Polaroid 4x5 back in very good condition. The Polaroid Type 100 Polaroid Back for 4x5 cameras is an instant film back that allowed 4×5 inch large format cameras to use Polaroid Type 100 film for instant image capture. Key features: -Compatibility: 4×5 inch large format cameras -Film type: Polaroid Type 100 series (e.g. Polaroid 669, 664, 667) -Use: For quick test shots before final 4×5 film exposure -Construction: Metal and plastic housing, easy to mount with spring or Graflok back mount - Weight: 800–1200 g - Size: 18 × 12 × 4 cm - Colour: Black - Shipping method: GLS This back plate was particularly useful for studio and portrait photography, where photographers could immediately check lighting and composition. It is now a rare item as Polaroid Type 100 films have been discontinued, but some photographers still convert it to other instant films.