Experimental Twin Lens Reflex Pi Zero Camera

thingiverse

Work in Progress, print at your own risk. The design is printable with a Stereolithography (SLA) printer only. A resin or powder based one like the Form 1+ https://formlabs.com/store/us/form-1/ prints high-quality parts quickly and efficiently. I started a bit of a project designing and building a retro Pi TLR camera. So far I have created the shell, lens assemblies, internal mirror for the viewing lens and body designed with precision and care. **How it works:** The taking lens projects onto a 36mm ground glass square. An 8MP pi camera with a wide angle lens snaps a picture of the projected image on the ground glass. The ground glass produces a film grain effect that will be a physical part of the camera. The design may undergo significant changes throughout the build process. I also designed an electronics bay that easily screws onto the back, providing easy access to the internal components. The camera is quite small in size to be more portable and convenient to use. **Use:** Just like real TLR cameras, you hold the camera at waist level and look down at the 36mm ground glass. Using the focus knob brings the subject into focus and take a picture with the 12mm button in the front. There is no "live" picture on an LCD or electronic display but rather a pure optical viewfinder. You will only see the picture when you transfer it later or over WiFi through the Pi. **Parts List: Likely to change** **Optical Edmund:** 19mm Dia. x 80mm FL, Positive Meniscus Lens, Grade 1 Stock #73-931 15mm Dia. x 35mm FL, Positive Meniscus Lens, Grade 1 Stock #75-023 50 x 50mm Silver, 4-6λ Mirror Custom ordered 36mm dia 1.6mm thick 220-grit Ground Glass Diffuser Custom ordered 36mmx36mm 1.6mm thick 220-grit Ground Glass Diffuser **McMaster-Carr:** x6 Sealtapping philips Screws, No.0 L=3/8" x4 M3x4 CSK Machine Screws x4 M3 Hex Nuts, Thin x1 48 Pitch Rack for Plastic Gear 57655K61 x2 Nylon 24 tooth gears 57655K16 **Electronics:** x1 Pi Zero-W x1 8MP Pi Camera with Fisheye Lens x1 Momentary Button, SPST w/ LED 12mm x1 16GB micro SD card x1 PowerBoost 1000 Charger - Rechargeable 5V Lipo USB Boost @ 1A - 1000C x1 Lithium Ion Polymer Battery - 3.7v 2500mAh