Sony a-5074-531-a S-3-6 Group Lens Assembly

Product Description

The SONY a-5074-531-a is an OEM lens group assembly, specifically the S-3-6 group, designed for Sony interchangeable camera lenses. This internal optical component is a factory-spec replacement part used to restore proper image formation and autofocus performance in compatible Sony lens units. Lens group assemblies contain precision-ground optical elements aligned to tight tolerances. Replacement of this component is typically required after impact damage, optical delamination, or internal contamination that cannot be resolved by cleaning alone. This part is intended for trained camera repair technicians with experience in optical disassembly.

Based on the supplier reference to SEL2870GM, this assembly is associated with the Sony FE 28-70mm lens platform. It is used in professional camera repair shops and authorized Sony service centers. The repair application is the internal optical group replacement within that lens family, restoring optical performance to factory specification.

Key Features

• OEM Sony replacement optical group assembly for internal lens repair
• Factory-spec component for restoring image quality and autofocus accuracy
• Precision-aligned optical elements to maintain original lens performance
• Direct replacement for the S-3-6 group position within the lens optical path
• Intended for professional camera technicians and authorized service centers

Compatibility

Based on available supplier data, this assembly is referenced in connection with the SEL2870GM lens. Verify fitment against the specific Sony service documentation for your lens serial range before ordering.

Installation Notes

Installation of internal lens group assemblies requires disassembly of the lens barrel in a clean, dust-controlled environment. Technicians should use proper lens spanner wrenches and anti-static handling procedures throughout the repair. Power down and fully discharge any associated camera body before beginning service. Optical alignment after reassembly should be verified using appropriate collimation or focus-chart testing equipment.

Technical Specifications

• Part Classification: Internal Optical Group Assembly
• Group Position: S-3-6
• Part Type: OEM Replacement Component

Standard Information

• Brand: SONY
• Manufacturer Part Number: a-5074-531-a