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Old Dec 5, 2005, 12:18 AM   #1
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Hello, I am new to this forum.

I purchased a Canon digital EOS 20d camera 6 months agoand a Tamron 28 - 75mm, f2.8 lens to take portrait photoswith. Iwas new at thisso I took a portrait workshop to get me started. Prior to this I used a Kodak Easyshare which took great, but notoutstanding portraits. But I wanted outstanding.

Since that time 50% of my photos turn out very blurry and very few of the remainder are sharp. I thought it might be camera shake so I've used a tripod and set my speed at greater than 1/60 second. I thought it might be too large an aperature so I stopped it down to 5.6.I also make sure the automatic focus sensors are only on my subjects. I use the Av mode so I can adjust my f-stop.

I tried to include sample photo croppings of a couple pairs of photos taken one after another with the exact same settings. I can only seem to send one single photo. All my photos were taken outside at 1/80th second, f/5.6, ISO 200, with fill flash and a tripod. One will be blurry, the next sharp. I really hope someone has some suggestions.

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Old Dec 5, 2005, 12:22 AM   #2
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Here isthe samesection of the very next photo I took, and it turned out much sharper.

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Old Dec 5, 2005, 2:46 PM   #3
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Can you post the EXIF data for both photos please??
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Old Dec 5, 2005, 8:31 PM   #4
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I think this is the EXIF data, am I right?

Data for the bad photo

Image description
Artist
Copyright
Make Canon
Model Canon EOS 20D
X resolution 72
Y resolution 72
Datetime 2005:12:04 13:49:33
YCbCr positioning co-sited
Exposure time 1/200 s
F-number 5.6
Exposure program Aperture priority
ISO speed ratings 200
Date/time original 2005:12:04 13:49:33
Date/time digitized 2005:12:04 13:49:33
Component config YCbCr
Shutter speed value 0.005000 s
Aperture value 4.97086
Exposure bias value 0
Metering mode Pattern
Flash
Focal length 75 mm
User comment
Colorspace sRGB
Pixel X dimension 2336
Pixel Y dimension 3504
Focal plane X res. Unknown
Focal plane Y res. Unknown
Focal plane res. unit inch


Data for the Good Photo

Image description
Artist
Copyright
Make Canon
Model Canon EOS 20D
Orientation upper left
X resolution 500.25
Y resolution 500.25
Datetime 2005:12:04 17:28:01
YCbCr positioning centered
Exposure time 1/100 s
F-number 5.6
Exposure program Aperture priority
ISO speed ratings 200
Date/time original 2005:12:04 13:50:39
Date/time digitized 2005:12:04 13:50:39
Component config YCbCr
Shutter speed value 0.010000 s
Aperture value 4.97086
Exposure bias value 0
Metering mode Pattern
Flash
Focal length 75 mm
User comment
Colorspace sRGB
Pixel X dimension 2001
Pixel Y dimension 2804
Focal plane X res. Unknown
Focal plane Y res. Unknown
Focal plane res. unit inch

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Old Dec 5, 2005, 9:38 PM   #5
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Nothing really looks out of line on the exif data. The only thing in fact different is shutter speeds.

I did notice you used aperture priority on both, which is not necessarily a bad thing, just when using aperture priority the camera selects the shutter speed, and a faster shutter speed would definately correct your blur.

I don't even think the focal length should be a problem with that shutter speed. Sometimes when you are using a large (zoomed) focal length, the shutter speed really needs to be kicked way up, but that does not appear to be the problem either.

I am stumped at this stage to find anything wrong with the exposure settings and nothing sticks out that could create this problem. You would normally see a very low shutter speed that creates this type of blurring, or you just had a very shaky photo.

Is this a problem with just one lens??
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Old Dec 5, 2005, 10:03 PM   #6
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Was any part of the full photo in focus? If it was the camera was focused on the wrong part of the image when you triggered the shutter.

The shutter speed was 1/200 for the blurred photo, which should be OK even handheld with that lens. You said it was on a tripod so subject motion would be the only consideration, and it isn't an action shot. The shutter speed isn't a factor in the blurred shot IMO.

I don't have a 20d. If it has a flex focus system where you can move the focus point to different parts of the image turn the feature off and have it spot focus in the center. Pre focus on what you want sharp and lock the focus or switch to manual if manual holds the last focus point. Or just hold the shutter halfway if framing isn't going to alter the exposure.

The face in the blurred photo is not only blurred but also dark. If you are in spot metering the spot area wasn't on the face when you took the picture. It probably was on the sharp image, so the focus point could have been different between the two.

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Old Dec 5, 2005, 10:28 PM   #7
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My camera has 9 autofocus points in the full mode. When I first took some family portraits I used the Portrait Mode which used all autofocus points and an aperature of 2.8. Needless to say, most ofmy photos were blurry. However, one happened to turn out and that one was a hit. Here it is:
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Old Dec 5, 2005, 10:35 PM   #8
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However, here is a full, downsized version of that blurry photo I submitted earlier. If it was just this one photo I would blame it on camera shake or something. But it happens to over 50% of my photos. Of course, the blur isn't so obvious at a distance.
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Old Dec 5, 2005, 10:38 PM   #9
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Here is the better photo:


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Old Dec 5, 2005, 10:53 PM   #10
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Is this the only lens you have??

If not, what about other lens?


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