Matt wrote:

Hey Paul,

One suggestion which might help yield more useable overlays is to
have the photographer zoom the camera in to provide the tightest
view, and then stand as far from the subject as possible, and
still have the subject fill the viewfinder.  This will improve
the geometry of the shot, and reduce (parallax?) error.

True, but you might want to limit the photo to 3/4 or 7/8 of the overall
frame.  Beyond that and aberration (spheric, chromatic, and other)
starts to be real problem with consumer grade lenses, especially in the
corners.

1. Get as far away from the subject as possible.  Keep in mind that this
might be limited, for example: by the need to be perpendicular to the
firewall.
2. Zoom in until the subject fills 3/4 or 7/8 of the frame.
3. If the maximum results in less than 3/4 or 7/8 of the frame, get
closer to the subject until it does.
4. Save & upload the image in a lossless format such as RAW or TIFF.

Russell Kent


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