David F. (Mike) Smith, 75, Associated Press photographer who covered presidents and Hollywood stars for 44 years. The Los Angeles-based Smith's subjects included Presidents Dwight D. Eisenhower, John F. Kennedy, Lyndon B. Johnson and Richard M. Nixon, and entertainers Humphrey Bogart, Spencer Tracy, Audrey Hepburn, Gregory Peck and James Stewart. A native of San Diego County, he was a past president of the Press Photographers Assn. of Greater Los Angeles. On Thursday in Burbank of cancer.