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		<title>Canon EF 800mm f/5.6L IS USM Lens</title>
		<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/</link>
 		<description>Overview

This is the longest telephoto lens among Canon's lineup, and a terrific choice for any long-distance application-outdoor sports, wildlife, news photojournalism, and so on. It's actually lighter than Canon's EF 600mm f/4L IS lens, weighing just under 10 lbs. It uses a refined optical design, with two fluorite lens elements, one UD element, and one Super-UD-glass element, for outstanding correction of color fringing and superb contrast and sharpness. This super-telephoto lens uses magnesium-alloy barrel construction to enhance its light weight, and has weather-resistant gaskets throughout for use in harsh conditions. It's compatible with both the EF 1.4x II and 2x II tele extenders for even more reach: EOS cameras with 45 AF points will continue to provide autofocus at the center AF point when the lens is used with the 1.4x extender. Finally, it's image stabilized, providing up to 4 stops of correction for camera shake. This makes it even more practical in many situations.

Lens review

&amp;quot;The definite upside to the Canon EF 800mm f/5.6 L IS USM Lens' high price is that you get Canon's ultimate lens physical qualities and superb Image quality. &amp;quot;

&lt;a href=&quot;http://www.the-digital-picture.com/Reviews/Canon-EF-800mm-f-5.6-L-IS-USM-Lens-Review.aspx&quot;&gt;www.the-digital-picture.com/Reviews/Canon-EF-800mm-f-5.6-...&lt;/a&gt;

&lt;img src=&quot;http://www.usa.canon.com/app/images/Lenses_2008/EF800mm/profile/ef800_f56lisu_586x225.jpg&quot; /&gt;

Lens
Focal Length &amp;amp; Maximum Aperture
800mm f/5.6
Lens Construction
18 elements in 14 groups
Diagonal Angle of View
3° 5' (with full-frame sensor camera)
Focus Adjustment
Ring-type Ultrasonic Motor, with inner focus system; mechanical manual focus
Closest Focusing Distance
19.7 ft./6.0m (maximum close-up magnification: 0.14x)
Filter Size
52mm (Drop-in Gelatin Filter Holder)
Max. Diameter x Length, Weight
6.4 in. x 18.1 in./162mm x 461mm (maximum lens length); 9.9 lbs./4,500g </description>
		<pubDate>Thu, 17 Jan 2013 05:21:13 -0800</pubDate>
		<lastBuildDate>Thu, 17 Jan 2013 05:21:13 -0800</lastBuildDate>
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		<image>
			<url>http://farm7.staticflickr.com/6050/buddyicons/991764@N24.jpg?1320410525</url>
			<title>Canon EF 800mm f/5.6L IS USM Lens</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/</link>
		</image>

		<item>
			<title>Reply to Service Notice: EF800mm f/5.6L IS USM</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157629737725898/72157632545655382/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/48406207@N08/&quot;&gt;Djme22&lt;/a&gt; posted a reply:&lt;/p&gt;

&lt;p&gt;Has anyone contacted Canon about this?  I've just purchased a used 800mm with a serial number in that range, and it might be nice to get it into Canon's service center for a thorough once over.  I bought a used 1D III a while back and sent it to Canon for a new mirror box (which Canon did under warranty even though I told them I bought it used), and while they had it they checked it, cleaned it and polished the body, all gratis. Maybe it didn't do much in a practical sense, but it did give me a little peace of mind.&lt;/p&gt;</description>
			<pubDate>Thu, 17 Jan 2013 05:21:13 -0800</pubDate>
						<author flickr:profile="http://www.flickr.com/people/48406207@N08/">nobody@flickr.com (Djme22)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/groupcomment/72157632545655382</guid>
                        		</item>
		<item>
			<title>Reply to Service Notice: EF800mm f/5.6L IS USM</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157629737725898/72157630852600178/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/jeanrouck/&quot;&gt;Panurus biarmicus&lt;/a&gt; posted a reply:&lt;/p&gt;

&lt;p&gt;I have the same problem with the 1D-X.&lt;/p&gt;</description>
			<pubDate>Wed, 01 Aug 2012 05:21:24 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/jeanrouck/">nobody@flickr.com (Panurus biarmicus)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/groupcomment/72157630852600178</guid>
                        		</item>
		<item>
			<title>Service Notice: EF800mm f/5.6L IS USM</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157629737725898/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/alabang/&quot;&gt;alabang&lt;/a&gt; posted a new topic:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.usa.canon.com/cusa/consumer/products/cameras/slr_cameras/eos_5d_mark_iii?pageKeyCode=prdAdvDetail&amp;amp;docId=0901e02480532d6b&quot; rel=&quot;nofollow&quot;&gt;www.usa.canon.com/cusa/consumer/products/cameras/slr_came...&lt;/a&gt;&lt;br /&gt;
&lt;br /&gt;
Canon USA Issues EF 200mm f/2 L IS and EF 800mm f/5.6 L IS Service Notice&lt;br /&gt;
From Canon USA:&lt;br /&gt;
&lt;br /&gt;
To Users of the EF200mm f/2L IS USM and EF800mm f/5.6L IS USM Lenses with the Canon EOS 5D Mark III Digital SLR Camera.&lt;br /&gt;
&lt;br /&gt;
Thank you for using Canon products.&lt;br /&gt;
&lt;br /&gt;
We have confirmed that when the EF200mm f/2L IS USM and some units of the EF800mm f/5.6L IS USM lenses are used with the Canon EOS 5D Mark III Digital SLR Camera, the Lenses may emit an abnormal noise.&lt;br /&gt;
&lt;br /&gt;
The Canon EOS 5D Mark III Digital SLR Camera does not need to be repaired as a result of this phenomenon.&lt;br /&gt;
&lt;br /&gt;
The support measures for this phenomenon have been decided and they are as described below.&lt;br /&gt;
&lt;br /&gt;
Phenomenon&lt;br /&gt;
&lt;br /&gt;
If either of the Lenses is attached to the camera with the Image Stabilizer switch on the Lenses set to ON, the Image Stabilizer will synchronize with the autofocusing (AF) function and an abnormal noise may occur. This abnormal noise does not affect captured images.&lt;br /&gt;
&lt;br /&gt;
This phenomenon only occurs when the camera is used with either of the Lenses, and does not occur when the camera is used with other lenses.&lt;br /&gt;
&lt;br /&gt;
Affected Products&lt;br /&gt;
&lt;br /&gt;
EF200mm f/2L IS USM Lens&lt;br /&gt;
EF800mm f/5.6L IS USM Lens&lt;br /&gt;
&lt;br /&gt;
*This phenomenon does not occur with cameras other than the EOS 5D Mark III.&lt;br /&gt;
&lt;br /&gt;
*If the fifth and sixth digit of the six-digit alphanumeric number that is imprinted on the lens mount of the above EF lenses is of any of the following numbers, the lens is affected.&lt;br /&gt;
&lt;br /&gt;
EF200mm f/2L IS USM: If the fifth and sixth digit is 00, 01, or 02.&lt;br /&gt;
EF800mm f/5.6L IS USM:If the fifth and sixth digit is 00, 01, 02, 03, 04, 05, or 06.&lt;br /&gt;
&lt;br /&gt;
How to Identify Affected Products:&lt;br /&gt;
&lt;br /&gt;
Please check the six-digit alphanumeric number as indicated in the image below.&lt;br /&gt;
&lt;br /&gt;
Canon EF 200mm f/2 L IS and EF 800mm f/5.6 L IS Service Notice&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
Support&lt;br /&gt;
&lt;br /&gt;
The Canon Lenses affected by this phenomenon will be inspected and repaired free of charge starting from May 21, 2012. If you own one of the affected lenses, please contact our Customer Support Center.&lt;br /&gt;
&lt;br /&gt;
This information is for residents of the United States and Puerto Rico only. If you do not reside in the USA or Puerto Rico, please contact the Canon Customer Support Center in your region.&lt;br /&gt;
&lt;br /&gt;
Thank you,&lt;br /&gt;
Customer Support Operations&lt;br /&gt;
Canon U.S.A., Inc&lt;br /&gt;
&lt;br /&gt;
Contact Information for Inquiries&lt;br /&gt;
Canon Customer Support Center&lt;br /&gt;
Phone: 1-800-OK-CANON, 1-800-652-2666&lt;br /&gt;
TDD: 1-866-251-3752&lt;br /&gt;
Email: carecenter@cits.canon.com&lt;br /&gt;
For additional support options: &lt;a href=&quot;http://www.usa.canon.com/support&quot; rel=&quot;nofollow&quot;&gt;www.usa.canon.com/support&lt;/a&gt;&lt;/p&gt;</description>
			<pubDate>Tue, 15 May 2012 02:56:53 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/alabang/">nobody@flickr.com (alabang)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/grouptopic/72157629737725898</guid>
                        		</item>
		<item>
			<title>EF800 + Drop-In Circular Polarizer Filter (PL-C 52)</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157629393271386/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/jeanrouck/&quot;&gt;Panurus biarmicus&lt;/a&gt; posted a new topic:&lt;/p&gt;

&lt;p&gt;Canon 52mm Drop-In Circular Polarizer Filter (PL-C 52)&lt;br /&gt;
(2579A001)&lt;br /&gt;
&lt;br /&gt;
&lt;div&gt;&lt;span class=&quot;photo_container pc_m bbml_img&quot;&gt;&lt;a data-track=&quot;thumb&quot; href=&quot;/photos/jeanrouck/6899401392/&quot; title=&quot;cou noir with Canon 52mm Drop-In Circular Polarizer Filter (PL-C 52) by Panurus biarmicus&quot;&gt;&lt;img class='notsowide' src=&quot;http://farm8.staticflickr.com/7233/6899401392_8253c893bb_m.jpg&quot; width=&quot;240&quot; height=&quot;160&quot; alt=&quot;cou noir with Canon 52mm Drop-In Circular Polarizer Filter (PL-C 52) by Panurus biarmicus&quot;  class=&quot;pc_img&quot; border=&quot;0&quot; /&gt;&lt;/a&gt;&lt;/span&gt;&lt;/div&gt;&lt;/p&gt;</description>
			<pubDate>Fri, 06 Apr 2012 21:37:35 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/jeanrouck/">nobody@flickr.com (Panurus biarmicus)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/grouptopic/72157629393271386</guid>
                        		</item>
		<item>
			<title>5DIII + EF800mm : stabilisation ISSUE</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157629722263659/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/jeanrouck/&quot;&gt;Panurus biarmicus&lt;/a&gt; posted a new topic:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/groups/canon-eos-5d-markiii/discuss/72157629722249711/&quot;&gt;www.flickr.com/groups/canon-eos-5d-markiii/discuss/721576...&lt;/a&gt;&lt;br /&gt;
&lt;br /&gt;
Sunday I try the config 5DIII + EF800mmf/5.6LISUSM.&lt;br /&gt;
In one shot mode, I found the picture are not very sharp.&lt;br /&gt;
So, I try the AI servo mode and a strange sound appears.&lt;br /&gt;
I see quick move in the viewfinder.&lt;br /&gt;
&lt;br /&gt;
I switch off the stabilisation and the vibrations stops.&lt;br /&gt;
&lt;br /&gt;
Today I had found this :&lt;br /&gt;
&lt;br /&gt;
&lt;a href=&quot;http://www.canonrumors.com/forum/index.php/topic,5044.0.html&quot; rel=&quot;nofollow&quot;&gt;www.canonrumors.com/forum/index.php/topic,5044.0.html&lt;/a&gt;&lt;br /&gt;
&lt;br /&gt;
I hope this help.&lt;/p&gt;</description>
			<pubDate>Mon, 02 Apr 2012 02:34:32 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/jeanrouck/">nobody@flickr.com (Panurus biarmicus)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/grouptopic/72157629722263659</guid>
                        		</item>
		<item>
			<title>Reply to EF800 + extender 1.4x III</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157626264632272/72157628046302992/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/jjjfisherman/&quot;&gt;JFisherman&lt;/a&gt; posted a reply:&lt;/p&gt;

&lt;p&gt;Yep, I have one. But like the lens solo much better. AF is tricky. IQ is still very good though.&lt;/p&gt;</description>
			<pubDate>Thu, 03 Nov 2011 14:08:24 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/jjjfisherman/">nobody@flickr.com (JFisherman)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/groupcomment/72157628046302992</guid>
                        		</item>
		<item>
			<title>Reply to canon 800mm price up.</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157626132524638/72157627271494904/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/alabang/&quot;&gt;alabang&lt;/a&gt; posted a reply:&lt;/p&gt;

&lt;p&gt;Now it's $13,999.00&lt;/p&gt;</description>
			<pubDate>Sun, 24 Jul 2011 13:37:43 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/alabang/">nobody@flickr.com (alabang)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/groupcomment/72157627271494904</guid>
                        		</item>
		<item>
			<title>Reply to EF800 + extender 1.4x III</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157626264632272/72157627147161019/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/alabang/&quot;&gt;alabang&lt;/a&gt; posted a reply:&lt;/p&gt;

&lt;p&gt;Thanks. Will try to source one asap.&lt;/p&gt;</description>
			<pubDate>Sun, 24 Jul 2011 13:37:29 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/alabang/">nobody@flickr.com (alabang)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/groupcomment/72157627147161019</guid>
                        		</item>
		<item>
			<title>Reply to EF800 + extender 1.4x III</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157626264632272/72157626264640456/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/jeanrouck/&quot;&gt;Panurus biarmicus&lt;/a&gt; posted a reply:&lt;/p&gt;

&lt;p&gt;&lt;div&gt;&lt;span class=&quot;photo_container pc_m bbml_img&quot;&gt;&lt;a data-track=&quot;thumb&quot; href=&quot;/photos/jeanrouck/5526654704/&quot; title=&quot;Canard Siffleur EF800 + Extender 1.4x III by Panurus biarmicus&quot;&gt;&lt;img class='notsowide' src=&quot;http://farm6.staticflickr.com/5217/5526654704_a8b425a7fc_m.jpg&quot; width=&quot;240&quot; height=&quot;160&quot; alt=&quot;Canard Siffleur EF800 + Extender 1.4x III by Panurus biarmicus&quot;  class=&quot;pc_img&quot; border=&quot;0&quot; /&gt;&lt;/a&gt;&lt;/span&gt;&lt;/div&gt;&lt;/p&gt;</description>
			<pubDate>Mon, 14 Mar 2011 09:09:04 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/jeanrouck/">nobody@flickr.com (Panurus biarmicus)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/groupcomment/72157626264640456</guid>
                        		</item>
		<item>
			<title>EF800 + extender 1.4x III</title>
			<link>http://www.flickr.com/groups/ef_800mm_f56l_is_usm/discuss/72157626264632272/</link>
			<description>&lt;p&gt;&lt;a href=&quot;http://www.flickr.com/people/jeanrouck/&quot;&gt;Panurus biarmicus&lt;/a&gt; posted a new topic:&lt;/p&gt;

&lt;p&gt;It's better than the extender 1.4x II.&lt;/p&gt;</description>
			<pubDate>Mon, 14 Mar 2011 09:07:54 -0700</pubDate>
						<author flickr:profile="http://www.flickr.com/people/jeanrouck/">nobody@flickr.com (Panurus biarmicus)</author>
			<guid isPermaLink="false">tag:flickr.com,2004:/grouptopic/72157626264632272</guid>
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