Image Adjustment - Nikon VBA23001 Repair Manual

INC
VBA23001-R.3762.A

Image adjustment

① Gr/Gb compensation adjustment (G filter)
Camera is faced to the light-emitting box (color viewer) of LV13 equiv. with SP2 (G filter) being put between
them. G-line crawl (3895×2610 pixels) is divided into (29×25) blocks, and the adjustment is made so that the
difference between Gr and Gb output can fall in the standard range.
Device
J63086
J61185
J63070
COLOR VIEWER
D1 STANDARD LENS
FILTER SP2
② Dark current adjustment
Take a picture of the blackout surface (against dark background) and adjust the variation of dark current on the
total screen.
When the adjustment is made, use eyepiece cap (or black cloth).
※
Device
EYEPIECE CAP
BODY CAP
③ Sensitivity adjustment
Under condition of ISO200 and ISO1600, the camera is faced to the color viewer (LV13 equiv.) with ND filter (-7
steps) being put between them. Using the tool lens (F5.6), the adjustment is made by changing the ampgain so
that G output can fall in the standard range. The gain value is adjusted so that the G output average value (Average
of Gr/Gb) of (425×425 pixels), which was deviated from the center by 425 pixels, can reach the target output
level. By this sensitivity adjustment, the gain difference adjustment among channels is automatically made.
Device
J63070
J61185
J18358
ND FILTER 4X 2 pieces
D1 STANDARD LENS
COLOR VIEWER
J18191
ND FILTER 8X
- A104 ･ D90 -