Auto Bracketing (M-REC Mode Only)

Why Auto Bracketing?

In many situations, we have only one chance to capture the scene. Hence, this photo-taking activity cannot fail. Composition can be verified with the LCD monitor; but, in general, exposure will not be so precise even with the help of the LCD monitor. That is, subtle details may not be seen on the small LCD monitor. What we frequently do is to take a number of shots of the same scene, each of which has a slightly different (aperture, shutter speed) combination so that, hopefully, one of them would show all the details with a "perfect" exposure.

Normally, we use a base (aperture, shutter speed) combination, take a shot, increase and/or decrease the exposure with exposure compensation, take another shot, and so on. This is a tedious procedure, and auto bracketing is designed to automate this process.

With 995, once a (aperture, shutter speed) combination is selected and auto bracketing is activated, you will be able to take a number of images, each of which has a different exposure compensation value. If the original (aperture, shutter speed) combination is reasonable, hopefully, one of these images would be exposed perfectly.

Activating Auto Bracketing

To activate auto bracketing, follow the procedure below:

1. In M-REC press the MENU button twice to enter the second M-REC menu. The following menu appears (below left). Then, press the down arrow of the multi-selector to highlight BKT (below right).

2. Press the right arrow of the multi-selector to select this option. Three options appear as shown below.

   There are two auto-bracketing features, one for exposure and the other for white balance. We only discuss the exposure bracket on this page. Refer to White Balance Bracketing for the details. The meaning of these options are as follows:

   Off	Turn off all auto-bracketing capabilities
   On	Turn on the auto-bracketing capability
   WB Bracketing	Turn on the auto-bracketing capability

   If you want to turn off the bracketing capability, press the right arrow of the multi-selector button to select it.

3. If you want to use the exposure auto-bracketing feature, press the down arrow of the multi-selector to highlight On, followed by the right arrow to select. Then, the following menu appears:

   There are six selections:

   Bracketing Option	No. of Images	Compensation Increment
   3, ± 0.3	3	+0.3 stop, 0 stop, and -0.3 stop, in this order
   3, ± 0.7	3	+0.7 stop, 0 stop, and -0.7 stop, in this order
   3, ± 1.0	3	+1 stop, 0 stop, and -1 stop, in this order
   5, ± 0.3	5	+0.7 stop, +0.3 stop, 0 stop, -0.3 stop, and and -0.7 stop, in this order
   5, ± 0.7	5	+1.3 stop, +0.7 stop, 0 stop, -0.7 stop, and and -1.3 stop, in this order
   5, ± 1.0	5	+2.0 stop, +1.0 stop, 0 stop, -1.0 stop, and and -2.0 stop, in this order

   Use the above table to determine (1) how many images you want per bracketing, and (2) what increment should be used. After a decision is made, use the up or down arrow to highlight the option, and use the right arrow to select. The following image shows that option 5, ± 0.3 is highlighted. If this option is selected, in a sequence of five images (i.e., pressing the shutter release button five times), the compensation values to be automatically applied are +0.7 stop, +0.3 stop, 0 stop, -0.3 stop, and -0.7 stop.

4. Once the above steps complete, press the MENU button to return to the M-REC shooting mode.

   Note that turning the camera off cancels auto bracketing..

How to Use Auto Bracketing?

After activating auto bracketing, you will see a blinking +/- sign on the control panel (left image below) and BKT followed by the compensation value on the LCD monitor (right image below). This value indicates the exposure compensation to be applied to the next shot.

Control Panel	LCD monitor

Suppose we choose 3, ± 0.7 The LCD monitor will display BKT +0.7, indicating the exposure compensation of the first shot. This is shown in the right image above. After taking a shot, the LCD monitor display changes to BKT 0, indicating the next shot has no compensation. After the second shot, the LCD monitor displays BKT -0.7, which gives the compensation of the third shot. After three shots are taken, the LCD monitor displays the compensation for the first shot. Therefore, if you do not want bracket anymore, you have to go through the above procedure to turn off the auto bracketing feature.

Note that the exposure compensation to be used in an auto bracketing operation is applied to the final exposure value a photographer selected, which includes exposure compensation set by the +/- button. This is sometimes necessary because the "ideal" exposure could be more than 2/3 stop away from the one chosen by the camera exposure meter. Let us take a look at an example. In the right image above, the photographer has set exposure compensation to +0.7 stop. If 3, ± 0.7 is used, the actual exposure compensation values used are +1  1/3 (=2/3 + 2/3) stop, +2/3 (=2/3 + 0) stop, and +0 (=-2/3 + 2/3) stop.

The following shows a sequence of shots that illustrates the effect of auto bracketing. Back-lighting (i.e., light source from behind of the subject) is a difficult lighting situation and may fool the camera exposure meter. A scene with very complex lighting is another challenging exposure. In these cases, auto bracketing provides an easy way of overcoming this problem. These images were taken with auto bracketing set to 5, ± 0.3, and, as a result, the exposure compensation values are +0.7 stop, +0.3 stop, 0 stop, -0.3 stop, and -0.7 stop. The image taken with BKT 0 is darker than the actual color. This is because the background is much brighter than the main subject, and the camera exposure meter is fooled to believe that the scene is brighter. Therefore, the image is slightly under-exposed. With the auto bracketing capability in hand, we can take five shots in a row with an automatic exposure compensation from +2/3 stop down to -2/3 stop. In the images below, the one taken with BKT+0.7 delivers an image with a tonality close to the real subject.

BKT+0.7	BKT+0.3	BKT 0

BKT-0.3	BKT-0.7
Click on the image to see a larger one