Question: I'm going to a boat cruise tonight in London. With the following kit to choose from:

* Nikon D7000
* Nikkor 35mm f/1.8
* Nikkor 16-85mm f/3.5-5.6
* Nikon SB-400
* Yongnuo YN-465

I will definitely have both lenses with me, but I don't really like switching between the two too much. Do you think it'll be more useful to use the 35mm (with or without flash), or use the zoom lens and rely on flash all the time? The fact that the boat is moving all the time also means that, when I see something interesting, I need to be ready to take the shot straight away - the scene will have totally changed by the time I manage to change a lens.

Majority of the photos I will be taking will probably be of people, both indoors and out on the deck against the cityscape. But there will still be plenty of opportunities for pure cityscape photos as well, e.g. the house of parliaments, tower bridge, the few skyscrapers.

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This was originally part of [another question on photo-SE](https://photo.stackexchange.com/questions/15371/advices-for-taking-photos-on-a-boat-cruise-at-night).

Answer: 
For night-time photography, a fast prime is worlds better than a consumer-grade zoom - you can see better through the viewfinder, and the camera has much better chances of achieving focus; and of course you can use shorter shutter time or lower ISO. So I'd pick the 35mm f/1.8. Whenever I go out shooting at night without tripod, I usually only take a 28mm f/1.8 and leave all the zooms at home - it's really not their playground.
Both of the previous photographers are only thinking two dimensional; shutter speed and aperture.
With a D7000, set the aperture for the depth of field required & the shutter speed required to freeze actions or let the VR compensate for motion and the camera will select the appropriate ISO for the availalbe light.
For true night shooting, carry a very small flash light & shoot manual focus. Walking around the docks shooting boats light up for Christmas use F8, with VR turned, Auto ISO on and the camera set for a high ISO noise reduction.