<p>I can't comment on using the Nikon DSLR but your main problem is the L398A meter just does not have good low light capabilities.<br>
According to Sekonic's own website the EV range is 9-17 for reflected metering and 4-17 for incident metering at 100 ASA.<br>
More than likely your DSLR will meter to lower EV than that so try it.<br>
Also, there are many meters out there that can do much better lower EV numbers, probably EV 2 and up.<br>
One meter that is famous for low light is the Luna Pro SBC, I have one and I am amazed how it can meter in such low levels. I believe the range on the Luna Pro SBC starts at -4 with 100 ASA.</p>