The following are cameras and assorted photographic devices I have built over the past few years. Not an exhaustive list.
Instax SQ6 Modifications (2018)
A series of modifications aimed at bringing better optics to the Fujifilm Instax SQ6 instant camera.
A standalone digital medium format scanner camera, producing 0.8 megapixel (1024 x 768) images in 16-bit grayscale or 48-bit color.
Canon P TTL (2015)
Adding TTL (through-the-lens) metering to a 50-year old rangefinder camera, using a light-to-frequency converter, ATtiny85, and HP bubble display.
Completely open-source camera using off-the-shelf parts, including electronics and optics. Produces 6x6 images on 120 film using a 65mm f/6.3 singlet lens and electronically controlled shutter.
Superwide camera using Mamiya 50mm f/6.3 Press lens, making 6x9 images on 120 format. My first 3D printed camera, printed in Polyamide from Shapeways.
Twin lens reflex camera designed for 3x4 instant film and 120/220 roll film. Was the subject of a successful Kickstarter campaign, raising nearly $20k by over 100 investors.
Field 23 (2010), Field 23 ACME (2011)
Field camera based around the Mamiya 80mm f/2.8 lens and the 2x3 format. Was intended for 2x3 sheet film, but also found use with a 6x9 roll film back, and a 3x4 Polaroid back. A later iteration converted the rack-and-pinion focus to an ACME leadscrew type focus mechanism, and leather to waterproof composite bellows.
Accessories and stuff that didn't quite make it
Exposure metering, gum tin, and papercraft cameras!