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All though I am posting this as a "how to" it is simply the process I have arrived at as of today. I would suggest this can be a starting point for anyone not familiar with Cornerfix. With some time this may evolve into a more refined process.
You must obviously download the Cornerfix program to attempt this. The link is above in the first post.
1. Set camera mode to A, focus your lens to infinity and stop down to whatever aperture you plan to use for making the profile (you may need to make a profile for various apertures if your lens shows significant difference between them).
2. Set exposure compensation to +2 EV. Focus to infinity.
3. You will need a piece of white tissue, or better yet, semi-opaque white plastic. Find a location with a clear view of the sky and aim in the direction of most even illumination. While holding the white tissue/plastic in front of the lens (but not touching) and snap a shot.
4. Import the photo to your editor.
5. Check for dust spots (max out the black level, contrast, and clarity to help spots more easily) and remove any that you find.
6. If you changed any image settings in the previous step, return them to their defaults, then white balance the image using the approximate center for the WB sample.
7. Export the file to DNG format. Rename it so you know which lens and aperture it corresponds with.
8. Open Cornerfix.
9. From the FILE menu, choose OPEN, and select the DNG file that you just created. Wait a few seconds while Cornerfix builds a thumbnail, then...
10. From the OPTIONS menu, choose PROFILE CREATION OPTIONS. Only the MULTIPLE EQUATIONS option should be ticked, click OK. This will cause profile creation to take longer, but should choose the best equation to generate your profile from. It will not affecting the time it takes to correct photos when the profile is later on.
11. From the LENS PROFILE menu, choose CREATE. Cornerfix will run for a minute or two. When the message in the bottom window reads "Processing complete" go to the next step.
12. From the LENS PROFILE menu, choose SAVE AS, and save the profile in a location you can easily find it again.
13. Return to the OPTIONS menu, choose PROFILE CREATE OPTIONS. This time MULTIPLE EQUATIONS and LUMINANCE COMPENSATION should be ticked, click OK.
14. Repeat steps 11 & 12, when saving the profile this time add something such as "lum-comp" to the file name.
15. You now have 2 profiles that can be used to correct images from your lens (whatever lens it might have been). They will give slightly different results so you may wish to try both to see which you prefer.
1. Before opening any images, there are a couple of options you may be interested in... from the OPTIONS menu, choose IMAGE CORRECTION OPTIONS. The CHROMA and LUMINANCE values can be fine tuned if need be. CHROMA deals with removal of color shift whereas LUMINANCE deals with removal of vignetting. If vignetting is not something you want to be corrected, set the value to 0.
2. Ok, the image must be a .dng file, if you have not converted to DNG format, do so now.
3. From the FILE menu, choose OPEN, and locate the .dng file that you created.
4. Cornerfix will open your image and create a preview.
5. From the PROFILES menu, choose OPEN and locate the profile that you want to use (see above section if you have not created a profile yet).
6. Cornerfix will begin the correction process. When correction is complete the preview will appear on the right side of the screen.
7. The preview quality is only so-so, but you should be able to get a rough idea how the color shift correction looks.
8. If you're not happy with the result try fine tuning the IMAGE CORRECTION OPTIONS, or use an alternate profile if you have one.
9. If everything looks fine, then rejoice in your corrected image, but make sure to save it before you quit! From the FILE menu, click SAVE IMAGE, then save it. All done!