i was wondering why my images i've taken so far appeared unaceptably soft at f4. so i carried out a proper testing with tripod, set up shutter release using timer, etc. following the guide here. http://www.youtube.com/watch?annotation_id=annotation_909500&v=xXgtdz5EZ5I&feature=iv
the test images i took are soft all the way until f7.1. At f7.1, it appeared to be the sharpest and remain about the same sharpness til f10.
Auto focus
70mm, at f2.8. 100% crop, focus at center.
70mm, at f4
70mm, at f7.1
i heard calibration can only fix front and back focus error, not sure if mine can be fixed. i'm really worry...a 2.5k lens at f4 is blurred whereas my 70-300 vr lens is almost razor sharp even at its widest aperture.
what if this issue can't be fixed at NSC?
the test images i took are soft all the way until f7.1. At f7.1, it appeared to be the sharpest and remain about the same sharpness til f10.
Auto focus
70mm, at f2.8. 100% crop, focus at center.
70mm, at f4
70mm, at f7.1
i heard calibration can only fix front and back focus error, not sure if mine can be fixed. i'm really worry...a 2.5k lens at f4 is blurred whereas my 70-300 vr lens is almost razor sharp even at its widest aperture.
what if this issue can't be fixed at NSC?
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