Nikon 35mm and 50mm questsion?

2 in 1 question for you:
Q1. Does the Nikon AF-S 50mm f1.8 G and the Nikon AF-S 35mm f1.8G DX have a built in auto focus motor (i think that's what someone called it)
I have a Nikon D5100, and because the body doesn't have a built in autofocus function, so I need a lens with a built in autofocus motor.

Q2. For travel, would you recommend the 35mm or the 50mm?

They both have autofocus.

For travel, depends what you want to take photos of.

I'd say the 35mm is beter suited for landscapes, cities, well. Wider areas.

50mm would be very nice for portraits, people, specific subjects in front of you, etc.

ALL Nikkor AF-S lenses contain in camera auto focus schemes

For travel, I would avoid both lenses.

I recommend the AF-S 10-24 mm wide angle zoom for travel.

Sample travel photo taken with such a lens

Neither the 35 mm, nor the 50 mm lens produce a wide angle view, something travel photos is all about.

The 35 mm is a "normal" lens on your camera (NOT a wide angle) and the 50 mm is a medium telephoto, basically a portrait lens

You may find looking at this site will help you decide which lens(es) to buy.

http://imaging.nikon.com/...simulator/

Nikon's AF-S lenses have a focusing motor.

For travel use the 35mm although it really isn't wide enough for most interior photography.

On a 35mm film camera or full-frame DSLR a 50mm lens is considered a "normal" lens since its angle of view approximates that of the human eye. On your D5100, with its 1.5x "crop factor" the 50mm lens has the equivalent angle of view of a 75mm lens on a 35mm film camera or full-frame DSLR. Use the 50mm on your D5100 for portraits.

On a 35mm film camera or full-frame DSLR a 35mm lens is a medium wide-angle lens. On your D5100, with its 1.5x "crop factor" the 35mm lens has the equivalent angle of view of a 52.5mm lens on a 35mm film camera or full-frame DSLR. On your D5100 the 35mm is considered a "normal" lens and should be used when you want to capture a scene close to how you see it with your eyes.

Q2. The choice would depend on your 'style' of photographing. 35mm is nearly a standard lens on that camera, just very slightly on the 'long' side of standard. 50mm is a short tele lens, good for portraits, and for 'cropping in' to areas, but probably too long for use in some cities. If you have the usual kit lens on your D5100 set it to 35mm and to 50mm and see the difference around town and elsewhere. But overall there's not a huge difference between 35mm and 50mm. You might find that at times you need something wider than 35, mm, look at your kit lens view at 18mm or 24mm.

If your travels include wildlife you will need a longer zoom lens, in the region of 70 to 300mm.

Buying either the 35 or the 50 at f1.8 will let you take photos in lower light levels than your kit lens.

A1. Yes. They are AF-S and will autofocus with your D5100.
A2. 35mm because it's closer to the angle of view of your eyes.