What should my plan be for photographing in a nightclub setting?

Maybe the most important thing is a flash w/ TTL. ISO depend on the amount of surrounding light: People photos in clubs look best, when there is some background/fill light. So if it's dark, you maybe have to go until ISO 800. The other thing is the exposure time. With a flash you can set that from 1/100 to 1/20s or even longer (still depending on the amount of surrounding light).

A flexible zoom lens in the standard range is probably best: 24-70 on a full frame and 17-55 on a crop camera like yours.

If you haven't done much with a flash yet, try it on your friends/roommates/etc before going out. People in clubs won't stand 20 minutes in front of your camera, until you get the right shot.

And last but not least: Experiment!

I've done quite a lot of club photography, and a fair deal in other dark places like theatres.

Personally I'd recommend not using a flash. A flash completely changes the atmosphere: yes, flashes let you capture the people, instantaneously as they were, (probably posing for your camera...), but you won't capture how it felt to be there.

Shooting without a flash is difficult. You need steady hands, a camera with decent low light performance (probably a CMOS sensor rather than CCD) the D90 is great in this respect, plenty of patience, and you need to be prepared to deal with noisy images afterwards.

Some tips:

• get to know your camera really well: in particular how to adjust exposure compensation and ISO as quickly as possible in the dark when you can't see anything. (On the D90 get used to using the menu buttons as modifiers for the adjustment wheel without having to look to see which one you want). Also, get used to using the focus lock button!

• practise using all the available light: try taking photos on the street at night, using only the illumination from street lights. In very low light you can still easily take sharp pictures if the subject is in silhouette against a light source, for example.

• don't fight the dark Your photos are going to be dark, because the club was dark! Don't fight this, but make sure that there is still interesting detail: very rarely can you fill the frame with light.

• experiment, and try lots of things: Don't just take the same sort of photo all night: move around and capture as lots of angles and subjects

• use a wideangle lens, and learn to shoot without looking: if you don't have to have your eye to the viewfinder you can capture lots more angles, and catch things faster than if your camera is glued to your face.

• enjoy yourself: It's no fun taking photos if you're not taking part in the party :)

_{(P.S. my favourite lens for this -- and most other things, to be honest -- is the 10.5 DX fisheye ;)}

See this, by Mozilla-hacker-turned-nightclub owner Jamie Zawinski. It is awesome:

Nightclub photography: you're doing it wrong.:

You may be unsurprised to learn that I have opinions about nightlife photography.

I'm not the world's greatest photographer, but I take a lot of photos in nightclubs, and I spend a lot more time than that sifting through other people's photos.

This means I see a lot of crappy photos, and I see a lot of different people making the same mistakes over and over again. So here's some advice for those of you shooting inside a nightclub that I believe will dramatically increase the quality of your photos.

Most of this is aimed at people using SLRs with real lenses, but some of it will apply to smaller cameras too.

The individual points are:

• Stop using your flash.
• Stop using a zoom lens.
• Stop standing at the back of the room.
• But, stop standing right at the front of the stage.
• Stop standing still.
• Look around first.
• Stop checking the back of the camera after every shot.
• Stop posting every damned photo.
• Your first shot was the best shot.
• Don't post almost-identical photos.
• Don't post the photo you almost got.
• Post big photos, not just oversized thumbnails.
• Don't post photos where people look like crap.
• Lose the giant watermark.

And each of those is backed up by a short (or long, in some cases) highly-opinionated and entertaining paragraph. Of course, it's a rant, so it's not exactly what one might call fair and balanced, but it's still great stuff. Really, you should go read it all. A lot of this is good advice for many situations beyond nightclubs too.

(I'm marking this answer community wiki, since this isn't really an answer, let alone my answer; just a pointer to someone else's article which serves an answer.)

I shoot photos at a nightclub and I may not be the best at giving advice as I could consider myself an advanced amateur. I shoot many photos at night and that is actually mainly what I do as far as photos go. Here is some of the advice I can give you.

TTL flashes are gold, but they don't produce consistent photos as the lighting changes constantly, but if you don't use one there will be too much grain and the photos will have VERY poor exposure in most cases unless your using a f/2.8 lens or faster.

Set your exposure to a few seconds or between 2-5 seconds. Why? Because if you use the flash and set it off it will freeze them and then the longer exposure will bring out the darkness in the background and make it look lively.

Trial and error is a big thing, you will make mistakes but that can be combated by taking a lot of photos.

Expect mixed reactions when the camera is going around, anything from running away scarred to complete excitement.

Make sure you have plenty of batteries for both the camera (CHARGE YOUR BATTERIES BEFORE HAND) and the flash batteries or keep battery packs for the flash charged as well.

Also keep your iso between 640-1600, anything over 1000 might be too harsh but use that and keep your aperture between f/2.8-f/9.

Have fun and good luck :)

Adding up to other answers, To get some unique shots follow these:

• Flash off and use club lights creatively
• Use slow-sync flash method to get the dance of people frozen(with blur).

I've done some metal concert photography and I go with a prime lens. Earlier I only had a 28mm 1.8, but next time I will go with a 50mm 1.4. Automatic settings don't work well, so I go fully manual; manual focus, manual metering, manual flash. Yep, unlike Matt's answer about not using a flash, I do have a speedlite with me. Swiveled up to the side and with a soft-box, and I manually set the strength , too. 1/32-1/64, aka fill flash. And I turn it on and off between shots, depending on the amount of smoke in the air and whatnot. I also move around like a ninja. I am very lucky that the concerts I shoot I am even allowed to crawl around on the stage itself, so I can get close to the drummer and shoot over the shoulders of the band and see the audience from their perspective.

Examples:

I'm gonna get right to the point. Here are my settings after lots of experimentation.

My camera, as do most, allows me to register a custom setting. Here's how I set one of the 3 available custom settings: (NOTE: Your flash settings will not be registered, so don't forget to set it before you start shooting ;-)

1. ISO 400 (with my camera I can easily go 1600 but I don't! Most people you photograph will be looking to see themselves and just a tiny view of the background)
2. Shutter Speed 1/4 Seconds (I go down as far as 0"4 when I wanna create trails with the lights)
3. F Stop 5.6 (for anything less than 5.6 you're risking un-sharpness)
4. Manual Flash at 1/4 power (I found out TTL doesn't always work because the camera gets confused by the club's lighting)

Ok, good luck and post a link to your nightclub photos, I'm always looking forward to checking out what others are shooting.