your subject and you can also disguise unflattering backgrounds. Combine these points with the fact that they’re, generally, reasonably priced, and you have a lens you can’t really ignore.
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https://www.ephotozine.com/article/top-38-best-50mm-prime-lenses-2018–30652