wdwpsu Senior Member 625 posts Joined Aug 2007 More info | Nov 26, 2013 21:54 | #1 I'm not sure what I'm doing wrong. When I'm in AI Servo mode on the 5d3 in dark conditions, it hunts for and never gets focus. If I switch to One Shot, It'll quickly get focus every time. I do have the 600ex-rt on my camera to give me an AF Assist. Wedding and Event Photography ∙ Orlando, Florida ∙ DSWfoto.com
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DanMarchant Do people actually believe in the Title Fairy?  5,634 posts Gallery: 19 photos Likes: 2057 Joined Oct 2011 Location: Where I'm from is unimportant, it's where I'm going that counts. More info | Nov 26, 2013 22:06 | #2 When you say it never achieves focus do you mean that it remains clearly out of focus or do you mean that you can hear the AF working and so believe it hasn't achieved focus? If you take a shot is it actually OOF? Dan Marchant
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bobbyz Cream of the Crop 20,506 posts Likes: 3479 Joined Nov 2007 Location: Bay Area, CA More info | Nov 26, 2013 22:26 | #3 Take the flash off and see. Fuji XT-1, 18-55mm
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maverick75 Cream of the Crop More info | Nov 26, 2013 22:28 | #4 |
joeseph "smells like turd"  More info | Nov 27, 2013 01:49 | #5 I have a funny feeling that the AF assist light switches off when in AI Servo mode... some fairly old canon camera stuff, canon lenses, Manfrotto "thingy", and an M5, also an M6 that has had a 720nm filter bolted onto the sensor:
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Nov 27, 2013 01:51 | #6 joeseph wrote in post #16483130  I have a funny feeling that the AF assist light switches off when in AI Servo mode... It does.
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kin2son Goldmember 4,546 posts Likes: 3 Joined May 2011 Location: Sydney, Australia More info | Nov 27, 2013 02:21 | #7  Permanent banjoeseph wrote in post #16483130 I have a funny feeling that the AF assist light switches off when in AI Servo mode... AF assist light only works in one shot mode, always has been... 5D3 Gripped / 17-40L / Σ35 / 40 Pancake / Zeiss 50 MP / Σ85 / 100L Macro / 70-200 f2.8L II IS / 430 EX II / 580 EX II / Canon 2xIII TC / Kenko Ext. Tubes
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apersson850 Obviously it's a good thing  More info | So, at least for non-moving subjects, the solution is simple. Use One Shot AF. Anders
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amfoto1 Cream of the Crop 10,331 posts Likes: 146 Joined Aug 2007 Location: San Jose, California More info | Nov 27, 2013 10:05 | #9 The above responses are correct. AF Assist only works in One Shot. It can't help you in AI Servo. Alan Myers
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Nov 27, 2013 10:56 | #10 In Al Servo, there isnt a beep or flash in the view finder to indicate a locked focus. Maybe this is what you are experiencing. Al Servo is always moving . Name: Theron
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apersson850 Obviously it's a good thing More info | It does rapidly flash the circular green AF completed indicator when Servo AF doesn't find anything to track, though. Anders
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