She B |
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Shutter Priority
I am trying to figure out why I can get sharp images with shutter priority on my Canon 20D, but they are so dark.
I recently took some images of my son riding bulls inside of an indoor arena and this is what they look like sooc.
Diane
February 25, 2008
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John P. Sandstedt |
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Can't see the image[s] you've described. Nonetheless, if you set a fast shutter speed. by definition, the aperture will open. At wider openings, you lose depth of field, making sharp focusing critical. Did you shoot in the "one shot" or "continuous" firing mode. The latter would have allowed you a better chance at sharper focus since the lens adjust continuously. Because you shot in a "rodeo-type" setting, there probably was a good deal of dust. You could have increased your ISO setting to allow a smaller aperture and greater depth of field. With all the dust, the possibility of noise wouldn't have come into play.
February 25, 2008
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She B |
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Straight Out Of Camera
She B
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I shot continous...and this is the first time I've used shutter priority. Usually, he rides outdoors and I just boost my ISO and go on AV for that.
But this indoor that was giving me brighter images, but blurry. So I went TV with a 1600 iso and it was sharp, but very dark.
Diane
February 25, 2008
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David A. Bliss |
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I so rarely use the shutter priority that this is only going to be a guess. I am guessing that the shutter speed you chose required a bigger aperture than your lens had. What are the specs on your lens, and what is the EXIF for the image?
February 25, 2008
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She B |
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It's a sigma 70-200 2.8. Lovely lenes considering it's not a canon.
1/250
2.8
1600 ISO
Diane
February 25, 2008
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David A. Bliss |
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Well, I was making the assumption you would come back with 5.6... So much for assumptions! ;-) Maybe somebody else will have a more definitive answer, but I still think that was the problem. The shutter speed was too fast for the aperture, which caused the picture to be dark. Obviously, once the aperture all the way open, it can't go any further. Do you remember seeing any red warnings in the viewfinder? I don't have my camera in front of me, but I seem to recall my 10D will flash a small warning in the viewfinder when the settings are too dark in a priority mode. You might see if you can recreate the circumstance. Go inside somewhere without direct light, put the camera on shutter priority, and step up the shutter speed until the aperture is 2.8, and then go a little faster with the shutter speed and see what happens.
February 25, 2008
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She B |
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Oh goodness...how do I step up the shutter speed until the aperture is 2.8? There is so much to these cameras and lenses! Just when I feel comfortable, I fall behind!
Diane
February 25, 2008
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David A. Bliss |
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Set the camera to shutter priority. Set the shutter speed to something ridiculously low, like 2 secs. When you are looking through the viewfinder, you can see the shutter speed and the fstop (aperture setting). If, when the shutter speed is at 2 secs, the aperture is already to 2.8 then it is just way too dark to do this and you will need to find somewhere with more light, while still not being in direct light. Ok, so you are looking through your viewfinder, and the shutter speed is 2 secs and your aperture is not at 2.8 (maybe it is a 8 or 6.3, but something higher than 2.8). Next, raise the shutter speed, and watch the aperture. As the shutter speed goes up, the aperture number should drop. Once you get to the point where the aperture is at 2.8 then you are at the point where the camera thinks the scene is in proper exposure. Now raise the shutter speed more, you will see that the aperture stays at 2.8, since it can't go any lower. This will cause your picture to be underexposed. The faster you set the shutter speed, the more underexposed the picture will be, once you have hit the 2.8 aperture. Did any of this make sense? ;-)
February 25, 2008
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She B |
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I'll try it! I have a feeling that getting this will help me a lot!
Diane
February 25, 2008
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Amanda M. Freese |
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Hi She B. don't be scared of the TV mode setting .. .it's actually quite handy. . just remember that the faster your shutter speed is the darker the image will be- unless you go to the manual mode and manually set your AV to the widest possible opening. Manual isn't scary either - it just gives you control in certain low light situations to do just that.. depending on the indoor situation it still may or may not be possible without flash.
Also remember that the higher your ISO setting the more noise you'll get in the image. That can sometimes be undesireable. I would suggest (and others may have a better suggestion) for the indoor rodeo setting - using the manual mode and going up to the highest shutter speed you can (to catch the action) without poseing the danger of darkness and then setting your AV (aperture) to the widest (lowest number) setting you can or that the camera allows, and going up to maybe 400 in ISO. that will give you the best possible advantage for allowing light into your camera. Like John said above- you do lose depth of field with your wider AV settings but that may or may not be too critical for you if all other areas are on point. Do you use your Focus points? And what do you have as your focus type? AI Servo, or AI Focus?
Hope this was helpful
February 27, 2008
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