miteehigh wrote:
A 85 mm lens is usually the choice of portrait photographers. That focal length draws the face more nicely.
Except that the D5300 is an APS-C camera, so a 50mm lens that "acts like a 75mm" is quite close to an ideal short telephoto for portraits.
Yes, an 85mm lens will work too, "acting like a 125mm". But it will either require more working distance or make for much tighter shots.
On my APS-C cameras I use both 50mm and 85mm as my "short and long" portrait lenses. On full frame I usually use 85mm and 135mm.
This is not to say that other focal lengths can't be used. They can. Personally I've shot portraits with 20mm, 700mm and almost everything in between. You have to be very careful using normal to wide angle lenses, due to the way they can distort and exaggerate. Longer telephotos can even more effectively obliterate backgrounds, but require lots of distance between you and the subject, which isn't always a good thing. Short telephotos for [i]full frame[/1] in the 70mm to 135mm focal lengths are the most ideal... the most flattering to the subjects with the least distortion and exaggeration. For Nikon APS-C cameras, that translates to a range from 45mm to 90mm. (Although Canon APS-C have slightly different "crop factor", it's not enough difference to worry about and prime lenses within the same focal length range applies.)
One of the key things usually wanted in a portrait lens is a large aperture. This is so you can blur down backgrounds and make your subject stand out. That's not always necessary, such as in a studio where you can control the background and it's lighting. But the ability to use a large aperture for shallower depth of field is desirable for candid, location shooting where you don't always have much choice about what's behind the subject and need to make it "go away" with blur effects.
Prime lenses can offer larger apertures than zooms, most of which have f/2.8 or smaller max apertures that limit how much background blur they can induce. Plus, f/2.8 zooms, along with a few zooms with even larger max apertures, are big, heavy and very expensive. Those zooms' size can be intrusive and intimidating to subjects, too. More compact and affordable zooms like 18-55mm kit lenses have a max aperture of f/5.6 at the telephoto end of their zoom range. That's two stops smaller than an f/2.8 zoom and three or more stops smaller than a lot of prime lenses.
So... some more arguments in their favor... relatively large aperture 50mm are compact, commonly available and affordable lenses.
The very good Nikkor AF-S 50mm f/1.8G can be found brand new for under $200.
Yongnuo offers a 50mm f/1.4 lens (2/3 stop larger max aperture) that costs even less, though I know nothing about it's build quality, image quality or AF performance. Read some reviews, if considering it.
imagemeister wrote:
Tamron 60mm f2 MACRO .....used ebay
.
Yes, that's a good lens too. It's compact and capable both as a macro lens and good for portraiture. I've used one on my Canon for 5 or 6 years. I'm generally not a fan of using macro lenses for portraiture (f/2.8 max aperture and actually
too sharp, IMO), but this lens is an exception. It has larger aperture than most, which makes it quite usable. It can be sharp with great detail stopped down, or a little more forgiving wide open. Great color rendition and reasonably compact, too. The only thing, it's not fast focusing. That's typically no problem for macro or for most portraiture... But don't expect to use this lens for any sort of action photography. It doesn't acquire focus quickly or track movement well. I haven't compared them myself, but I'd wager the AF-S Nikkor 50mm lens is significantly faster focusing! I see the Tamron 60mm f/2 for Nikon is selling for around $280-$300 on eBay, B&H and elsewhere. I think it's now discontinued, but recently sold new for around $500.
Note: For a D5300 be sure to get a compatible lens. Earlier "AF" Nikkor don't have a built-in focusing motor. They rely on a motor built into the camera body. But that's only found on the D7000 series and higher Nikon DSLR models. The D5300 doesn't have the in-camera focusing motor. If you shop used and even some new, you'll find various lenses that will fit the D5300, but won't autofocus because they lack the focusing motor. So if you want autofocus you'll need to limit your shopping to AF-S or AF-P Nikkors, or third party lenses with a built-in focusing motor (incl. the 60mm Tamron mentioned above).