Adjustment, Adjust the flange back of the lens as follows: 5k – Canon YJ12X6.5B IRS-A User Manual

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§4. ADJUSTMENT

4-1. FLANGE BACK ADJUSTMENT OF THE LENS

Adjust the flange back of the lens as follows:

5K

(NOTE):

Refer to the section 5. OPERATION as for details on zooming, focusing,

and iris operation performed with the flange back adjustment.

1. Select an object at an appropriate distance (2 to 3

meters recommended). A Siemens star chart is

perfect for this adjustment.

If no such chart is available, use any object that of

fers sharp contrast to facilitate the adjustment work.

A Siemens star chart is a kind of pie chart consisting

of “slices” which narrow down toward the center,

as shown in the figure on the right, and used to

facilitate focusing.

Siemens star

chart

2. Open the iris of the lens fully.

3. Set the lens to the telephoto end

by turning the zoom ring.

48

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