Nikon Camera N90 - Manual (Page 204)

ACCESSORY COMPATIBILITY
The following accessories cannot be used with the Nikon N90
camera:
PK-1 ,PK-2, PK-3, PN-1, K2 BR-2 Rings
Body Cap BF-1
Eyepiece Accessories for F3HP/F3T.
• PK-1, PK-11, BR-4 and K1 Rings cannot be mounted directly
on AF Nikkor lenses,
• The advanced Nikon Matrix meter evaluates scene brightness
and contrast using an eight-segment sensor. Since colored
filters and neutral density filters which have a high exposure
factor will also significantly affect a scene's contrast rendition,
they may cause the meter to incorrectly identify the scene’s
actual contrast/brightness condition. The blue (B12), orange
(056) and red (R60) filters are examples of such colored
filters.
• Linear polarizing filters are not compatible with the viewing
system used in Nikon autofocus cameras. For the best results
and to maintain autofocus and exposure operation, we
recommend using a circuiar polarizer, which is fully
compatible with the Nikon system. Using a linear polarizer,
however, will not damage the Nikon system, and it may be
used for fully manual focusing and exposure settings made
without using the built-in meter or Electronic Rangefinder.
• Special filters, such as soft focus filters, cannot be used for
autofocus or for manual focus with Electronic Rangefinder.