Editing is not going to save a bad shot, and those are poor but that's not to say you're not going to get any better. It's taken me almost 3 years of going to about 10 or so motorsport events a year and taking thousands of pictures before I've gotten to what I think is a decent standard.
First of all you want to make sure you are in AI Servo for Auto-focussing, I've not used the 5DIII and I know it's got a hugely complex AF system and I would suggest you take a look at the AF Guidebook as it'll help you - http://goo.gl/fEc1Hx.
It's really important to spend some time tweaking the AF as it makes a difference between getting a good hit rate or a load of duds. Normally I work in Zone AF mode and I will use the custom settings to make sure the camera obtains focus before releasing the shutter for the first shot (I think it's called Focus Priority), 'Responsive' set to +1 for switching between subjects quickly and acceleration/deceleration tracking set to +1. BUT experiment with what works for you.
For panning shots work in TV mode and let the camera work out the aperture needed; start off at 1/320 and work your way down (1/250, 1/125). Set the ISO manually though, 100/200 for good light 400/800 for grey-overcast/rain generally. For head on shots there's no point trying to get any motion blur using a low shutter speed because you'll just end up with blurry image so try and keep to the general rule of 1:1 for focal length/shutter speed (for example 1/320 for 300mm) or higher. There's a few good guides online about panning technique but a good start is to stand parallel to the track with your feet pointing towards to spot where you want to capture the car, pick the car up as it approaches and swing in an arc as the car passes and continue the swing after the car has passed as this will help keep the motion smooth. You'll probably find that the best shots are in the middle of the burst as this is where you were at your must natural position and not all twisted up hence me saying point your feet towards where you want your shot.
If you are shooting head on through a fence, make sure you are in A (aperture priority) set the aperture to the lens's widest (lowest number), zoom in as much as you can and get as close to the fence as (safely!) possible.
IMG_1448 by Bryan Janes, on Flickr
This was taken through a fence and you can just about see a slightly darker area in the top right hand corner but the shot is more than usable.
Panning shots through fences are often a waste of time however and rarely work so don't waste space on your memory card because they'll look not too bad on a 3" LCD but the second you put them up on a monitor they'll look awful.
In terms of editing, I don't find much need to heavily process shots, I just tweak the highlights/shadows and apply a bit of sharpening. I guess firstly you want to understand the histogram in LR as that will point out some of the highlight clipping you've got in one of your shots. I've rambled on enough but this will give you a decent explanation about how to understand a histogram - http://photography.tutsplus.com/tut...gram-in-adobe-photoshop-lightroom--photo-4278.
It'd still be useful to know what lens you took those shots with.
First of all you want to make sure you are in AI Servo for Auto-focussing, I've not used the 5DIII and I know it's got a hugely complex AF system and I would suggest you take a look at the AF Guidebook as it'll help you - http://goo.gl/fEc1Hx.
It's really important to spend some time tweaking the AF as it makes a difference between getting a good hit rate or a load of duds. Normally I work in Zone AF mode and I will use the custom settings to make sure the camera obtains focus before releasing the shutter for the first shot (I think it's called Focus Priority), 'Responsive' set to +1 for switching between subjects quickly and acceleration/deceleration tracking set to +1. BUT experiment with what works for you.
For panning shots work in TV mode and let the camera work out the aperture needed; start off at 1/320 and work your way down (1/250, 1/125). Set the ISO manually though, 100/200 for good light 400/800 for grey-overcast/rain generally. For head on shots there's no point trying to get any motion blur using a low shutter speed because you'll just end up with blurry image so try and keep to the general rule of 1:1 for focal length/shutter speed (for example 1/320 for 300mm) or higher. There's a few good guides online about panning technique but a good start is to stand parallel to the track with your feet pointing towards to spot where you want to capture the car, pick the car up as it approaches and swing in an arc as the car passes and continue the swing after the car has passed as this will help keep the motion smooth. You'll probably find that the best shots are in the middle of the burst as this is where you were at your must natural position and not all twisted up hence me saying point your feet towards where you want your shot.
If you are shooting head on through a fence, make sure you are in A (aperture priority) set the aperture to the lens's widest (lowest number), zoom in as much as you can and get as close to the fence as (safely!) possible.
IMG_1448 by Bryan Janes, on Flickr
This was taken through a fence and you can just about see a slightly darker area in the top right hand corner but the shot is more than usable.
Panning shots through fences are often a waste of time however and rarely work so don't waste space on your memory card because they'll look not too bad on a 3" LCD but the second you put them up on a monitor they'll look awful.
In terms of editing, I don't find much need to heavily process shots, I just tweak the highlights/shadows and apply a bit of sharpening. I guess firstly you want to understand the histogram in LR as that will point out some of the highlight clipping you've got in one of your shots. I've rambled on enough but this will give you a decent explanation about how to understand a histogram - http://photography.tutsplus.com/tut...gram-in-adobe-photoshop-lightroom--photo-4278.
It'd still be useful to know what lens you took those shots with.
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