- Rotate camera around non-parallax point
The no-parallax point inside your lens is where you see the aperture when you look into the camera lens. Rotating the camera around this point avoids parallax error. Correcting this error is outside the scope of stitching software (although the software can fudge to make the effects less visible).
- Take photos with about 50% overlap
This is for the processing software, most importantly to perform the exposure and vignetting correction. For aligning purpose only, some 20-30% overlap would be sufficient. If you use >50% overlap, your photo series is still usable if one photo in between is spoiled (it happens).
- Take account of moving objects
Photos are taken at different times. Make sure that in the photo overlap there is an area which has not changed, so either you or the software can place the seam there. With moving objects, clouds or walking persons, try to rotate against the flow in order to avoid duplication.
- Do NOT use the camera panoramic mode
Usually the camera sets the exposure with the first photo, hence you risk to have several photos with blown highlights. These modes typically give you little control over a number of camera features you want to control. For example, you may want to expose "to the right" or set the distance manually.
- Use a tripod, possibly with panorama head, or rest your camera on a firm object.
This is again about the no-parallax point. But for non-indoor photography carefully taken handheld photos can be perfectly stitchable.
- Cover a wider range
For a cylindrical panoramic projection (less than 360deg), cover a wider horizontal range than you plan for the panoramic image, as the barrel shape projection shapes tend to limit the vertical field-of-view in the corners.
- Set the focus to manual
During a photo series you may point your camera in a direction where there are no features for the camera to focus on. Usually the default distance the camera chooses is not what you want.
- Use fixed aperture
Vignetting correcting varies slightly with aperture, so one vignetting correction setting can be used. And if your lens contains dust spots (it happens), one needs only one dustmap or flatfield for dust removal. If your camera is dust-prone, take a photo of clear sky - this can be processed into a flatfield.
- Use optimum aperture
Usually one try to reach the maximum depth of field at the best image quality in the panorama to prevent differently focused areas. This results in using a specific aperture depending on the used lens, but generally starting from f/8, f/11. Using the optimum aperture has more influence on the resulting sharpness than lens quality.
- Shoot in RAW Mode
Shooting in RAW Mode allows you to correct the white balance, (to a certain extent) the exposure and some other parameters depending on the used software. Generally speaking the RAW format provides the most flexibility whilst requiring the most disk space.
no longer necessary
Some things that were necessary in the distant past but are no longer:
- avoid rolling the camera (software can accomodate that)
- use special camera panorama mode
- get precise overlap in the camera display
- take sequence at fixed exposure and white balance (still beneficial but can be corrected to a certain amount)
The next step after photography is stitching.