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aFollow the steps below to adjust the relay back focus.
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1Release the hex screw k (1.5mm) by about a half a turn. Now the ring is free for adjustment:
2Leave the Iris on the relay lens fully open and adjust the back focus ring until you have achieved the sharpest image.
3Check that the film lens is at the best focus before you check the back focus a second time.
You will need a good quality monitor to accurately judge the sharpness.
4Once satisfied with the image, lock the hex screw to secure this adjustment and double check the image.
By using a Putora 7A9 chart you will be able to see the moiré effect of the test circles visible through the relatively low definition of the viewfinder.
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