Product Overview

The Pentax 645 Adapter K for 645 Lenses (model 38455) lets you bring the look of Pentax 645 medium-format glass onto your K-mount bodies – from classic film SLRs to modern DSLRs. It’s a solid, all-metal adapter built in Japan, designed to lock up tight with no wobble, no light leaks and no loss of image brightness, so your 645 lenses perform at their best on full-frame or 35mm formats.

In the field it’s a straightforward, no-nonsense tool: manual focus only, and you’ll meter using stop‑down techniques as the adapter doesn’t carry electronic contacts or an aperture lever. Once you’re set up, it works cleanly with common exposure modes like M, Av and Bulb, and can even be stacked with a 67‑to‑645 adapter to run Pentax 6x7 lenses on a K‑mount body. If you’re an Aussie shooter keen to squeeze more creative mileage out of your Pentax kit, this adapter is a tidy way to unlock the unique rendering of 645 lenses without changing camera systems.

Key Features

• Adapts Pentax 645 mount lenses to K-mount camera bodies, letting photographers use their existing medium format glass on DSLRs and film SLRs without changing systems.
• Supports full-frame and 35mm film formats, ensuring that the entire image circle of 645 lenses is utilised for maximum field of view and detail.
• Manual focus operation gives precise, tactile control over focus, ideal for deliberate composition and critical sharpness in studio or landscape work.
• Maintains image brightness with no light loss through the adapter, preserving exposure settings and low-light performance of attached lenses.
• Compatible with key exposure modes including M, Av and Bulb, allowing flexible shooting from fully manual to aperture-priority and long-exposure work.
• Can be stacked with the Pentax 67-to-645 adapter so photographers can mount Pentax 6x7 lenses on K-mount bodies for even broader lens compatibility.
• Durable metal construction is built to withstand regular field use, providing a solid, play-free connection between lens and camera.
• Engraved markings on the adapter make identification quick and easy in a busy kit bag or studio environment.
• Compact, lightweight design (around 142 g) adds minimal bulk to the camera setup, keeping the system portable for location shooting.
• Designed and manufactured in Japan, reflecting Pentax’s long-standing expertise in precision optical accessories.