This is a stretched version of the the terraPin 6X6, designed to take two simultaneous exposures side by side, on medium-format 120 film. The camera shares many small parts with the original terraPin, with a few unique parts that are 2HT-specific.
This camera makes two 56mm by 56mm exposures, spaced by 61mm, which is nominally the inter-pupil distance for most adults. The camera is designed for two 0.30mm pinholes, with a "focal length" of 50mm, at f/167.
See terraPin High-Strength Winder (1/4" shaft) for additional winder/knob options!
To view the stereo photographs, you can "trick your eyes" while looking at adjacent prints, or you can use a viewer designed for either slides or prints. Included, find STL for 80X140mm frames that will work with the Holga 3D slide viewer and others.
To view the sample stereo photographs (from my first 3 rolls), view in full screen. You will need to cross your eyes (really) until you see three images. The center image will be 3D, like a Viewmaster slide set. It's awesome.
The CAD renders show shutter blades that open and close with a parallel throw, the original idea being to connect them with a crosspiece so that they could be operated simultaneously. I abandoned that idea for reasons of precision, stability, and durability. The shutter blades now move in opposite directions for a balanced motion to minimize camera motion during "fast" (< 3 sec) exposures. The shutters move outward to open and pinching them together closes them.
A friend gave me a link to this application, StereoPhoto Maker. I have only begun playing with this utility, but I can tell you it runs well with WINE on Linux. I used it to compose the stereogram photos in the gallery. It also makes "Anaglyphs", the red/blue 3D images that hearken back to 3D drive-in movies
This work is licensed under the Creative Commons - Attribution - Non-Commercial license. This license applies only to the files and documents available for download from the Thing Files section of this Thing.
All other related content (photographs, videos, and verbiage such as contained in "Description" or "Instructions" ) are excluded from this license. with all rights reserved, unless specifically available for download This notice constitutes a clarification, not a change, to licensing for this design.
Dimensioned for .25mm layers
30-50% for durability and light proofing
All parts are oriented on plate for optimal printing without support. Test you PLA for opacity BEFORE you print your camera. I have only found one PLA that is opaque enough for real photographic use - SHAXON 3mm black PLA. If you find another, please let me know. Test it with the brightest flashlight you can find. A 2mm thick plate should not show any light through it.
Pieces that mate and move may need some coaxing into the right shape and/or dimension. I find that ordinary metal milling files work well for this and they come in very small sizes. I tap the bolt holes that the shutters spin about. I use a 3mm tap predrilled with 3/32 inch drill bit. By hand. The assembly of the various parts should be obvious by virtue of shape and the assembly pictures that I will invariably be delinquent in posting.