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A recent capture is producing a coarse, fuzzy PTM, even though the individual RAW shots were high quality. I had trouble with the process of highlight capture because the spheres seemed to be out-of-round (distorted), and it was impossible center the guide circle on the image of the sphere. I am assuming this led to a registration problem in the PTM, hence the poor quality. These were shot on a 24–105 Canon L series zoom, on 60 mm, with the sphere right in the corner of the frame. Am I right in thinking that: 1) zooms should be avoided and macros used where possible for their typically flat fields and lack of barrel distortion. 2) the spheres should not be placed in the extreme corner of the frame but closer to the center on the edge. Feedback welcome.