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<p>[QUOTE=&quot;-jeffB, post: 3039018, member: 27832&quot;]It&#039;s the <a href="https://advancedphototech.wordpress.com/lenses/mirror-mirror-a-guide-to-choosing-and-using-mirror-lenses/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://advancedphototech.wordpress.com/lenses/mirror-mirror-a-guide-to-choosing-and-using-mirror-lenses/" rel="nofollow">mirror lens</a>. It uses curved mirrors instead of (or in addition to) lenses, and because of the way they&#039;re arranged, there&#039;s an obstruction in the <i>middle</i> of the aperture, instead of the usual iris around the edge. That means out-of focus highlights are donut-shaped, and extended out-of-focus areas look like, well, the original images we&#039;re talking about.</p><p><br /></p><p>But you wouldn&#039;t use one of those lenses for close-up work, so I&#039;m wondering what <i>is</i> going on...[/QUOTE]</p><p><br /></p>

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