terraPin 6X9 120 film Pinhole Camera by schlem

Last crawled date: 3 years, 1 month ago

Derived from the terraPin 6X6 pinhole camera, this shoots a wider frame at 6X9. Assembly is essentially the same, but the extension is printed in two parts, upside down to avoid overhang issues.
The terraPin 6X9 Pinhole Camera is unlike any other pinhole camera, 3D printed or otherwise. Developed after years of experience designing and constructing pinhole cameras, the terraPin is intended to be very easy to assemble, modify, and hack. Derived from the P6*6, this terraPin also uses 120 film, with a 6 X 9 cm frame, like many classic medium format cameras. Dozens of P6*6 / terraPin pinhole photographers around the world provided input and feedback to help shape the terraPin 6X9.
The "Slider" joint between the body and extension allows for effortless changes in focal length, angle of view, and magnification. One camera body and film transport mechanism can be used with multiple extensions, each with their own pinhole and shutter blade. At this time only a 40mm extension has been designed. Let me know your preferences and I will endeavor to meet them.
Assembly is a snap. A dovetail joint sandwiches the pinhole and shutter without fiddly fasteners. A single bolt holds the joint securely and provides a pre-load on the shutter fulcrum, and two more bolts clamp the shutter assembly to the slider. Reduced number of glued joints in the terraPin. Velvet or felt is no longer required for light-tight construction. NOTE There is the potential for a light leak at the bottom of the extension-body joint, which manifests at the top of a landscape photograph (remember the image is inverted on the film). For more information see thing:703591: terraPin Stawp Gap
See terraPin High-Strength Winder (1/4" shaft) for additional winder/knob options!
Because of the wider format and short focal length, there is significant light falloff across the frame. The center of the frame should be metered for f/154. A radius 1/4 the width of the frame meters at f/174, which makes the majority of the frame +/- 1/3 stop. The extreme corners are -1 2/3 stops compared to the center of the frame.
Other features:
Tripod mount
Frame indexing window with cover slide
Bolts secure the cap to the body during use for greater security
Greatly reduced fastener count
terraTool mini allen driver for opening/closing camera
Multiple knob choices to customize your terraPin (can be retro'd to any Schlaboratory 3D printed pinhole camera)
Dual winding knobs for precision indexing / rewinding (film swaps)
Lefty-friendly shutter assembly (easy to change orientation, but film indexing requires right-to-left film transport).
Film clips prevent unspooling of film during unloading ("fat roll")
Exposure calculations for center and 1/4 width metering.
STILL fits on the smallest of print beds (Body may require 45 degree rotation - Let me know if you need this!)
Designed for PLA 3D printing
CLICK HERE for 6X9 photos in my Flickr terraPin pool (tagged "t69").CLICK HERE for terraPin prototyping and development pictures.
To Do List:
Update User's Guide
Finish OpenSCAD script to generate trim plates to fit 52mm threaded rings for lens cap and filters
Expand exposure calculations for additional films
Assembly and instructional video
Customizer app for generating camera viewfinders
Detailed assembly instructions and illustrations
Upload more photos made with the terraPin 6X9
TBD
The terraPin 6X9 was modeled using Tinkercad and OpenSCAD. Credit and thanks to Thingiverse citizen Aubenc for the Knurled Surface Library v2, which greatly improves the appearance of my cameras.
Updates
Minor modifications to cap and film clip to improve fit Jan 2015
Added exposure data with reciprocity failure for Kodak Portra 160/400, 5/28/15 - see:
Pinhole_Exposure_Durations_t69_f174.pdf
ATTENTION
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.