Nikon D1 - Manual (Page 128)

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EC-AD1 PC Card Adapter
Using the PC card adapter, CompactFlash memory cards can be read by
computers equipped with PCMCIA card slots configured for ATA memory
cards.
DK-14 Antifog Finder Eyepiece
This viewfinder eyepiece prevents fogging in humid or cold conditions.
DK-2 Rubber Eye Cup
Prevents eye fatigue by making it easier to see the image in the viewfinder.
Eyepiece Correction Lenses
To accommodate individual differences in vision, five types of viewfinder
lenses are available with diopters of –3, –2, 0, +1, and +2.
DR-4 Right-Angle Viewing Attachment/DK-7 Eyepiece Adapter
The DR-4 attaches at a right angle to the viewfinder eyepiece, allowing you
to view the image in the viewfinder from above. The DK-7 is used when
attaching the DR-3 Right-Angle Viewing Attachment or the DG-2 Eyepiece
Magnifier to the D1.
Filters
Nikon filters can be divided into three types: screw-in, drop-in and rear-
interchange. With the exception of the R60, exposure compensation need
not be adjusted when a Nikon filter is attached (in the case of the R60, set
exposure compensation to +1). Filters manufactured by other makers may
interfere with autofocus or electronic rangefinding.
The D1 can not be used with Polar polarizing filters. Use the C-PL circular
polarizing filter instead.
If you are using a filter to protect the lens, it is recommended that you use
an NC or L37C filter.
When shooting with a filter attached, moiré may be observed when
shooting a subject against a bright light, or when a strong light source is in
the frame. In these conditions, it is recommended that you remove the filter
before shooting.
Technical Notes: Optional Accessories