Cleaning The Ccd - Nikon D1 Manual

Cleaning the CCD

The charged-coupled device (CCD) that serves as the D1's picture element is
fitted with a low-pass filter to prevent moiré. While this filter prevents dirt from
getting onto the CCD, any dirt or dust that finds its way onto the filter may,
depending on shooting conditions, appear in photographs taken with the
camera. In this case you will need to clean the filter.
The low-pass filter is extremely delicate and is easily damaged. It is recom-
mended that you have it cleaned by Nikon-authorized service personnel.
How to tell when the filter needs cleaning (I)
1
Set the exposure mode to programmed auto (P) or aperture-priority auto
(A) and choose the smallest aperture setting (largest f-number).
2 Take a picture of an evenly-colored, white object, such as a clean, white-
colored wall. Load the photograph onto a computer and examine it on the
computer monitor. If the photograph contains dark specks or lines, you will
need to have the filter cleaned at a Nikon-authorized service center or
clean it yourself as described below.
How to tell when the filter needs cleaning (II)
1 The EH-4 AC adapter (available separately) is required for this method.
Turn the camera off and connect the AC adapter.
2
Remove the lens and turn the camera on.
3 Keeping the button held down, turn the main command dial to select
Custom Setting 8, then turn the sub-command dial to select option 1. The
mirror will be raised to the up position and the shutter curtain will open.
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Technical Notes: Cleaning the CCD