Diver-Down Senior Member 275 posts Likes: 2 Joined Mar 2008 Location: Bethlehem PA More info | May 09, 2010 15:50 | #1 I've been playing around with Spot AF and Single Point AF and really don't see a difference between the two. I tried focusing on a small branch in Single Point and moved closer until I was just able to obtain focus then switched to Spot AF but wasn't able to move any farther away.
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Alex_Venom Goldmember  1,624 posts Likes: 1 Joined Nov 2008 More info | May 09, 2010 16:05 | #2 Spot AF and Single Point AF only changes the size of the AF sensor, but not its precision nor anything else. Photography is about GEAR and not talent or practice. Practice won't make you a better photographer. Expensive equipment will. =D
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Diver-Down THREAD STARTER Senior Member 275 posts Likes: 2 Joined Mar 2008 Location: Bethlehem PA More info | Ok, So I just went outside and tried to focus on a tree trunk through a white metal fence with 1 1/2'" square holes. With the camera on a tripod I moved closer to the fence until I was just able to focus between the openings in Spot, then switched to Single Point and was still able to focus. Moved around a bit and went back and forth between modes and really didn't see a difference.
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Jim_T Goldmember  3,312 posts Likes: 115 Joined Nov 2003 Location: Woodlands, MB, Canada More info | May 09, 2010 19:49 | #4 The camera's AF area is larger than the little squares you see on the focus screen. When you choose spot focus, you're reducing the AF area. The focus area still extends past the area of the square, but not as much.
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ccp900 Goldmember 1,569 posts Likes: 144 Joined Jun 2006 More info | May 09, 2010 20:59 | #5 yeah, i had the same experience...i also posted a thread here which showed that the actual area of focusing is not aligned with the markers in the VF. Tested both my 7d's and it was the same.... [Sony A7R Mark 3 | Sony A7S | Sony Zeiss 16-35m f/4.0 | Sony FE 85m f1.8 | Sony FE 20m f1.8 G | Samyang 18m f2.8 | Samyang 45m f1.8 | Zeiss Batis 40m f2 | Sony FE 28m f2 | Sony Zeiss 55m f1.8 | Sony FE 28-70m f/3.5-5.6 | Helios 44-2 | Helios 44-3 | Nikon 105m f/2.5 AIS | Contax Zeiss Planar 50m f1.7 | Contax Zeiss Planar 100m f2 | Voigtlander Nokton 40m f/1.4 | Canon 24-105m f/4.0L | Canon 85m f/1.8 | Sigma 30m f/1.4 | Canon 10-22m f/3.5-4.5 | Canon 100m f/2.8 Macro USM | Canon 580 EX Ver 1.0]
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Diver-Down THREAD STARTER Senior Member 275 posts Likes: 2 Joined Mar 2008 Location: Bethlehem PA More info | That's a good idea, thank's. I'll do that test next chance I get.
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ccp900 Goldmember 1,569 posts Likes: 144 Joined Jun 2006 More info | May 10, 2010 00:46 | #7 saw something at dpreview that explains the af sensor layout.... [Sony A7R Mark 3 | Sony A7S | Sony Zeiss 16-35m f/4.0 | Sony FE 85m f1.8 | Sony FE 20m f1.8 G | Samyang 18m f2.8 | Samyang 45m f1.8 | Zeiss Batis 40m f2 | Sony FE 28m f2 | Sony Zeiss 55m f1.8 | Sony FE 28-70m f/3.5-5.6 | Helios 44-2 | Helios 44-3 | Nikon 105m f/2.5 AIS | Contax Zeiss Planar 50m f1.7 | Contax Zeiss Planar 100m f2 | Voigtlander Nokton 40m f/1.4 | Canon 24-105m f/4.0L | Canon 85m f/1.8 | Sigma 30m f/1.4 | Canon 10-22m f/3.5-4.5 | Canon 100m f/2.8 Macro USM | Canon 580 EX Ver 1.0]
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foghorn Senior Member  329 posts Joined Jul 2006 Location: Fullerton, CA More info | May 10, 2010 01:09 | #8 Jim_T wrote in post #10150945  The camera's AF area is larger than the little squares you see on the focus screen. When you choose spot focus, you're reducing the AF area. The focus area still extends past the area of the square, but not as much. For a good explanation check out the B&H video at the link below... Choose the one that says "EOS 7D, 1 of 3" and go to the 32 minute point.... (You'll probably want to watch them all). Each video is about 50 minutes. http://www.video.bhphotovideo.com …dbee4f4d48db9a26a992d3ab2 I was just going to refer the OP to this vid. Great minds think alike. Canon 7D & 40D | 17-55 2.8 IS | 28 1.8 | 85 1.8 | 50mm 1.8 | 70-200mm 2.8L IS | 580EX II, 430EX |
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apersson850 Obviously it's a good thing  More info | I've compared normal single point to spot AF and did find a difference. Anders
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wask_ Senior Member  297 posts Joined Mar 2010 More info | May 16, 2010 12:47 | #10 In wich situation do you guys use normal or spot af ? Im always using spot af and dont see any reason of using normal single point. - 7D -
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apersson850 Obviously it's a good thing More info | When it gets a bit darker, or if the subject is lacking well defined contrasts, or if it's moving fast, for example. The normal or expanded single point is better than spot. Anders
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