Emolux Lens Adapter Pentax K to M42 — Infinity Focus with Lock (SB773)

The Emolux Lens Adapter Pentax K to M42 — Infinity Focus with Lock (SB773) is a mechanical adapter designed to mount Pentax K-mount lenses onto cameras or devices with an M42 screw thread. It provides a physical connection between two incompatible mounts while preserving manual control of aperture and focus. The SB773 model supports infinity focus and includes a locking mechanism that secures the lens to the adapter to prevent accidental rotation or separation during use.

Advantages

This adapter allows photographers and optical hobbyists to use Pentax K lenses on M42-threaded camera bodies without electronic communication, retaining the optical characteristics of the mounted lens. Infinity focus capability enables landscape and distant-subject photography without loss of focus range. The integrated locking mechanism offers a reliable mechanical hold, improving stability when composing and focusing. The all-mechanical design ensures durability and simple, tool-free operation.

Suitable for

• Photographers using vintage Pentax K lenses on M42 camera bodies
• Optical experiments and macro setups requiring manual lens control
• Film or digital systems with M42 mounts seeking compatibility with K-mount optics
• Studio and field work where a secure, locked lens attachment is necessary

Key specifications

• Mount conversion: Pentax K (female side for lens) to M42 (male screw thread for camera)
• Infinity focus support: yes — maintains infinity focus when used on compatible camera bodies
• Locking mechanism: mechanical lock to secure lens attachment
• Construction: metal alloy body for mechanical strength and durability
• Optical path: passive mechanical adapter with no electronic contacts or optical elements
• Compatibility note: intended for manual aperture and focus operation; no electronic communication or autofocus

How to use

Mount the Pentax K lens onto the adapter by aligning the lens bayonet with the adapter’s K-mount and turning until it clicks into place. Engage the locking mechanism to secure the lens against accidental rotation. Screw the adapter’s M42 thread into the camera’s M42 female mount until it is seated firmly. Adjust the lens aperture and focus manually on the lens; confirm infinity focus by focusing on a distant subject and, if necessary, fine-tune the camera’s focus assist or viewfinder settings. To remove the lens, disengage the lock and reverse the mounting steps.

Usage recommendations

Use the adapter on cameras that physically accept M42 threads and support manual focusing at infinity; avoid forcing threads and ensure the lock is engaged before operating the camera. Because the adapter has no electronic connections, verify metering and exposure control compatibility with your camera body and prefer manual or aperture-priority modes when required. Regularly check the locking mechanism and threads for wear and keep contact surfaces clean to maintain a stable mechanical connection.