Rating the lens, to engineering the design to fit, calculating the focal formula, it was a challenge from the start to make this Kamra work. Producing a visible focused image, sharp and bright enough to get an exposure with a sensitivity of ASA 3. Here are some of the documentation of the build.
|Globe Bulb ±100mm Ø and the standard E24 Light Bulb|
|Thomas Sutton Patent Spherical Aqua Lens drawing, Light bulb lens|
Thomas Sutton in 1895 submitted a design for a Spherical Aqua Lens, basically the world's first fisheye lense, I believe 30+ were only made. The Light bulb filled with water was an excellent substitute of that design too. *note* be mindful of weight/ volume, 1 millilitre = 1 gram.
|measuring the bulb, making the holder|
Figuring out how to mount the lens was also challenging, here is a full aperture opening (size of the bulb), profile of the bulb cut in plywood. *note* glass bulbs are not symmetrical.
|Bulb lens mounting|
Running test on focal length, aperture steps
|the focus train concept (left), the finalised design (right)|
|prototype kamra #3 Bulb finished Dec 2014|
|light bulb lens mounted on exterior of kamra|
|first print July 2015|
|further test lighting and results|
The concept of this camera is undeniably fascinating. I would love to develop this into a workable mobile unit, at a bigger format, 5 x 7, with wheels!