I have a PD100A as well, the external mic is not included, and B&H suggests it is overpriced and to get something else...research... Sennheiser 416, $1,000, the standard. Audio Technica 4073a a great buy, $500 others, Sennheiser ME66/K6 combo AT 822, 825(posted 8939 days ago)check out http://www.equipmentemporium.com/micropho.htm and B&H 1-800-947-9939
good luck, Brian