08-23-2014, 07:58 PM
The author of Sigma AF 70-200mm f/2.8 EX OS HSM test is writing about focus shift at 200mm: "At the long end of the zoom range, the lens shows a small amount of focus shift when stopping down (residual spherical aberration)."
Sigma link: http://www.opticallimits.com/nikon--nikk...os?start=1
What about Nikkor AF-S 70-200mm f/4 here: http://www.opticallimits.com/nikon--nikk...dx?start=1 ?
If I understand correctly focus point is always at the line where is number 100 (and 15)?
- at f4 (200mm) you see number 100 is in focus
- at f5.6 (200mm) you see 100 is not totaly in focus, dof is going towards 90
- at f8 (200mm) you see 100 is not totaly in focus, dof is going towards 90
- at f11 (200mm) you see 100 is not totaly in focus, dof is going towards 90
So I can't have subject in focus at 200mm and f5.6, f8, f11. Is that normal?
Nikkor AF-S 70-200mm f/2.8 G ED VR II does not have this problem. Number 100 is always in focus:
http://www.opticallimits.com/nikon_ff/51...ff?start=1
Sigma link: http://www.opticallimits.com/nikon--nikk...os?start=1
What about Nikkor AF-S 70-200mm f/4 here: http://www.opticallimits.com/nikon--nikk...dx?start=1 ?
If I understand correctly focus point is always at the line where is number 100 (and 15)?
- at f4 (200mm) you see number 100 is in focus
- at f5.6 (200mm) you see 100 is not totaly in focus, dof is going towards 90
- at f8 (200mm) you see 100 is not totaly in focus, dof is going towards 90
- at f11 (200mm) you see 100 is not totaly in focus, dof is going towards 90
So I can't have subject in focus at 200mm and f5.6, f8, f11. Is that normal?
Nikkor AF-S 70-200mm f/2.8 G ED VR II does not have this problem. Number 100 is always in focus:
http://www.opticallimits.com/nikon_ff/51...ff?start=1