Nikon AF-S TC-20E III - Manual (Page 16)

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Recommended focusing screens
Nikon offers a variety of interchangeable focusing
screens for Nikon F6 or F5 cameras, to suit any type of
lens or picture-taking situation. Those recommended
for your teleconverter/lens combination are listed on
pages 144–145.
T= Excellent focusing
R= Acceptable focusing
Slight vignetting or moire phenomenon affects
screen image, but film image shows no traces of
this.
Y= Acceptable focusing
Split-image rangefinder, microprism or cross-hair
area is dim; focus on the surrounding matte area.
[= Indicates degree of exposure compensation
required in Center-Weighted metering. See User's
Manual of the camera body for more details.
f F= Exposure measurement not possible;
teleconverter/screen combination permits only
focusing operation.
Blank box means not applicable. Since type M screen
can be used for both macro photography at a 1:1
magnification ratio or higher and for
photomicrography, it has different applications than
other screens.
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Attaching to the lens
When removing the lens from the camera body to attach
the teleconverter, make sure that the camera's power is
turned off and avoid direct sunlight.
To attach
Attach the teleconverter to the lens so that the
teleconverter's lens mounting index is aligned with
the aperture index on the lens. Taking care not to
press the lens release lever, turn the teleconverter
counterclockwise (with the lens facing away from
you) until it clicks into place.
To remove
Slide back the teleconverter's lens release lever and
turn the teleconverter clockwise (with the lens facing
away from you) until the teleconverter's lens
mounting index is aligned with the lens' mounting
index.