I gather that common wisdom says that in addition to camera position you should keep as many variables as possible the same between different shots for a panorama. Variables that spring to mind are (some obviously closely related):
- Shutter speed
- Aperture size
- ISO sensitivity
- Focus
- White balance
Which of these is it strictly necessary to lock, and most importantly... why?
For example, in a landscape panorama including the sun, it would be quite difficult (if not impossible) to choose fixed exposure settings for the entire scene. However panorama software I've used typically does a marvelous job of ironing out any differences between images.
Similar questions apply to focus, if you lock focus for a particular shot, can you be sure that others will not be out of focus? (is that likely to happen with a narrow aperture, say f/8?)
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