Tue 06-Nov-12 10:35 AM | edited Tue 06-Nov-12 10:46 AM by richardd300
OK, so after another 180 shutter actuations I believe I have a much more credible result.
I created a dedicated bank and set the camera to Single point AF, JPEG Large, ISO400, illuminated with 200 watts of halogen lighting. Leveled the LensAlign and tripod, switched camera to Manual, MUP, Set distances just over recommended distances with a remote trigger. For 24mm took 40 shots from 0 to +20 and 0 to -20 all at 1/100 @f2.8. Loaded in to FocusTune overall result = +15.
Then exactly the same at 70mm to the set distance. Result = +10.
Then I repeated it at 45mm. Result = +5
Finally, conducted a further test at 45mm from +10 to +5 and +15. Result = +5
I perhaps will repeat the test at about 35mm. It all puts me in a bid of a dilemma really as this is my favourite lens and the results I have achieved on both my D700 and now D800 of landscapes and portraits have been in my view sharp at all focal lengths. However, the focus tests have now put doubts about its focus accuracy in my mind
The results pdf's are shown below.
Your help and advice on the results would be appreciated. I am minded at this stage to set a AF-fine tune at +10?