terraPinstax Wide Pinhole Camera Body

thingiverse

This project came to life when a friend requested that I design a pinhole camera body around an instant film back made by Lomography for the Belair Lomo camera. She wanted a wide angle of view but gave me free rein otherwise. I settled on a 35mm focal length and after some math worked out that the aperture should be 0.26 mm in diameter, giving a F Stop of f/136 in the middle but shooting at f/165 is a nice compromise between an overexposed center or dark, dark corners. The Lomography instant film back uses Fujifilm Instax Wide film packs, a popular and vibrant instant film stock available in various formats from Fujifilm and other manufacturers. Unlike professional film stocks, technical data is not provided for reciprocity failure behavior, so I'm testing the film to establish a reliable RF curve but still in the early stages. I previously designed a pinhole camera body to work with the Lomography Instax Mini film back for the Diana F+ camera and wrote about my struggles getting the film to work in a pinhole camera on Hackaday. **Film specifications** Film speed: ISO 800/30° Colour temperature: Daylight type (5500K) Resolving power: 10 lines/mm Photos per pack: 10 Film size: 108 mm × 86 mm (4.3 in × 3.4 in) Image size: 99 mm × 62 mm (3.9 in × 2.4 in) Aspect ratio: 1.618:1 Film pack size: 115 mm × 92 mm × 20 mm (4.5 in × 3.6 in × 0.8 in) The film is fast, but my testing reveals that exposures compensated for RF are much longer than many slower film stocks, causing a blue color shift when shooting outside designed exposure parameters. Colored filters may correct this, but don't expect accurate color rendering. **Attention** This work is licensed under the Creative Commons - Attribution - Non-Commercial license, which applies only to files and documents available for download from the Thing Files section of this design. All other related content, such as photographs, videos, and verbiage in "Description" or "Instructions," are excluded from this license with all rights reserved unless specifically available for download.