All,
I am hoping to achieve a conclusive understanding of focus shift. I have never experienced the problem firsthand, but see that the topic comes up fairly common in posts (e.g., regarding the Lux 35mm). I always thought it mean that, when focusing a lens at a certain f-stop (e.g., 4), the focus would be off, being either front or back focused. But, when recently reading an explanation on digilloyd, I think I was wrong. It seems that focus shift "is*a displacement of the sharp plane of focus when the lens is focused wide open, but the image is made with the lens stopped down." Such a problem is significantly better than what I had thought, as you can compensate for it simply by focusing/refocusing at the aperature at which you plan to shoot. Is that correct? Thus, if I had a Lux 35mm*with focus shift, I could focus and shoot at**f/1.4, focus and shoot at f/2, focus at f/2.8 to shoot at f/2.8, etc.
Thanks,
R
I am hoping to achieve a conclusive understanding of focus shift. I have never experienced the problem firsthand, but see that the topic comes up fairly common in posts (e.g., regarding the Lux 35mm). I always thought it mean that, when focusing a lens at a certain f-stop (e.g., 4), the focus would be off, being either front or back focused. But, when recently reading an explanation on digilloyd, I think I was wrong. It seems that focus shift "is*a displacement of the sharp plane of focus when the lens is focused wide open, but the image is made with the lens stopped down." Such a problem is significantly better than what I had thought, as you can compensate for it simply by focusing/refocusing at the aperature at which you plan to shoot. Is that correct? Thus, if I had a Lux 35mm*with focus shift, I could focus and shoot at**f/1.4, focus and shoot at f/2, focus at f/2.8 to shoot at f/2.8, etc.
Thanks,
R