The Quantaray QTB 7500A flash is a versatile photographic tool. This flash offers you superb Through-The-Lens auto results with a Pentax SLR Film AF Camera. This Flash-Set includes the QDA-PAF Flash Module - part of the two piece flash system designed to operate fully in conjunction with the auto focus and exposure controls built into your Pentax SLR Film Camera. The QTB 7500A features TTL exposure operation, a manual zoom head, a focus assist beam, bounce and swivel head, and guide numbers from 72 to 96 (depending on zoom position), an extra small flash on the front for filling in shadows, and an auto off. The QTB 7500A is a terrific flash for the general photographer.