Tripod use # 1
Posted: Tue 29 Jan, 2008 8:28 am
When I went to Lady Lake on Saturday, I found myself carrying my tripod before long.
Here's why.
I took this photo...
Didn't look too bad, until I zoomed in...
Here's a 100% crop of part of the photo.
What went wrong?
I was using f2.8 to achieve a narrow depth of field. I had the ISO bumped to 400 to get a bit more light in so the shutter would be fast enough.
Of habit, I press the shutter down half way to lock the focus, check the subject is composed the way I want, then take the photo by pressing the shutter all the way down.
Two things went wrong with this photo. There is motion blur - even though the shutter speed was 1/80 second (a minimum for 60mm zoom, but should be able to get away with it), there was enough motion to create blur;
The distance between the camera and the subject had changed between the time I locked the photo, and the time I pressed the shutter all the way in. Due to the narrow depth of field ( f2.8 ), this caused the subject to be slightly out of focus.
A faster shutter may have helped with the motion blur, but that would have required a higher ISO being that the lens is already wide open. A greater depth of field may have helped with the out-of focus, but that would have required a smaller aperture (f stop) which would have decreased shutter speed.
What did I do to fix it?
Get the tripod out and take it again...
Then find myself carrying the tripod for the rest of the day, in my normal fashion.
Note to self - don't be lazy...
Here's why.
I took this photo...
Didn't look too bad, until I zoomed in...
Here's a 100% crop of part of the photo.
What went wrong?
I was using f2.8 to achieve a narrow depth of field. I had the ISO bumped to 400 to get a bit more light in so the shutter would be fast enough.
Of habit, I press the shutter down half way to lock the focus, check the subject is composed the way I want, then take the photo by pressing the shutter all the way down.
Two things went wrong with this photo. There is motion blur - even though the shutter speed was 1/80 second (a minimum for 60mm zoom, but should be able to get away with it), there was enough motion to create blur;
The distance between the camera and the subject had changed between the time I locked the photo, and the time I pressed the shutter all the way in. Due to the narrow depth of field ( f2.8 ), this caused the subject to be slightly out of focus.
A faster shutter may have helped with the motion blur, but that would have required a higher ISO being that the lens is already wide open. A greater depth of field may have helped with the out-of focus, but that would have required a smaller aperture (f stop) which would have decreased shutter speed.
What did I do to fix it?
Get the tripod out and take it again...
Then find myself carrying the tripod for the rest of the day, in my normal fashion.
Note to self - don't be lazy...