Camera lens adapter JYC SB775 — Nikon Ai/AiS/AF mount to M42 with integrated glass element

The JYC SB775 lens adapter allows photographers to mount Nikon Ai, AiS, and AF lenses onto cameras with an M42 screw mount. This mechanical adapter contains an integrated glass element designed to preserve infinity focus and correct optical distance when attaching Nikon lenses to M42 bodies. It is a compact, metal-bodied accessory that bridges compatibility between different lens and camera systems without electronic communication.

Advantages

The adapter provides reliable mechanical connection and maintains focus to infinity thanks to the built-in optical element. It enables the use of a wide range of Nikon manual and autofocus optics on M42-format cameras while retaining lens aperture control and physical aperture rings where present. Construction from durable materials ensures stable mounting and repeatable alignment.

Suitable for

• Photographers using Nikon Ai/AiS/AF lenses on M42 screw-mount film cameras
• Owners of M42-adapted digital bodies with compatible mount rings
• Users who need to preserve infinity focus when adapting lenses
• Studio photographers and hobbyists experimenting with legacy Nikon glass

Key specifications

• Mount compatibility: Nikon Ai/AiS/AF lens mount to M42 screw-mount camera
• Integrated optical element to preserve infinity focus
• Mechanical adapter with no electronic contacts or autofocus transmission
• Material: metal construction for secure mounting
• Finish: black coating to reduce reflections

How to use

Attach the adapter to the M42 screw mount on the camera body by threading it securely until it seats flat. Align and mount the Nikon lens onto the adapter in the same manner you would mount it to a Nikon body, ensuring the lens locks into place. Set the lens to manual focus if the camera cannot drive autofocus; use the lens aperture ring to select the desired aperture where applicable. Verify infinity focus by focusing on a distant subject and adjust as necessary.

Usage recommendations

Because the adapter is mechanical and contains an optical element, avoid exposing the glass surface to scratches or strong impacts. Use manual focusing or a focus confirmation method on your camera if autofocus is not supported. When using digital converters or mount rings, ensure flange distance compatibility before mounting to avoid focus shift.