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Possible Duplicate:
Which focal-length lens is usually used for portrait photography, and why?
Should I choose the AF Nikkor 50mm f/1.4D or AF-S DX 35mm f/1.8G for my Nikon D5100?

I have the Nikon D3100. It came with the 18-55mm lens. I shoot mostly portraits. Love doing maternity, children etc. I am buying one new lens soon and am not sure if I should get the 35mm AF-S f/1.8G or the 50mm AF-S f/1.8G.

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marked as duplicate by mattdm, dpollitt, MikeW, John Cavan, ElendilTheTall Jan 29 '13 at 7:48

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Go through your images and pick out your 10 or 20 favorite images (that could benefit from a faster lens). Enter the focal length of each in excel and plot the result. Choose the winner. This can be done programmaticly, but I will not explain here. This is how I bought a 50mm f1.4, my favorite lens. At $500 it has only cost me about 3 cents per exposure to own. :) –  Phil Jan 28 '13 at 19:09
    
If you use Lightroom, then get the excellent Data Plot plugin by Jeffrey Friedl regex.info/blog/lightroom-goodies/data-plot which will plot the frequency of focal lengths in your photos, helping you chose the most common. –  c.cam108 Jan 28 '13 at 19:15
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If you hunt around, a lot of people have asked about 35mm vs 50mm on APS-C sensors, for example photo.stackexchange.com/questions/19705/… and photo.stackexchange.com/questions/19859/… –  MikeW Jan 28 '13 at 19:16
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And photo.stackexchange.com/questions/6166/… –  MikeW Jan 28 '13 at 19:16
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The core question here might just come down to Which focal-length lens is usually used for portrait photography? –  mattdm Jan 28 '13 at 19:17

2 Answers 2

Both of those lenses are excellent choices for your next lens. I don't think you would be unhappy with either one. The definitive answer is something that only you can know though. Luckily you have equipment that allows to you shoot at these focal lengths already, so simply test out the kit lens you have at approx 50mm and approx 35mm and decide what suits your style of photography better. As another user has mentioned, you can also look at your past images and decide based on that as well.

Beyond that, know that virtually all portrait photographers will use both 35mm and 50mm focal lengths, on both APS-C sized(D3100) and full frame sized sensor cameras. As lenses get wider, they do experience added distortion, so that is something to consider. But it isn't practical in most locations to shoot with a 100mm lens to virtually eliminate distortion on an APS-C sensor indoors, so you just have to decide if 35mm or 50mm gives you distortion that you are comfortable with or not.

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And remember that distortion can be corrected in post-processing. –  ElendilTheTall Jan 28 '13 at 19:45
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Well, not of the kind that makes the nose bigger because at 35mm you might be too close to the face. That said, I have the 35mm, shoot portraits - sometimes close to the subject - and find the distortion acceptable, specially on children. –  Marco Mp Jan 28 '13 at 20:19
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+1 - I was going to post the same answer as dpollitt. I agree that only you (user15861) can answer this question and you've got what you need to answer it. –  Omne Jan 28 '13 at 20:33

Personally, I would go with the 50mm or even the 85mm 1.8

The perspective you get from the longer lenses is generally more pleasant for portraits than the wider ones. 85mm is a fantastic focal length for portraits on a DX camera.

Also if you move up to FX those longer lengths are still usable for portraits.

35mm is a very good all around focal length for a DX body, but if you specialize in portraits I think you're better off with the longer focal lengths.

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I would not recommend 85mm on DX for children, they simply move too fast. It also is going to be very difficult if you shoot indoors ever. But yes, 35, 50, 85, 100, 135+... all can be used and are use for portraits. They all have their place. –  dpollitt Jan 28 '13 at 20:32
    
I suppose it depends on the child. I've not had a problem keeping children in the frame with an 85mm, and it also gives you more working room so you're not right up close, so they are more relaxed. Also use the 85mm indoors - certainly not for full body shots, but great for head and shoulders shots. –  MikeW Jan 28 '13 at 20:37

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