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3.4 SETTINGBACKFOCUS
Zoom lenses
:
1. Set up a chart or flat test subject at around 4 – 6 feet from the focal
plane.
2. Open the iris to the MAXIMUM aperture (T1.8, etc.). Use the in-
camera ND filters if necessary.
3. Set the zoom to the longest focal length (zoom in) and front focus
the lens for the sharpest image. At this point you will find it helpful
to adjust the camera viewfinder peaking control to a minimal amount
of peaking. This will show very fine focus changes. It is sometimes
helpful to turn off or lower the brightness on the viewfinder to
emphasize contrast. Practice by observing the peaking while racking
the follow focus slowly to find the sharpest point (peaking just on).
4. Now, set the lens to the WIDEST focal length (zoom out).
5. Unlock the back focus lock. This is the ring located in front of the
back focus adjustment ring.
6. Move the adjusting ring slowly while observing the viewfinder
peaking, or the waveform monitor, or the picture monitor (24”
preferably) for the best focus. Look at the finest detail that you can
discern.
7. Again, set the lens to the maximum focal length (zoom in) and front
focus for the sharpest image.
8. Zoom wide. If image is not sharp at the wide end, repeat step 4
above and adjust back focus (per step 6).
9. Lock back focus ring, making sure not to move back focus
adjustment.
10. Double-check the lens after securing the lock. You should be able to
zoom in, front focus and then zoom wide and maintain focus
throughout the focal range.
11. Confirm the distance scale on the front focus ring by placing the chart
at measured distances and checking the engraved scale.
Fixed focal length lenses:
1. Set the chart and the lens at a precisely measured close distance
that coincides with an engraved mark on the focus scale. This mark
should be no closer than the minimum focus plus 6" and no further
than the ability to resolve fine detail on the chart.
2. Follow steps 2, 5, 6, and 9 above. Note: on wide angle lenses it may
be difficult to confirm the distance scale by eye due to the extreme
depth of field of a wide angle lens.
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Содержание HD900F
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