I am considering a 40 D and noticed a poll regarding the back focus issue; what happened to this poll and did the issue turn out to be just a rumor. Also can someone explain the issue of back focus to me?
Thanks
acutshall Member 119 posts Joined Aug 2007 Location: Oldsmar, Florida More info | Nov 05, 2007 10:35 | #1 I am considering a 40 D and noticed a poll regarding the back focus issue; what happened to this poll and did the issue turn out to be just a rumor. Also can someone explain the issue of back focus to me? D1 Mark III, 30D, 16-35mm f/2.8L II USM,15mm f/2.8 Fisheye,EF 70-200mm f/2.8L IS USM,EF 24-70mm f/2.8L USM, 4-580EXII
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gasrocks Cream of the Crop  13,432 posts Likes: 2 Joined Mar 2005 Location: Portage, Wisconsin USA More info | Nov 05, 2007 11:01 | #2 Any back focus problems are usually an error in the lens, not the body. GEAR LIST
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adas Goldmember  1,496 posts Likes: 5 Joined Aug 2004 More info | Nov 05, 2007 12:02 | #3 Both back- and front- focus issue is the error left behind by the manufacturer after aligning the AF sensor plane to match the exact same distance as the sensor plane from the lens. Although this adjustment wouldn't be hard to be properly made either by software or mechanically, it requires some extra time and several exposure checking. And we know that time = money. 6D, 20D, G7X
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So it sounds like it could be an issues with any camera/lenses; could anyone outline a series of steps to take to test your camera for its focusing accuracy. Also I have read about lenses being uncalibrated; I would like to check all my cameras/lenses, i have always had issues with clear focus. D1 Mark III, 30D, 16-35mm f/2.8L II USM,15mm f/2.8 Fisheye,EF 70-200mm f/2.8L IS USM,EF 24-70mm f/2.8L USM, 4-580EXII
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Hermeto Cream of the Crop  6,674 posts Likes: 2 Joined Oct 2005 Location: Toronto, Canada More info | Nov 05, 2007 12:25 | #5  Permanent banacutshall wrote in post #4257376  So it sounds like it could be an issues with any camera/lenses; could anyone outline a series of steps to take to test your camera for its focusing accuracy. Also I have read about lenses being uncalibrated; I would like to check all my cameras/lenses, i have always had issues with clear focus. Thanks What we see depends mainly on what we look for.
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gjl711 Wait.. you can't unkill your own kill.  57,738 posts Likes: 4072 Joined Aug 2006 Location: Deep in the heart of Texas More info | Nov 05, 2007 13:05 | #6 gasrocks wrote in post #4256904 Any back focus problems are usually an error in the lens, not the body. It’s the other way around. Front/back focus issues are due to body, not lens. A lens can be soft, but it will always be soft. Not sure why, but call me JJ.
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Thanks for the responses D1 Mark III, 30D, 16-35mm f/2.8L II USM,15mm f/2.8 Fisheye,EF 70-200mm f/2.8L IS USM,EF 24-70mm f/2.8L USM, 4-580EXII
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