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Each shot should overlap the previous one in the series, as illustrated by Figure 7.9, which shows you the raw images that I used to create the panorama in Figure 7.1. The overlap gives the stitching software the data it needs to glue the images together. You don t need to be precise or use the same amount of overlap for each picture. However, you should check your stitching software to find out the recommended amount of overlap. A 30 to 50 percent overlap is the norm. If you re working with a panoramic tripod head, it likely offers a mechanism that helps ensure that each frame includes the right amount of overlap. You adjust a locking pin or other control to specify a percentage of overlap, and when you rotate the tripod head, it stops when it reaches the correct position.
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Check your camera manual to find out whether the camera can display a grid to help you align shots. Some models also display a portion of the previous shot to help you see where the next one should begin.
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CHAPTER 7: Creating Panoramic Images
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FIGURE 7.9 Each shot should overlap the previous one.
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Maintain Constant Distance and Focal Length
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Position the camera so that the lens-to-subject distance remains constant throughout the series of images. In an interior setting, for example, put the camera in the middle of the room. For best results, don t use an extremely wide-angle lens or long telephoto lens. Both can produce heavy distortion in the stitched panorama. A medium focal length works best. If you re working with a zoom lens, try to hit the middle of the zoom range.
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Don t change the focal length between shots. When you do, you move the lens nodal point, throwing the camera off the proper rotation axis.
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Lock in Focus
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Use consistent focusing throughout the series. For example, don t focus on an object 10 feet away in one shot and on something that s 30 feet away in the next. If your camera offers manual focusing, switch to that mode. If you must use autofocus, be sure to set the focus at the same distance for each shot.
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Shoot Like a Pro!
Remember that aperture size affects the range of sharp focus (depth of field). The smaller the aperture, the greater the depth of field. On cameras that don t offer a way to control aperture, try switching to the landscape creative scene mode, which should reduce the aperture size.
Take Control of Exposure
Working in autoexposure mode can cause problems unless the lighting is even throughout the scene. As an example, see Figure 7.10, which shows two frames from a 360-degree VR panorama of a living room. Because of differences in ambient light between the two shots, the overlapping area is darker in one shot than the other. In the stitched panorama, this creates an abrupt change that makes the seam noticeable, as FIGURE 7.10 When light isn t consistent throughout a scene, shooting in autoexposure mode can result in significant shifts in brightness shown in Figure 7.11. levels from frame to frame. Shooting panoramas in automatic exposure mode may create shifts in focus between frames as well as lighting breaks. Again, when aperture size changes, depth of field changes as well. For more on this issue, see 2. The best solution is to work in manual exposure mode, basing the exposure on the average lighting conditions throughout the panoramic view. If your camera doesn t offer manual exposure, see whether it provides FIGURE 7.11 In the stitched panorama, the exposure difference makes the autoexposure lock, seam noticeable. which tells the camera to keep using the same exposure setting until you specify otherwise.
CHAPTER 7: Creating Panoramic Images
For cameras that don t offer either feature, aim the camera at an area of medium brightness as you set the autoexposure for each shot. After you press the shutter button halfway down to set the exposure, reframe the shot as necessary. Remember, however, that some cameras set focus as well as exposure when you depress the shutter button half way. As with any photographic project that involves tricky exposure issues, always bracket your shots, taking each image at three different exposures. You can use the camera s EV (exposure value) control or autobracketing feature, if available, to adjust image brightness between shots.
Shooting outdoor panoramas on overcast days helps solve the exposure variation problem because the clouds eliminate strong highlights and shadows. If you want a clear sky in your panorama, shoot at midday, when the sun is directly overhead and doesn t cast strong shadows on the landscape.
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