The Pentax AF-240Z (distinct from the older "T" or "FT" series) is a dedicated electronic flash featuring a power-zoom head designed to automatically or manually match your lens focal length.
Key Specifications & Features
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Guide Number: 24 meters / 79 feet (at the 50mm setting) up to 28 meters / 92 feet (at the 135mm telephoto setting) at ISO 100.
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Zoom Coverage: Covers focal lengths ranging from 35mm up to 135mm, adjusting the spread of light to match the lens mounted on the camera.
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Recycle Time: Approximately 7 seconds with fresh cells.
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Power Source: Operates on four standard AA batteries (Alkaline or NiMH).
Compatibility & Differences from "T/FT" Models
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Unlike the older AF-240T/FT models which were built primarily for classic manual-focus or early electronic bodies (like the Super Program or SFX/SF1), the AF-240Z incorporates a digital control interface designed for later autofocus 35mm film SLR systems.
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It supports dedicated automated features like focus-aid beam projection and integrated auto-exposure communication with compatible film bodies. When mounted on non-communicating hot shoes or digital cameras, it will typically default to basic manual triggering via the central sync contact.