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Lens's are are major factor here more than camera. The thing is that they should do a test of the lens and thats the easy part. I am sure there is a lens test chart you can download, print off and do a visual assessment as a starter. One doesn't come to mind at the moment
Tony
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Clarity can exist only when there is freedom to observe, when one is capable of looking, observing, watching. That is possible when there is complete, total freedom, otherwise there is always distortion in our observation.
J Krishnamurti - Buddhist
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