I sent of and got the Lensalign Pro last week. I set it up this weekend and began testing my back up camera (which I use as a walk around camera for work) and the 35mm F1.4L. I am using a 5D Mark II on this test.
I set it up at the minimum distance, ran a series of pictures and checked them on the computer. Very accurate results in the set. Then I tried the camera at various other distances. I found only slight variations in results in these three test which could be contributed to distance.
Then later I decided to check again, because I am somewhat of a perfectionist. Every time I have reset up in a different location I get slightly different results. Some may be contributed to lighting, maybe not because I have tried to eliminate this possibility.
My results have varied from Plus 3 with Plus 3 leaning toward the forward focus side and Plus 6 leaning toward the back focus side.
How I am taking the pictures is sets of 8 at each point, from 0 to 10. Renaming the files out of EXIF data and then reviewing full screen. Either at 100 or 200% depending. Each set has been very consistent and accurate in that you can easily establish the DOF that is being generated at each setting and see the gradual change from one point to the next.
The variation in results is from one set to the next.
I understand that the wider angle lens will not adjust as well as the telephoto's.
So I guess what I am trying to figure out is this normal for the 35mm lens? Is this just from the subtle change in lighting from one test set up to the next?
Or does the camera AF system float a little bit and this is the norm?
Or is the simple answer, I am to picky, set it at plus 5 it will back focus more than front focus and go test the next lens.