Thursday, July 4, 2013

NIKON AF DC-NIKKOR 135mm 1:2D

Sharpness & DOF

F/2; DC/0:  DOF/2cm

F/2.8; DC/0: DOF/4cm

F/4; DC/0: DOF8cm

F/5.6; DC/0: DOF/10cm

F/8; DC/0: DOF/12cm
F/2

DC/R2

DC/R2.8

DC/R4
F/2.8

DC/R2

DC/R2.8

DCR4

F/4
DC/R2

DC/R2.8

DC/R4

DC/R5.6
Conclusion:

The best sharpness is really started from F/4.
In the sense of DC-Nikkor lens, BOKEH of a image does not equal to out-of-focus.

At F/2, DC/2; F/2.8, DC/2.8; F/4, DC/4, the lens adds a very slight BOKEH to the overall image.  It is a nice setting for portrait.

At F/2, as DC setting increase the overall BOKEH also increase.  It is really used for special effects.

At F/2.8, DC/2 moves the BOKEH forward; DC/4 moves the BOKEH backward, DC/5.6 further backward.

At F/4, DC/5.6 moves the BOKEH backward.

Thus, the best aperture to use is F/4 at DC/0 for sharpness; F4 at DC/4 adds some soft effect to the image; F/4 at DC/5.6 increases the background BOKEH.

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