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    <title>topic Who let the cat out? in EF &amp; RF Lenses</title>
    <link>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186236#M7255</link>
    <description>&lt;P&gt;I got my old FD 500mm f8 Cat lens out for some playtime. &amp;nbsp;Of course the birds were not cooperative. So what else, shoot their house!&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;IMG src="https://community.usa.canon.com/t5/image/serverpage/image-id/10762i654F5024D15CB9ED/image-size/original?v=v2&amp;amp;px=-1" border="0" alt="_52D3729.jpg" title="_52D3729.jpg" /&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;Catadioptic reflex telephoto mirror lenses don’t autofocus. Plus, their smaller apertures (f/8 for my 500mm) make accurate manual focusing difficult. Secondly, there are no such lenses with image stabilization. They can produce doughnut shaped out of focus highlights, mistakenly called Newton's Rings sometimes. They vignette more than&amp;nbsp;&lt;/SPAN&gt;refractor&lt;SPAN&gt;&amp;nbsp;lenses do typically.&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;No lens correction in LR, darn!&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;Used on my 1D Mk IV with an Ed Mika glassless converter.&lt;/SPAN&gt;&lt;/P&gt;</description>
    <pubDate>Fri, 23 Sep 2016 19:43:42 GMT</pubDate>
    <dc:creator>ebiggs1</dc:creator>
    <dc:date>2016-09-23T19:43:42Z</dc:date>
    <item>
      <title>Who let the cat out?</title>
      <link>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186236#M7255</link>
      <description>&lt;P&gt;I got my old FD 500mm f8 Cat lens out for some playtime. &amp;nbsp;Of course the birds were not cooperative. So what else, shoot their house!&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;IMG src="https://community.usa.canon.com/t5/image/serverpage/image-id/10762i654F5024D15CB9ED/image-size/original?v=v2&amp;amp;px=-1" border="0" alt="_52D3729.jpg" title="_52D3729.jpg" /&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;Catadioptic reflex telephoto mirror lenses don’t autofocus. Plus, their smaller apertures (f/8 for my 500mm) make accurate manual focusing difficult. Secondly, there are no such lenses with image stabilization. They can produce doughnut shaped out of focus highlights, mistakenly called Newton's Rings sometimes. They vignette more than&amp;nbsp;&lt;/SPAN&gt;refractor&lt;SPAN&gt;&amp;nbsp;lenses do typically.&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;No lens correction in LR, darn!&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;Used on my 1D Mk IV with an Ed Mika glassless converter.&lt;/SPAN&gt;&lt;/P&gt;</description>
      <pubDate>Fri, 23 Sep 2016 19:43:42 GMT</pubDate>
      <guid>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186236#M7255</guid>
      <dc:creator>ebiggs1</dc:creator>
      <dc:date>2016-09-23T19:43:42Z</dc:date>
    </item>
    <item>
      <title>Re: Who let the cat out?</title>
      <link>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186239#M7256</link>
      <description>&lt;P&gt;Cat?&amp;nbsp; I think they took one look at your lens and thought, "SHOTGUN!" &lt;img id="smileylol" class="emoticon emoticon-smileylol" src="https://community.usa.canon.com/i/smilies/16x16_smiley-lol.png" alt="Smiley LOL" title="Smiley LOL" /&gt;&lt;/P&gt;</description>
      <pubDate>Fri, 23 Sep 2016 18:07:52 GMT</pubDate>
      <guid>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186239#M7256</guid>
      <dc:creator>Waddizzle</dc:creator>
      <dc:date>2016-09-23T18:07:52Z</dc:date>
    </item>
    <item>
      <title>Re: Who let the cat out?</title>
      <link>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186244#M7257</link>
      <description>&lt;P&gt;Maybe!&amp;nbsp;&lt;img id="smileywink" class="emoticon emoticon-smileywink" src="https://community.usa.canon.com/i/smilies/16x16_smiley-wink.png" alt="Smiley Wink" title="Smiley Wink" /&gt;&lt;/P&gt;</description>
      <pubDate>Fri, 23 Sep 2016 19:39:56 GMT</pubDate>
      <guid>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186244#M7257</guid>
      <dc:creator>ebiggs1</dc:creator>
      <dc:date>2016-09-23T19:39:56Z</dc:date>
    </item>
    <item>
      <title>Re: Who let the cat out?</title>
      <link>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186248#M7258</link>
      <description>&lt;P&gt;The young lady stopped by for a bite. &amp;nbsp;Finally. &amp;nbsp;They must be thinking about the long flight ahead of them.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;IMG src="https://community.usa.canon.com/t5/image/serverpage/image-id/10763iD615BF47F9BCE953/image-size/original?v=v2&amp;amp;px=-1" border="0" alt="_52D3739-Edit.jpg" title="_52D3739-Edit.jpg" /&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;FD 500mm f8 Cat lens on a 1D Mk IV. 500mm, f8, SS 1/1000 at ISO 800. &amp;nbsp;No IS. No lens correction in LR. No AE or AF, no nothing. Hand held. &amp;nbsp;I love it! &amp;nbsp;They way it is supposed to be.&amp;nbsp;&lt;img id="smileywink" class="emoticon emoticon-smileywink" src="https://community.usa.canon.com/i/smilies/16x16_smiley-wink.png" alt="Smiley Wink" title="Smiley Wink" /&gt;&lt;/SPAN&gt;&lt;/P&gt;</description>
      <pubDate>Fri, 23 Sep 2016 20:17:55 GMT</pubDate>
      <guid>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186248#M7258</guid>
      <dc:creator>ebiggs1</dc:creator>
      <dc:date>2016-09-23T20:17:55Z</dc:date>
    </item>
    <item>
      <title>Re: Who let the cat out?</title>
      <link>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186251#M7259</link>
      <description>&lt;P&gt;Sisters.............&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;IMG src="https://community.usa.canon.com/t5/image/serverpage/image-id/10764i98BDFDDFB2E1BB3F/image-size/original?v=v2&amp;amp;px=-1" border="0" alt="_52D3740-Edit-Edit-Edit.jpg" title="_52D3740-Edit-Edit-Edit.jpg" /&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;SPAN&gt;FD 500mm f8 Cat lens on a 1D Mk IV. 500mm, f8, SS 1/1000 at ISO 800.&lt;/SPAN&gt;&lt;/P&gt;</description>
      <pubDate>Fri, 23 Sep 2016 20:55:33 GMT</pubDate>
      <guid>https://community.usa.canon.com/t5/EF-RF-Lenses/Who-let-the-cat-out/m-p/186251#M7259</guid>
      <dc:creator>ebiggs1</dc:creator>
      <dc:date>2016-09-23T20:55:33Z</dc:date>
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