Quote Originally Posted by TAYLORW619 View Post
Hi Etherial,

I also have the 70-200 f/2.8 MK1 and I am interested in doing this 45 degree test. I understand everything that has been said for directions except consistency through all zoom ranges. How do I test consistency for all zoom ranges?

I am interested to see the results!

Thanks,
Taylor
Hi Taylor, you can just do the tests at a few points through the range. I did three points, 70mm, 130mm and 200mm. I found that after my lens came back from canon I got the same result at each focal length. If they are slightly different you can bias your adjustment based on what focal length you use most. Or send you lens away for calibration.