Upgrading from the Plus to Pro version is just the cost difference, so starting at Plus and later upgrading is the same as buying the Pro from the start.
Yes, the software guides your through the setup step by step. Also, detailed and (imho) excellent manuals are provided.
For the 7D, your print the target, put it on a wall, light it, put the 7D on a tripod connected to your PC and follow the Target Setup instructions and then run the fully automatic test. First lens may take you 10-15 minutes, from then on it's less than 5 minutes per lens/focal length/distance.
Ah ok, that sounds pretty good
So for the 5D3, it's a similar affair but i have to enter in the microadjustment settings myself after it calculates it, is that right?
Another question, for my zooms (24-70, 70-200) does it have to to adjust for a variety of focal lengths? What are the steps needed to do this?
Also, i only have access to a laser printer, would that be ok for printing the test sheet?
Cheers, much appreciated for the help!
For the 5D3, FoCal will ask you to set the microadjustment amount to the value it needs, for each step (usually, it goes <existing value>, -20, -10, 0, +10, +20, and then a 3/2/1-value stepping depending on the fit quality. Maybe 15 datapoints in total.
For the 7D, you can only enter a single AFMA value, which is used for all focal lengths. For the 1Dx and the 5D3, there are two values: Wide and Tele. I usually do four tests: max Wide/ and max Tele (e.g. 24mm and 70mm on my 24-70mm Mk I) and two distances (2m and 5m to target). It all depends on how much effort you want to put into the calibration.
I used a laser printer for the target as well (I don't have easy access to an inkjet) and while I can see that the glare/reflection causes some loss of accuracy, you should be OK.
I like the Pro features and since it was just £30 more than the Plus (£70 vs £40 for the Plus), I went for it. Again, you can start with the Plus for £40 and if you regret not getting the Pro then just pay the £30 to get the extra features.