12-18-2014, 02:28 AM
Klaus,
I just got this lens and I really like it...works really well so far for me. Only problem I see that is bothersome is that at close focusing distances (<2ft) at 70mm the resolution is VERY poor. You showed this basic effect in your image where you showed your copy's focus shift issue. However, I am wondering more about this softness at close focus distances. On my lens, if I change it to the start of macro mode, I can focus still out towards infinity, but the close focus issue is fixed when I do this and take the picture from the exact same distance. It goes from being very soft to sharp! This effect goes away with subjects about three feet away. Did both your copies do this? Can you explain this behavior?
I just got this lens and I really like it...works really well so far for me. Only problem I see that is bothersome is that at close focusing distances (<2ft) at 70mm the resolution is VERY poor. You showed this basic effect in your image where you showed your copy's focus shift issue. However, I am wondering more about this softness at close focus distances. On my lens, if I change it to the start of macro mode, I can focus still out towards infinity, but the close focus issue is fixed when I do this and take the picture from the exact same distance. It goes from being very soft to sharp! This effect goes away with subjects about three feet away. Did both your copies do this? Can you explain this behavior?