Advanced Techniques

Using a DSLR manually

Written by Bernard Dery

Focusing and exposing manually with your camera will sometimes yield better results than solely relying on its auto or semi-automatic systems.

Manual exposureModern digital single lens reflex cameras have very accurate exposure and autofocus systems. However, relying solely on your camera’s auto or semi-automatic systems will not always yield the results you want. For macro, portraits, architecture, night photography and many other situations, taking control of the camera manually can be a necessity.

This article covers the basics of manually operating your camera. The first section covers exposure, the second concentrates on focus.

Manually exposing with a DSLR

In order to manually expose with your camera, the first step is of course to select the Manual (M) mode. This lets you control aperture, shutter speed and ISO.

Some cameras let you make an automated exposure metering even when in M mode, and this can be a good start to set your exposure. This is often achieved by pressing the AE (auto-exposure) button, or by pressing a dedicated button (like the Green button on Pentax DSLRs). Fine-tuning around that starting point will save you time.

Aperture ringSome older lenses have an aperture ring, located near the camera body on the barrel of the lens. The ring can be used to select the aperture value directly. Each camera operates differently with an aperture ring, so be sure to read your manual before using this for the first time.

You might find that some tweaking of your exposure setting is necessary to achieve the desired effect. Do not hesitate to take a few test pictures while setting your camera.

Once the proper exposure is decided, you do not have to change your settings again until the lighting conditions change. This can, in fact, speed up your process if you are in a controlled environment such as in a studio or under constant sunlight.

When manually setting your exposure while taking night pictures, be wary of your LCD screen. It is very easy to over- or under-expose when dark areas and bright light sources are combined in one frame.

Focusing manually with a DSLR

Focusing manually seems like a difficult process for many people. However, until the 80’s, this was the only way to focus! With a little practice, focusing manually can become almost second nature.

A bright viewfinder greatly simplifies manual focusing. Sadly, not all cameras are created equal. Some entry-level DSLRs have darker viewfinders with a smaller magnification. A lens with a smaller maximum aperture will also darken the viewfinder and make manual focus more difficult.

Manual focus film cameras had viewfinder screens designed to help the user focus manually. Some modern cameras offer the possibility to replace the stock viewfinder screen by an optional one with the same characteristics. These screens usually have a split image circle in the center. Focus is achieved when the two split images are properly aligned.

What to do when you do not have access to a split image screen (which is most of the time)? If you focus by looking through your viewfinder, the first rule is to take your time.

How to focus

Turn your focus ring slowly, while looking through the viewfinder. You will see your image sharpen as you improve focus, then it will become blurred again when you move past the focus point. Come back slowly towards the focus point, and fine-tune your focus. A few back-and-forth movements can be necessary, but after some practice the process will come naturally.

If your camera has a live view mode, this can be used to make manual focus easier. Most cameras with live view allow the user to zoom on the display, giving you an enlarged view of your scene. Using the routine described in the previous paragraph, you should get sharp images each time. Note that manually focusing with live view is often easier when using a tripod.

Some cameras allow users to trick the AF system into working with manual lenses. Called “catch-in focus”, this will only work with a manual focus lens. Simply leave the camera in AF mode, press the shutter completely, and slowly rotate the focus ring. The camera will take the picture when you reach the correct focus point. This might not work with all brands and models, however.

Keep in mind that, for most zoom lenses, you cannot assume that the focus remains constant when you zoom in or out. It will be necessary to adjust focus again each time you change the focal length.

Even though using a camera manually can be daunting at first, taking control of focus and exposure can be the only solution when all else fails. With a little practice, it will become easy and instinctive.

Sunny 16 rule

The “sunny 16” rule of thumb is based on ambient light rather than light reflected from the subject. It suggests that on a sunny day, you should set your aperture to f16 and your shutter speed to the reciprocal of your ISO value. [More info]

About the author

Bernard Dery

Bernard was born and still lives in Quebec City, Canada. A doctorate candidate in Physics, Bernard works full-time as an optical designer at EXFO, a world leader in telecom tests and measurements tools. His professional interests go from fiber optics to atmospheric data collection and lasers.

His first contact with photography was a Vivitar fixed lens camera that he had purchased at age eight. His interest developed slowly, and for many years Bernard limited himself to family and travel pictures.

Bernard discovered the world of digital photography in February 2004, when he purchased his first digital camera. Developing an interest for composition, he experimented with many subjects: landscapes, nature, cities and architecture.

Bernard
soon began to invest more time and energy into his new found hobby, finding new and beautiful subjects to capture everyday. His challenge is to capture the mood and emotion carried by a scene as it presents itself to him.

A trip to Italy in
September 2004 fueled his growing interest with numerous magical photography opportunities.

Bernard and his wife like to spend free time near a lake at his family's summer house, where he finds new subjects to capture every day. His interests are varied and include hiking, camping, swimming, boating and reading, as well as most winter
sports.

Bernard, known as bdery on forums, uses a Pentax K20D and W80, Canon S2 and a Nikon SQ as a backup.

Thumbnails are of photos by Bernard Dery - used with permission
Copyright Bernard Dery All rights reserved

4 Comments

  • I am using Nikon D80 manually (A mode with an extension tube. For some unknown reason to me I cannot set an aperture value. I have also tried other modes also with no aperture. Any suggestions? thanks

  • midhum, I’m not quit sure I fully understand you but let me give it a shot. My guess is that you’re looking at images at 100% resolution. Digital photos, imho, always look better when reduced in size. In effect, you’re looking at your images reduced in size on the LCD. Personally, I never judge an image full sized. Related reading >>

  • I am losing clarity with photos when transferred to computer but it looks perfect when seen on camera LED. Could you help me please?