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<p>[QUOTE=&quot;dougsmit, post: 4652138, member: 19463&quot;]Simple lenses do not have a flat plane of focus.&nbsp; Two or more elements or aspherical elements can flatten things and improve edges BUT there are optical laws that make even the best lenses fall off across the field.&nbsp; There are $2 lenses and $2000 lenses. We pick what fits our needs.[/QUOTE]</p><p><br /></p>

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