Swallen95 wrote:
So I said I would post some sports photos, here they are. I've got hundreds these are just a few. How do i avoid the blurr? I've pretty much just learned photography as I've gone- someone please help me understand fstop iso and shutter speed.
Photography is all about the light, without it you do not have a picture - basic. Shutter speed, fstop (aperture size), and ISO form a triangle which is the basis for the manipulation of light that enters your camera. If one value changes you will need to change one of the other values to compensate (if you are shooting manually - if you are shooting in shutter or aperture priority mode the camera will compensate for you). Danilo is right on the money when he states to obtain sharp images of action subjects, it's all about the shutter duration. But fstop and ISO are obviously a consideration too especially in low light conditions, the more light you have the faster you can set your shutter speed.
Generally speaking under good lighting conditions:
If the subject is coming towards you or moving away from you can set a shutter speed of 1/250 to freeze the action.
If the subject is moving from left to right, right to left, or up and down you should set a shutter speed of 1/500 to freeze the action.
If the action is a little more involved, a surfer for example you will need to set your shutter speed to 1/1000 or faster.
Now when it comes to depth of field (what is sharp in your picture and what is not) there are factors that must be taken into consideration including:
Distance between your camera and subject
Focal length of your lens
Aperture size
The smaller the fstop # (aperture size) - the shallower the depth of field (less of your picture that is in focus)
The bigger the fstop # (aperture size) - the deeper the depth of field (more of your picture that is in focus)
Now changing from one extreme to the other (ie f5.6 to f11) is a trade off. At the smaller fstop size you will isolate your subject from its surroundings but you risk more of the subject being out of focus. At the bigger fstop size more will be in focus however you risk distracting from your main subject. As Danilo says, you will need to experiment because there is no hard and fast formula and every situation is different.
If the lighting is such that you need to boost up your ISO which increases your camera sensor sensitivity to light then so be it. At extreme levels you will introduce "noise" into your picture (grain) but most modern DSLR's can handle ISO's quite happily up to 1600 and maybe beyond (some are better than others). Having said that if you are happy with your shutter speed and aperture size but do not want to increase your ISO TOO high you can leave your picture maybe at 1 stop underexposed and boost it back up in PP software.
I hope I am not teaching you to suck eggs here. If I have erred in my information or omitted any important details there are a lot of really experienced people on this site that will correct me.
The bottom line is take lots of pictures and experiment, learn from the pictures that you are not happy with and enjoy the ones that you are. Reflecting Danilos great advice to you once again, there is a lot to be said for intentional blurring and artistic flair. Cheers
Danilo wrote:
The quest for sharply detailed photos of action subjects is all about shutter-speed, or, more correctly shutter-duration. In the case of your photos of football players, often they are moving very fast, and, in fact, sometimes you are actually moving your camera as well. Generally you'll need a shutter-duration of at least 1/500th sec. or perhaps greater (1/1000th, 1/1200th, etc.). This is not too difficult on a bright, sunny afternoon: 1/1000th sec. @ f/5.6 is average with ISO 100. But when you get stuck under the lights for evening games it becomes a challenge. You need to be boosting your ISO up to, perhaps, 1000, or even 1600 or greater. It's something you'll need to experiment with, as there isn't any really reliable formula to follow.
On the plus side: Don't neglect intentional blurring as an expression of action in a photo. Race cars, for example, photographed with very speedy shutter-durations will often look like they are "parked" on the track, not giving the impression of speed at all.
You are venturing into an extremely interesting area of photography which I'm sure you will enjoy. Fortunately, with digital, we can take multitudes of images without having to mortgage the homestead. So, shoot LOTS and have FUN and success will be YOURS!
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