Camera Obscura for Canon PowerShot ELPH115IS

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Just in time for me to use it for Worldwide Pinhole Photography Day, here's a rather large attachment that allows a Canon PowerShot ELPH 115 IS to be used to capture pinhole images. To be more precise, it allows that little Canon to capture whatever image is projected onto the 150mm diagonal screen built-into the unit, and the front section described here makes that screen the target of a pinhole obscura. Now you're probably wondering why use that Canon compact. Well, pinhole resolution is fundamentally limited by the size of the image, so this big screen (roughly the size of a 4x5 film sheet) offers much better resolution than you can get directly using a pinhole with a small digital sensor. However, this particular Canon has the extra benefit that despite being a cheap and tiny 16MP camera, it can run CHDK -- which means it can be programmed to do an HDR capture sequence that can easily handle the huge dynamic range caused by light falloff in an ultrawide pinhole image. The photos of the pond, dandelions, and my 101-year-old aunt were all HDR sequences done with this rig.

About the author:
ProfHankD
I'm a Professor of Electrical and Computer Engineering at the University of Kentucky, best known for things like having built the world's first Linux PC cluster supercomputer in 1994... although around the 3D-printing world I'm probably best known for my HingeBox (which Tested popularized). My research group (Aggregate.Org) really is about improving computing systems by making the various SW+HW components work better together, which we do for many different types of computer systems: supercomputers, digital cameras, ... and now 3D printers. I had some experience with tool and die making using Bridgeport Series I CNCs as far back as the late 1970s, but my 3D printing adventure started in late 2012 with purchase of a MakerGear M2 for my lab to make custom camera parts in support of computational photography research. I now use multiple MakerGear M2 and Wanhao I3 3D printers, several semiconductor laser cutters, a 3040T CNC mill, a programmable paper cutter, and a small vacuum forming machine.

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