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<blockquote data-quote="hark" data-source="post: 245779" data-attributes="member: 13196"><p>I don't own these but did an online search--and came up with conflicting answers (bold font is my emphasis). Adorama states AF won't work with Nikon's AF-s lenses: </p><p></p><p><strong><u>From Adorama</u></strong>: <a href="http://www.adorama.com/KNAETSDNKAF.html" target="_blank">Kenko AEXTUBEDGN DG Auto Extension Tube Set Nikon AEXTUBEDGN</a></p><p></p><p><span style="color: #666666"><span style="font-family: 'arial'">Kenko's Auto Focus extension tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Nikon lenses given there is enough light to activate the cameras AF system properly. </span></span></p><p></p><p><span style="color: #666666"><span style="font-family: 'arial'">Please Note; </span></span></p><p><span style="color: #666666"><span style="font-family: 'arial'">1. <strong>When using extension tubes the lens will not focus to infinity. The focus range will be greatly limited to a very close focusing distance.</strong> </span></span></p><p><span style="color: #666666"><span style="font-family: 'arial'">2. There is light fall off when using any extension tube, sometimes the equivalent of 3 f-stops of light is lost when using multiple extension tubes together. <strong>This light lost can affect the camera's ability to auto focus.</strong> Manual focusing is recommended should the lens begin to "hunt" (not lock onto the subject).</span></span></p><p><span style="color: #666666"><span style="font-family: 'arial'">3. Nikon "D" information is not transmitted because the lens is focusing closer than its programmed to focus. </span></span></p><p><span style="color: #666666"><span style="font-family: 'arial'">4. <strong>Kenko Auto Extension Tubes are not auto focus compatible with Nikon AF-s (Silent Wave) lenses, manual focusing is required with these lenses</strong>. </span></span></p><p></p><p></p><p><strong><u>From B&H</u></strong>: <a href="http://www.bhphotovideo.com/c/product/375238-REG/Kenko_AEXTUBEDGN_Auto_Extension_Tube_Set.html" target="_blank">Kenko Auto Extension Tube Set DG for Nikon Lens A-EXTUBEDG-N B&H</a></p><p></p><p>The Kenko Auto Extension Tube Set DG is compatible with Nikon DSLR cameras and F mount lenses and is optimized to work with Autofocus lenses.Kenko's <strong>Auto Focus extension tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Nikon lenses given there is enough light (at f/5.6 or brighter) to activate the cameras AF system properly.</strong></p></blockquote><p></p>
[QUOTE="hark, post: 245779, member: 13196"] I don't own these but did an online search--and came up with conflicting answers (bold font is my emphasis). Adorama states AF won't work with Nikon's AF-s lenses: [B][U]From Adorama[/U][/B]: [URL="http://www.adorama.com/KNAETSDNKAF.html"]Kenko AEXTUBEDGN DG Auto Extension Tube Set Nikon AEXTUBEDGN[/URL] [COLOR=#666666][FONT=arial]Kenko's Auto Focus extension tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Nikon lenses given there is enough light to activate the cameras AF system properly. [/FONT][/COLOR] [COLOR=#666666][FONT=arial]Please Note; [/FONT][/COLOR] [COLOR=#666666][FONT=arial]1. [B]When using extension tubes the lens will not focus to infinity. The focus range will be greatly limited to a very close focusing distance.[/B] [/FONT][/COLOR] [COLOR=#666666][FONT=arial]2. There is light fall off when using any extension tube, sometimes the equivalent of 3 f-stops of light is lost when using multiple extension tubes together. [B]This light lost can affect the camera's ability to auto focus.[/B] Manual focusing is recommended should the lens begin to "hunt" (not lock onto the subject).[/FONT][/COLOR] [COLOR=#666666][FONT=arial]3. Nikon "D" information is not transmitted because the lens is focusing closer than its programmed to focus. [/FONT][/COLOR] [COLOR=#666666][FONT=arial]4. [B]Kenko Auto Extension Tubes are not auto focus compatible with Nikon AF-s (Silent Wave) lenses, manual focusing is required with these lenses[/B]. [/FONT][/COLOR] [B][U]From B&H[/U][/B]: [URL="http://www.bhphotovideo.com/c/product/375238-REG/Kenko_AEXTUBEDGN_Auto_Extension_Tube_Set.html"]Kenko Auto Extension Tube Set DG for Nikon Lens A-EXTUBEDG-N B&H[/URL] The Kenko Auto Extension Tube Set DG is compatible with Nikon DSLR cameras and F mount lenses and is optimized to work with Autofocus lenses.Kenko's [B]Auto Focus extension tubes are designed with all the circuitry and mechanical coupling to maintain auto focus and TTL auto exposure with most Nikon lenses given there is enough light (at f/5.6 or brighter) to activate the cameras AF system properly.[/B] [/QUOTE]
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