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วันพฤหัสบดีที่ 12 สิงหาคม พ.ศ. 2553

Focus shift testing: Zeiss Planar 85mm f/1.4 ZE

Zeiss Planar 85mm f/1.4 ZE is an great lens but the only fault of this lens "the focus shift at close range" made me try these testing sequences.
Testing equipments: Canon 5D Mark II, tripod and test chart.

Sequence 1: test using AF assistant confirmation to ensured "In focusno af micro-adjustment and start lens on close distance then turn focusing ring to infinity direction until the AF assistant signal sound beef and green confirm dot appear. 
the sequence start from aperture f/1.4 to f/5.6 with one time focus at f/1.4 the rest remain same focus point (no re-focus).

















the exact focus point locate at 10mm in front of "focus here" the intend to focus..see big photo here..http://www.pbase.com/chounws3/image/127213786/original







































@f2.8 the sharpness focus move near to the intend focus point
























@f4.0 the sharpness focus move a bit behind the intend focus point






















@f5.6 the sharpness focus area move to around 10mm behind the intend focus point

Conclusion on Sequence 1, @wide aperture f1.4 the AF confirmation not exactly to the focusing point, but because of focus shift effect the exact focus sharpness area moving sequences when changing the aperture to f5.6.
But the sharpness still workable from f2.8 and smaller. The focusing confirmation at aperture f1.4 to f2.0 may be need compensated, wait for the next sequence.

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