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Old Jul 8, 2008, 1:28 PM   #1
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Hey Everyone!

After using a Fuji P&S for a few years, I finally got my first D-SLR a couple weeks ago in the form of an XSi. The camera has been great so far, but since 99% of the photos I take are of transportation, I've run into a problem. A lot of photos I've taken are soft/out of focus, especially when I'm at or around 55mm and/or when I'm somewhat far from the subject. Does anyone know how this can be resolved? I'm going on a once-in-a-lifetime trip in a few weeks, and I'd like to get as many good photos as possible. I'm guessing a lot of it could be my inexperience. If it matters, I've shot exclusively in the Tv (Time value) mode and an using the lense that came with the camera.

Thanks!
Mark
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Old Jul 8, 2008, 7:08 PM   #2
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Mark,

We could offer much better help if you would post a couple un-edited photos (just resize them). Seeing the issues you're describing in a photo could help us determine what's going wrong.
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Old Jul 8, 2008, 9:45 PM   #3
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Also, are you shooting with all points active or just center point. The AF system does not know what you are wanting in focus and chooses the closest thing within the points of focus.
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Old Jul 9, 2008, 4:33 PM   #4
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Here are a couple that are still soft when resized. The first is a terrible photo in every possible way anyway, so it's no loss but I thought it was interesting that the road and fence were in focus but everything else wasn't. The second is actually pretty good when sharpened and converted to B&W (unfortunately the sun hasn't cooperated with me lately).

http://www.trainweb.org/asni/P2.jpg
http://www.trainweb.org/asni/P3.jpg

Mark
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Old Jul 9, 2008, 4:40 PM   #5
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KALEL33 wrote:
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Also, are you shooting with all points active or just center point. The AF system does not know what you are wanting in focus and chooses the closest thing within the points of focus.
That could definately the problem. I only use the center point, usually.
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Old Jul 9, 2008, 8:25 PM   #6
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cr6707 wrote:
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Here are a couple that are still soft when resized. The first is a terrible photo in every possible way anyway, so it's no loss but I thought it was interesting that the road and fence were in focus but everything else wasn't. The second is actually pretty good when sharpened and converted to B&W (unfortunately the sun hasn't cooperated with me lately).

http://www.trainweb.org/asni/P2.jpg
http://www.trainweb.org/asni/P3.jpg

Mark
are these photos cropped at all? They look VERY much front-focused - by quite a bit. Unnaturally so (i.e. things right at the front of the frame are in focus while subjects in the center of the frame are not).
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Old Jul 9, 2008, 9:33 PM   #7
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JohnG wrote:
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cr6707 wrote:
Quote:
Here are a couple that are still soft when resized. The first is a terrible photo in every possible way anyway, so it's no loss but I thought it was interesting that the road and fence were in focus but everything else wasn't. The second is actually pretty good when sharpened and converted to B&W (unfortunately the sun hasn't cooperated with me lately).

http://www.trainweb.org/asni/P2.jpg
http://www.trainweb.org/asni/P3.jpg

Mark
are these photos cropped at all? They look VERY much front-focused - by quite a bit. Unnaturally so (i.e. things right at the front of the frame are in focus while subjects in the center of the frame are not).
No, those are the originals.
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Old Oct 17, 2008, 11:19 AM   #8
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Any resolution on this? I have a similar issue, but it only occurs with my 50mm fixed lenses. I have an xsi and my 2 lenses are both Canon 50mm. One is the f1.4 and the other is f1.8.

Maybe it's these 2 lenses? My other 2 don't have this problem, even at full zoom and their fastest setting, which is f5 or so. I really like the wide aperture for flashless portraits of my son, so I'd like to get resolution on this. Maybe this should be in the lens forum? I'm not sure which is the better place. Here's an example:



I used single point metering which locked on his eye. Look at where it is most in focus. And this isn't a fluke. It's consistent. Is it the lens or the camera/lens combo?

a larger version is here:
http://www.flickr.com/photos/memento...06152/sizes/l/

original version here:
http://www.flickr.com/photos/memento...06152/sizes/o/

Any help or guidance would be appreciated. Thanks!
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Old Oct 18, 2008, 7:34 PM   #9
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The 50mm F1.8 uses a step focus motor and is not considered the best in accuracy. Also, since your other lens work fine, then it would most likely be that lens.
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Old Oct 18, 2008, 9:09 PM   #10
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thanks, but my other lenses only go to f5.4 at best and I like being able to take pictures without blinding my boy with the flash. They certainly have their place, but I would like to find out what's up with these 2 lenses. If I wasn't clear, both the f1.8 and f1.4 do the same thing, so I'm not so sure that it's about the lesser quality of the f1.8.
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