Condenser mics need power. Either phantom power (9 - 52 
volts with 48v the standard provided by most mixers) or 
mic plugin power (usually 1.5 - 9 volts) provided by many 
recording devices such as miniDiscs and camcorders. If you 
use an XLR adapter, it will not "pass-through" the plugin 
power. Thus, your battery powered Senn works with or without 
the adapter. The lapel mic would work if plugged either 
into the camcorder or its transmitter/reciever which provides 
the plugin power. I'd try plugging in the transmitter/reciever 
with the 1/8" jack into the XLR adapter and see if it works.

Hope this helps,
Rick