What is a Silhouette?
In photography, a silhouette is defined as an outline that appears dark against a light background. More specifically, it is where your subject is seen as a black shape without detail against a brighter background. This is an artistic outcome that many photographers like to perfect. This effect can be achieved with any kind of bright light source, but of course the most commonly used is the sun around sunrise or sunset. The backlighting from the sun shadows everything towards you and produces this effect.
Silhouette Techniques
When you are getting ready to take your silhouette pictures, there are a couple things to keep in mind. These tips work for both digital and film photography. Make sure you never point the lens directly at the sun. If there is too much light, the light will fall on your object. If there is not enough light, your background will become gray. The main key to silhouette lighting is having your background lighter than your object, but this can be done in more ways then one. Many photographers focus on a certain time of day, where their subject is, what kind of weather there is, and where the sun positioned in the frame.
I choose to take my silhouette photos when the sun is right above the horizon, usually at sunset. I prefer this time because the sun causes the sky to be at it’s brightest for a greater contrast between your object and the sky. Try aiming at your object with the sun directly behind it for a glow around your silhouette. Also, if the sky is too bright and your object is small, it is possible to underexpose your silhouetted image.
I always use a narrow aperture (high f/stop) so the camera captures the whole scene in focus. It is also convenient to use this method so you can use your camera’s automatic exposure settings focused on the lighted background. If you use a point-and-shoot camera focused on the subject meant to be dark, the camera will probably try to compensate for the lack of light on the subject and overexpose the background. So when you have your camera set on automatic exposure, be sure to focus on the light in the background.
Remember that there isn't an exact science to taking a great silhouette. It takes practice, experimentation, and maybe even a little luck to capture a truly spectacular silhouette photo.
Exposure is the amount of light collected by the sensor in your camera during a single picture. If the shot is exposed too long the photograph will be washed out. If the shot is exposed too short the photograph will appear too dark. Almost all cameras today have light meters which measure the light in the given shot and set an ideal exposure automatically. Most people depend on the light meter which is fine, but if you know how to control your exposures you can get some creative and sometimes better pictures. (The photo on the left is with low shutter speed and narrow aperture (high f/stop).
You might wonder why there is not just a constant shutter speed or a constant aperture so that you would only have to worry about one control. The reason is that even though they both control the amount of light getting to the sensor they also control other aspects of the picture. Shutter speed for example can be used to freeze subjects in midair with a fast speed or it can be used to blur water with a slow speed. Aperture controls the depth-of-field which is what is in focus in the picture. Aperture can be used to draw attention to one subject (like the flower on the right) by blurring the background with a wide aperture (low f/stop). Aperture can also be used to focus everything in a picture with a narrow aperture (high f/stop). (The photo on the left is with Wide aperture (low f/stop) and corresponding shutter speed).
Tip 2: Use a telephoto lens. Getting closer to the action, yet staying a safe distance, is the key to photographing wildlife. By keeping your distance you allow the animal to be in their comfort zone and are more likely to get natural behavior. Safety is also a factor when photographing in the wild. Always keep at least 100 yards distance from wildlife, for your safety and for the well being of the animals. Another good use for a telephoto lens is a trick not many people know, which comes in very handy when photographing animals in the zoo that are behind fencing. If you move close to the fence (keep a safe distance) and use at least 100mm of your telephoto lens, focusing beyond the fence, with a wide aperture, you can "focus out" the fencing and take a photo of the subject with no wires! Now, there are some exceptions, such as, if the fencing is black you’ll have a much better chance of pulling this off. Regular chain link fence is gray and semi-reflective, which in the sunlight can cause a glare and is often too bright to focus out. I’ve also had some successes at trying different angles, so experiment for your best results. I often shoot with a Canon 100-400mm IS USM and a Canon 28-300mm IS USM. If you're new to telephoto lenses, on a budget and not sure what to get, I suggest the Tamron 28-300mm or a Sigma 70-300mm. I've also had great results with the Sigma 50-500 which, as of this writing, I consider to be the best bang for the buck. These lenses all work with teleconverters of 1.4x and 2.0x so you can easily extend your reach even further, often while keeping auto-focus (with Canon L lenses, a minimum aperture of 4.0 or less will support auto-focus. Above that a manual focus is your only option.)
Tip 4: Adjust your shutter speed to stop/show the action. When animals are on the move you need to decide quickly on the type of shot you want to take. If you want to freeze the action, you'll need to shoot at 1/500 or faster and depending on light, that can be tricky. One option, if you're shooting digital, is to adjust up your ISO, which will make your sensor more sensitive to light and give you that needed boost in shutter speed. Now, if you want to give a sense of motion to your image, try shooting with a shutter speed of 1/4 to 1/8 and pan your camera with the animal. Pan steady and remember, keep the eye in focus if you can! For best results, pick backgrounds that are uncluttered and simple, as this will make the subject standout in the image.
Tip 7: Composition - Framing your shots. Some simple framing advise can go a long way toward improving an image, and for those who are computer savvy, a little trick called cropping (software technique to cut a photo) can help improve composition that wasn't quite right at the time the photo was taken. The best way to think about composition is to picture a tic-tac-toe grid in the view finder of your camera (I've seen some new cameras that come with this as a feature you can turn on!) and use that grid to organize your shots. There is no hard rule, but the general theory behind good composition is that your subject lies in one of the crosshairs of the grid. Setting up your shot to lead the eye is also a good example of composition.
Bonus Tip: Shoot. Shoot. Shoot. This tip is a no-brainer for those of us who shoot digital. Shooting digital is cheap -- technology is advancing so quickly that, as of this writing, a 4 gigabyte memory card is selling for less than $100 and you can get A LOT of photos on a 4 gig memory card. The bottom line of this tip is take photos....a lot of photos. Don't be shy. I often take multiple photos of the same scene or subject and then later choose the best from the group. This is also a great way to learn; by adjusting your camera between shots you can experiment and see the results of different settings of your camera. And, don't sweat the details of trying to remember which photo had which settings...another great thing about shooting digital is something called EXIF (Exchangeable Image File Format). EXIF data is written to every photo so that later, upon review, you can see every setting your camera used to take that image.
