V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 98
• Long
exposures.
The camera is “active” throughout the
exposure, not just when you partially press the shutter
release to activate the metering and focus systems. Thus,
when you take long exposures, you’re doing the same
thing as holding the shutter release partially down.
• Power consumption is also high when the camera is
connected to a computer or to a PictBridge printer.
This is
one of the reasons I recommend using an external card
reader for transferring files. While the camera is
connected to the computer via the USB cable and the
camera is on, the camera consumes significantly more
power than normal. It’s not unusual to see the battery
indicator go from full to half or half to empty when
transferring from multiple, large cards or shooting tethered
for a long period. The same is true for PictBridge sessions:
the camera is drawing significant power the entire time it
is connected to the printer, so remove the connection
when you’re not using it. Printing just 16 images with a
Sony PictureStation printer connected dropped my battery
power by almost half, for example.
• The WT-4 Wireless Transceiver draws significant power
from the camera.
While the D300 is relatively smart about
keeping the WT-4 in low-power or no-power modes when
the camera is not active, if you’re using a WT-4 you will
consume batteries much faster than without it. If the WT-4
is powered on continuously it will drain the camera’s
battery in less than three hours. Fortunately, Nikon times
out the power to the WT-4 after a few seconds when it
isn’t being used, so battery life is substantively better than
that.
Unlike the D2h, where the file sizes are small, the D300
has the additional attribute of keeping the wireless
transmitter active longer while transmitting a single
picture (at least at maximum resolution). Thus, if you’ve
used a D2h with the wireless transmitter, be prepared to
get fewer image transfers per battery charge with the
D300. That’s because the USB port and its associated