Don care bout which is better 1st, try 35mm and 50mm in your kitlens and walk around...... see whether which focal length u can tahan.... haha, DX users 50mm is really just for portraits IMO!! Can't do much, group portraits oso diff, too tight!

Yes!! U X1.5 ma..... DX cropped 1.5X, but ur 18-55 oso works the same, 18mm X 1.5 - 55mm X 1.5 =27mm - 82.5mm

AF motor = auto focus motor.

Since D3100 lack AF motor on body, lens need to have AF >">
If lens no AF, means you MF lo..

Correct me if I'm wrong tq~

I'm not sure what your friend actually told you but as far as I know, cannot lens cannot work on Nikon body. There are a few reasons :
1) Canon mounting is different from nikon. Canon's mounting size is much bigger than nikon. They are physically and electronically incompatible.
2) Canon lens don't have manual aperture control, you have to shoot wide open.
3) Canon lens flange distance (44mm) is lesser than nikon(46.5mm), you will not be able to focus to infinity.

Nikon mounting are universal, you can mount FX lens on dx, dx lensw on fx. The body will automatically compensate for the smaller image circle. In simple word, yes, FX lens can use on your D3100. Take note that only AFS lenses will AF on D3100, you will loose AF if you use AFD lenses.

On DX non motor body, this is the normal practice for fix lense
shoot normally, get afs 35 1.8
shoot potrait, get afs 50 1.4

ps: The only way I know that can use canon lense on Nikon is by using a macro reversing ring. But your still can't control the aperture unless you have canon body on hand in which it will defeat the purpose for using d3100....

@aldosoesilo

Meter off the bright background, lock in the exposure, and reframe your subject, then take the picture.

D3100 kit comes with USB cable?

And is DIGIeye TR-37 good tripod?

Sigma 30mm f/1.4, Nikkor 35mm f/1.8, Nikkor 50mm f/1.4G
All this can AF with D3100.

Let me remind u that the nikon 35mm is only around RM780, where's the sigma 30 1.4 should be around Rm1600 and 50mm F/1.4 AFS is around RM1800...

Budget not a problem ? Get 35mm f/1.4G. Way better than Sigma
And your mindset is wrong. Be it DX or FF lens, on DX body, you still need to x 1.5

I'd go for AF-S , you can still manual focus it...

I find those who trained up to use manual focus are more pro.

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Added on November 22, 2010, 9:02 pm

Yeah true and agreed. But these days I'm having a fetish for round bokeh.

Wait, what body you're using?

Whats your budget range?

Actually from my perspective , it depends on the user when it's time to change lens...
I usually use the same lens for a while then grow a bit bored of it , and with thousands of pictures taken with it...
When you know those stuff , it actually improves your photography and the picture will come up more details and wonderful

It also depends on your budget~
Some people just buy with the kit lens and its sufficient with it...

Moving from kit lens to 50mm is not an upgrade. Its two different things.

U need to stop worrying and go out take photos. Ia your hobby taking photos or is your hobby collecting camera gear?

U r like just got driving licence, but want fast car with amps n subs and bodykit. Then later go langgar tiang lampu. For crying out loud just learn to drive first??

Lol
You need to bring your fast car first so he can dream and be a good drive someday so that he can drive like a pro with that fast car..
In other words..
Just langgar him! 

Its your skill. Kit lens can take that perfectly well enough if you just try to find out why instead of thinking of expensive lenses.

i think most probably no... bcoz msian power socket are not like that.. indo version yes..