Crayons15 Member 172 posts Likes: 3 Joined Feb 2008 Location: Nashville, TN More info | Jul 09, 2008 20:36 | #1 is the auto focus on everyone's 50mm 1.8 not sharp at all wide open? i took the same photo twice....both at 1.8 and the manual focus one is sharper. i don't remember my pics with this lens being this out of focus before (i've had it about 3-4 months)..have i done something to mess up my AF? or do a lot of people have this problem?
auto:
7D | Tokina 11-16mm 2.8 | Sigma 17-70mm 2.8-4 OS | 50mm 1.8 II | 70-200mm f/4L IS
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Jul 09, 2008 20:42 | #2 In MF you have sharp center and soft top petals. Ex-Canon shooter. Now Sony Nex.
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folville Goldmember  1,022 posts Likes: 2 Joined Dec 2006 Location: MN More info | Jul 09, 2008 20:42 | #3 The focus between those two photos has shifted. That's the real issue with the 50mm f1.8 in my opinion. It can be a fine lens when you achieve focus or can stop down a bit, but it's AF is pretty poor. Regardless, you get more than what you pay for with this little gem.
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Jul 09, 2008 20:49 | #4 ok my bad it did shift...whoops! i guess i just feel like the AF should be sharper because everyone always talks about it being a sharp lens. then again i can't complain much b/c of the price 7D | Tokina 11-16mm 2.8 | Sigma 17-70mm 2.8-4 OS | 50mm 1.8 II | 70-200mm f/4L IS
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folville Goldmember 1,022 posts Likes: 2 Joined Dec 2006 Location: MN More info | Jul 09, 2008 20:51 | #5 It's a fine tool, but I think it'd be a bit silly to suggest that it has great AF capabilities. I use the AF as often as I can get by with it, but I do find myself switching to MF in many tricky situations.
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Jimmer411 Thank god Im green. 866 posts Likes: 2 Joined Sep 2007 Location: Pacific, WA More info | Jul 09, 2008 20:52 | #6 Mines pretty sharp wide open, but likes to miss focus when theres action. 5D3 | Sigma 30mm f/1.4 HSM | EF 85mm f/1.8 USM | EF 24-70 f/2.8L II | EF 70-200 f/2.8L IS II | 430EX | YN-568EX II | YN-622c | YN-622-TX |
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Sorry if this is a little off topic, but I have problems with my AF on 50 1.8(my keeper rate is only 30-40% in low light) as well. Is the 50 1.4's AF much better? 5D III, R7
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tim Light Bringer  51,010 posts Likes: 375 Joined Nov 2004 Location: Wellington, New Zealand More info | Jul 09, 2008 21:46 | #8 The 50 1.8 autofocus is inaccurate, buy a better lens if you need better performance. The 50 1.4 is definitely better, it has a USM motor. Professional wedding photographer, solution architect and general technical guy with multiple Amazon Web Services certifications.
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emmerse Junior Member 24 posts Joined Jul 2008 More info | Jul 09, 2008 21:47 | #9 cancan7, my professional photographer friend told me that the 50 1.4 is much better, but the focusing speed is also dependant on your camera body. Also, i suggest you avoid 'focus and recompose' technique and see if it works. Correct me if i'm wrong. My Flickr - http://www.flickr.com/jacksen
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BLUEORIGINS Member  43 posts Joined Dec 2007 Location: Olympia WA More info | Jul 09, 2008 21:54 | #11 My 50mm 1.8 struggles with it's AF, so I tend to keep it in MF most of the time. Small price to pay for a good lens at a great price. Kristie
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folville Goldmember 1,022 posts Likes: 2 Joined Dec 2006 Location: MN More info | Jul 09, 2008 21:56 | #12 The Canon 50mm f/1.4 is a bit better, but it still doesn't have traditional the ring-type USM that it really needs to shine for auto focus. I haven't heard much about the Sigma 50mm f/1.4, but some have speculated that it will have fast, accurate AF, albeit at a higher price point.
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I've uploaded two pictures taken with the 50 1.8II, the first one was out of focus, while I got the second one correct. I know the pictures are too small, but I don't know how to upload bigger pics from Flickr:
here's the link to the exif data(sorry I don't know how to embed the exif onto the picture) http://www.flickr.com …1087@N03/2655035849/meta/  Exposure: 0.005 sec (1/200) Aperture: f/2.2 Focal Length: 50 mm ISO Speed: 800 Exposure Bias: -1/3 EV Flash: Flash fired, red-eye reduction Got it right the 2nd attempt
http://www.flickr.com …1087@N03/2655038673/meta/ Exposure: 0.005 sec (1/200) Aperture: f/2.2 Focal Length: 50 mm ISO Speed: 800 Exposure Bias: -1/3 EV Flash: Flash fired, red-eye reduction Any help is welcome  5D III, R7
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Jul 10, 2008 18:01 | #15 I've posted links to the flickr page now, thanks 5D III, R7
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