glenerrolrd
Workshop Member
Great tests ..but they don t support the premise that focus shift isn t relevant. If you look at the example shot at F4 ..you can easily see that plane of focus lays around the +10 . If the D800 was adjusted for this setting the lens align target would be sharper ....so you are giving up some of the resolution possible with the lens due to focus shift .
On a flat surface (as the lens align target shows ) this would certainly be relevant . On a 3 dimensional surface it may not .....as the DOF shows acceptable sharpness over a range that covers the target .
I have several lenses that exhibit this type of focus shift and you can adjust your shooting in most cases to work around it . But its easier if you optimize the focus point around F2 and accept that at F1.4 you would be slightly front focused ...or just keep in mind that at f2.8 and f4 you might be a little back ..
On a flat surface (as the lens align target shows ) this would certainly be relevant . On a 3 dimensional surface it may not .....as the DOF shows acceptable sharpness over a range that covers the target .
I have several lenses that exhibit this type of focus shift and you can adjust your shooting in most cases to work around it . But its easier if you optimize the focus point around F2 and accept that at F1.4 you would be slightly front focused ...or just keep in mind that at f2.8 and f4 you might be a little back ..