Like the 5150s, the six megapixel 6150s sports a 2-inch LCD and claims that "although there is optical zoom available, the 4x digital zoom offers the creative freedom you may need to capture that memorable shot, " and mentions only the digital zoom on the spec sheet.
ENGADGET: Vivitar intros 6 megapixel 6150s and 8 megapixel 8600s at PMA