https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/quot-AF-Working-Range-quot-amp-quot-Metering-Range-quot-question/m-p/3097#M551 <P>I am confused by two technical terms in the camera specs, can anyone please explain the meaning and real life impact to me <span class="lia-unicode-emoji" title=":face_with_open_mouth:">😮</span> ?<BR /><BR />1. According to the specs, the 6d has an expanded <STRONG>"AF Working Range"</STRONG>:<EM> "Center AF Point: EV -3 to 18 (at 73°F/23°C, ISO 100)"</EM> - see <A target="_blank" href="http://www.usa.canon.com/cusa/consumer/products/cameras/slr_cameras/eos_6d...">http://www.usa.canon.com/cusa/consumer/products/cameras/slr_cameras/eos_6d...</A><BR /><BR /></P><UL><LI>Since afaik all metering is done though the lens, (how) does the max. open aperture of the lens influence this af working range?</LI><LI>Since the -2ev of the 5d3 is supposed to be nearly moonlight, does a -3ev rating make a difference for real life shots like darker wedding receptions or shots in dim-lit clubs?</LI></UL><P><BR />2. The <STRONG>"Metering Range"</STRONG> for the 6d (and 60d btw) is <EM>"EV 0-20 (at 73°F/23°C with EF 50mm f/1.4 lens, ISO 100)"</EM>, for the 5d3 <EM>"EV 1-20 (at 73°F / 23°C with 50mm f/1.4 lens at ISO 100)"</EM> ....<BR /><BR /></P><UL><LI>Since a lens with a smaller max. open aperture will bump up the min. ev of the metering range, how does the difference between 5d3 (1-@f1.4) and 6d (0-@f1.4) matter for real life shots say with lenses of a max. open aperture with f2.8 or f4?</LI></UL><P>&nbsp;</P> Sat, 17 Nov 2012 17:01:17 GMT Marsu42 2012-11-17T17:01:17Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/quot-AF-Working-Range-quot-amp-quot-Metering-Range-quot-question/m-p/3097#M551 <P>I am confused by two technical terms in the camera specs, can anyone please explain the meaning and real life impact to me <span class="lia-unicode-emoji" title=":face_with_open_mouth:">😮</span> ?<BR /><BR />1. According to the specs, the 6d has an expanded <STRONG>"AF Working Range"</STRONG>:<EM> "Center AF Point: EV -3 to 18 (at 73°F/23°C, ISO 100)"</EM> - see <A target="_blank" href="http://www.usa.canon.com/cusa/consumer/products/cameras/slr_cameras/eos_6d...">http://www.usa.canon.com/cusa/consumer/products/cameras/slr_cameras/eos_6d...</A><BR /><BR /></P><UL><LI>Since afaik all metering is done though the lens, (how) does the max. open aperture of the lens influence this af working range?</LI><LI>Since the -2ev of the 5d3 is supposed to be nearly moonlight, does a -3ev rating make a difference for real life shots like darker wedding receptions or shots in dim-lit clubs?</LI></UL><P><BR />2. The <STRONG>"Metering Range"</STRONG> for the 6d (and 60d btw) is <EM>"EV 0-20 (at 73°F/23°C with EF 50mm f/1.4 lens, ISO 100)"</EM>, for the 5d3 <EM>"EV 1-20 (at 73°F / 23°C with 50mm f/1.4 lens at ISO 100)"</EM> ....<BR /><BR /></P><UL><LI>Since a lens with a smaller max. open aperture will bump up the min. ev of the metering range, how does the difference between 5d3 (1-@f1.4) and 6d (0-@f1.4) matter for real life shots say with lenses of a max. open aperture with f2.8 or f4?</LI></UL><P>&nbsp;</P> Sat, 17 Nov 2012 17:01:17 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/quot-AF-Working-Range-quot-amp-quot-Metering-Range-quot-question/m-p/3097#M551 Marsu42 2012-11-17T17:01:17Z