Lens Rear Cap GK-R2 for Contax G (Biogon)

• Depth for protruding rear lenses: With the Hologon 16mm and Biogon 21mm, the glass extends far out of the lens — the deep GK-R2 design keeps distance and prevents contact.
• Usable from wide-angle to telephoto: Compatible with Contax G lenses from Hologon 16mm to Vario-Sonnar 35-70mm, as well as standard focal lengths like Planar 45mm and Sonnar 90mm.
• Replacement for the rare original cap: Spare parts for the Contax G system are hard to find and often expensive.

Compatibility

• Carl Zeiss Hologon T* 16mm f/8
• Carl Zeiss Biogon T* 21mm f/2.8
• Carl Zeiss Biogon T* 28mm f/2.8
• Carl Zeiss Planar T* 35mm f/2
• Carl Zeiss Planar T* 45mm f/2
• Carl Zeiss Sonnar T* 90mm f/2.8
• Carl Zeiss Vario-Sonnar T* 35-70mm f/3.5-5.6

Scope of delivery

• 1x rear lens cap (GK-R2 design)

Technical details

• Material: bioplastic based on plants (PLA+)
• Color: black
• Mount: Contax G bayonet

Description

This rear cap is designed for the Contax G system and follows the deep GK-R2 design. This is crucial for the wide-angle lenses of the series, whose rear lenses protrude far into the body — the cap keeps enough distance to prevent scratches on the glass.

Mechanically, it also fits standard focal lengths like the Planar 45mm or Sonnar 90mm.