Which of these lenses are better for portrait shooting?
I have a Nikon D3100 and I wanna take nice family portraits. Which of these lenses do you recommend
http://www.bestbuy.ca/...9fd728en02
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Well they're all going to have similar results but ultimately it's going to come down to the details. Which lens is sharpest at the edges, has the least amount of vignetting, is sharpest wide open, has smoothest bokeh and which has the best build quality? Usually the best lens is the most expensive lens.
Umm, I can tell you for sure the second one on your list will not work…
http://www.bestbuy.ca/en-CA/product/canon-ef-50mm-f1-8-ii-lens/10082166.aspx?path=fb83d40a1b501ad64b52eef3c393877den02
The first one will work on your D3100 but won't autofocus (you will need to focus it manually).
The second one is a Canon lens - it won't work on your Nikon - period.
The third one is an AF-S lens & will work AND autofocus on your D3100.
If you absolutely have to have autofocus & can afford it, get the third one. If budget is tight & you don't mind manual focusing (it's not that hard), then get the first one.
The Nikon 50mm f/1.8D "AF" won't work on your crippled camera, the entry level camera from Nikon are built without AF motor in them so you need a lens who come with an automatic AF, like the Nikon 50mm f/1.4G.
The other option would be to get the Nikon 50mm f/1.8G
Do you have the kit lens? 50mm is included in it so you can get portraits, even close-up head shots with it comfortably. Blurring the background, if that is your concern, is just a matter of keeping the background far enough from your subject.