Nikon AI-S TC-16- TC-16S - Manual (Page 20)

EXPOSURE DETERMINATION
Using the TC>16 not only increases the elfective focal length by 1.6X, but also
decreases the effective aperture by a 1 -1 /3 f/stop.
Thus, when the TC-16 teleconverter is in use, you should disregard the prime
lens's engraved aperture scale.
If the TC-16 is attached to lenses with a maximum aperture larger than f/1.8
(e.g., 50mm f/1.2, 50mm f/1.4, 35mm f/1.4, etc.), the effective aperture becomes
f/2-9 even if the aperture is larger than f/1.0. Thus, when using fast lenses, be
sure to set the aperture to f/1.8 or smaller; otherwise, incorrect exposure will
result.
In addition, some exposure compensation will be required with lenses that have
maximum apertures larger than f/1,8. For exposure compensation based on
ASA/ISO film speed adjustment, refer to the following table:
Lens Max. Aperture
Compensation Required
(at ASA/ISO 100)
f/1.2
2/3 f/stop underexposure
(set to ASA/ISO 160 position)
f/1.4
1/3 f/stop underexposure
(set to ASA/ISO 125 position)
NOTES ON THE USE OF THE TC-16
1. The AF Teleconverter TC-16 cannot be used with any camera other than
the Nikon F3AF with the DX-1 AF Finder attached. It provides only auto­
focus—not focus-aid—operation.
2. When you're not using the TC-16, set its ON/OFF switch to the "OFF"
position; otherwise the batteries of the DX-1 which power the TC-16 may
be drained,
3. During autofocus operation, hold the TC-16 properly because inadvertent
touching of the focus lock button will prevent the teleconverter's lens
elements from moving.
4. When it is cold, use the optional accessory Anti-Cold Battery Holder DB-4
to stabilize the DX-1 AF Finder’s battery power; if the batteries powering
the DX-1 are adversely affected by the low temperature, this will likewise
affect the TC-16's autofocus response.
TIPS ON TELECONVERTER CARE
Always keep in mind that your TC-16 is a high-precision optica! accessory and
that rough, careless handling may damage it. Observe the following tips, and
the TC-16 will always work as perfectly as the day you bought it.
• Keep clean and protect the surface of the electrical contacts (J) of the TC-16
from dust and dirt; otherwise, electrical malfunction may occur.
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