David Pogue

The best camera, the saying goes, ?is the one you have with you?. The chances are very low that your cellphone is your best camera; it doesn?t zoom, can?t take pictures in low light, can?t freeze action and generally takes mediocre photos. But it?s the camera you have with you most often. No wonder cellphones have become the most popular cameras on earth.

Especially the iPhone. Its camera is just OK?it?s a 5-megapixel job with decent colour and clarity, as long as the subject is holding still. But lately, apps have been putting this thing on the photographic map. The iPhone is, let?s face it, really an iComputer. And since it can be controlled through software, the world?s programmers have wasted no time in examining the iPhone camera and adding to, or replacing, its features.

This is no niche software category; we?re not talking about recipe-management software or genealogy software. The photo-apps category on the App Store is teeming with options?4,000 of them priced at a dollar or two; 2,500 are free? and they?re hugely popular with iPhoners. Some of the apps are meant to replace Apple?s own camera app. Many more extend your creative options by adding filters, editing tools, time-lapse features and panoramas. Most have tendrils shooting right into Facebook, Twitter, Flickr and wherever else fine cellphone photos are shared online.

To save you the four years (and thousands of dollars) it would take you to try out all 6,500 apps, here?s a handy cheat sheet. These are the coolest, best and most useful photo apps for the iPhone, as recommended by my colleagues, my photographer friends and my Twitter followers. These apps are, to use the technical term, wicked cool.

Camera-app replacements

The iPhone?s camera-taking app is fine. But it?s slow to start up, slow to save a photo, slow to focus. Turning the flash on or off is clumsy, requiring two taps on transparent, hard-to-read buttons. If you replace it with an app like QuickPix ($2), all of those problems go away. The app opens much faster than Apple?s, takes photos much faster and can even snap stills while you?re shooting video. The flash is a single icon that you tap on or off. Put this on your home screen where Apple?s Camera app sits, drag Camera into a folder somewhere, and you?ll miss a lot fewer shots.

People also rave about Camera+ ($2)? not because it?s faster, but because it does so much more. The Stabilisation feature, for example, ends blurry shots, because it doesn?t fire the shutter until the phone?s motion sensor detects that you?re holding it still for a split second. There?s a self-timer and two-a-second burst mode. It features a 6X digital zoom and allows users to set independent focus and exposure points by tapping the screen. You can crop, rotate or sharpen a photo, add a border and apply effects to it?and unlike most of the effects apps, this one lets you control the effect intensity.

When you?re finished toying, you can send your masterpiece directly to Facebook, Twitter, Flickr or e-mail. Pro Camera ($2) a similar, more crisply designed, more sprawling app, adds things like independent focus and exposure points, full colour-correction tools and a 6X digital zoom that works surprisingly well. The high-end crowd swears by it.

Filter app

A filter, in digital photo lingo, is a special effect: turning a photo black-and-white, for example, or making it look grainy, oversaturated, faded, ancient or in some other way degraded. For $1, you can?t beat the attractiveness and creativity of 100 Cameras in 1. It works with both existing photos and new ones you take, and it lets you combine its effects (100 of them, get it?). The names of these filters are charming. They?re called things like ?Hurried and anxious,? ?The warm chocolate that we ate slowly? and ?A bold thing to say so early in the morning.?

One tap sends your doctored masterpiece to Facebook, Twitter, Flickr, Smugmug, Dropbox, e-mail or a printer. Hipstamatic ($2) is white-hot on iTunes these days. It turns the screen of the iPhone into a perfect replica of a cheap plastic toy camera of days gone by; by swiping your finger across the lens or the flash or the film window, you can choose different lenses, flashes or film types.

Specialty photography

Most people?s iPhone ambitions extend no farther than snapshots. But there?s no reason to stop there. Tilt-shift photography is easier to understand by seeing it (search ?tilt shift? on Flickr.com) than reading about it. But in essence, it?s a photographic trick that, by using selective angles and blurring, makes the real world seem to be made of tiny toys.

Programs like Time Lapse ($1) let you lash down the phone and let it create a high-definition time-lapse movie for you automatically while you?re away. Watch a building go up, watch a flower bloom or just see what?s been going on at home while you?re away.

Before you lay out the big two bucks, though, try Microsoft?s PhotoSynth (free). Yes, you read that right. It?s a Microsoft app for the iPhone. And it?s crazy amazing. You can shoot all around you, capturing entire interiors, for example, including floor and ceiling, one slice at a time. Each time you move the camera to a new view, there?s a beep and then PhotoSynth snaps the shot all by itself. The app uses the iPhone?s gyroscope and motion sensor to figure out how you?re holding the phone.