Something that haunts film photographers is the prospect of a film shortage. This won’t replace film in that event, but [Applied Science] demonstrates photography using leaves. That’s right, a plant can record an image on its leaves.
Anyone with a high-school level of education can tell you that the leaf is a solar energy harvester, with the green chlorophyll using CO2 scavenged from the air to make sugars in the presence of light. It stands to reason that this light sensitivity could be used to capture images, and indeed if you place a leaf in the dark for an extended period of time its chlorophyll fades away where there is no light. The technique described in the video below the break is different though, and much more sensitive than the days-long exposures required to strip chlorophyll. It relies on starch, which the leaf uses to store energy locally when it has an excess of light. Continue reading “Photography Goes Leaf Green”→
One of the fun aspects of our global community is that there are plenty of events at which we can meet up, hang out, and do cool stuff together. They may be in a Las Vegas convention center, a slightly muddy field in England, or a bar in Berlin, but those of us with a consuming interest in technology and making things have a habit of finding each other. Our events all have their own cultures which make each one slightly different from others.
The German events, for example, seem very political to my eyes — with earnest blue-haired young women seeking to make their mark as activists, while the British ones are a little more laid-back and full of middle-aged engineers seeking the bar. There are some cultural things which go beyond the superficial though and extend into the way the events are run, and it’s one of these which I think it’s time we had a chat about.
Our Community Takes Privacy Seriously
The relevant section about photography in the SHA2017 code of conduct.
The hacker community differs from the general public in many ways, one of which is that we tend to have a much greater understanding of privacy in the online age. The Average Joe will happily sign up to the latest social media craze without a care in the world, while we quickly identify it as a huge data slurp in which the end user is the product rather than the customer.
The work of privacy activists in our community in spotting privacy overreaches may pass unnoticed by outsiders, but over the years it’s scored some big wins that benefit everyone. Part of this interest in privacy appears at our events; it’s very much not done to take a photograph of someone at a hacker event without their consent. This will usually be clearly stated in the code of conduct, and thus if taking a picture featuring someone it’s imperative to make damn sure they’re OK with it. Continue reading “Privacy And Photography, We Need To Talk”→
Pan and tilt mounts have a number of uses that can increase the functionality of various types of cameras. Security cameras can use them to adjust the field of view remotely, astronomers can use them as telescope mounts to accurately track celestial objects, and of course photographers and videographers can use them to add dynamic elements to shots. But getting the slow, smooth, and reliable movement isn’t as simple as slapping some servos on a tripod. So unless you want to break the bank for a commercial mount, this DIY pan and tilt mount might be the way to go.
The mount is built largely out of 3D printed parts and a few fairly common motors, belts, pulleys, and bearings. The movements are controlled using stepper motors, and there are two additional systems built in so that focus and zoom can be controlled through the system as well. The software controlling it all is open-source and available on GitHub, and controls the mount remotely through a network connection. It’s also designed to use the readily-available ESP32 chip, making it overall fairly adaptable.
The system doesn’t slouch on features, either. It can move from one point to another with various programmable speeds, has a key sequencer for more complex movements, and can accommodate the needs of stop motion animators as well. It’s an impressive build that should be accessible to plenty of photographers with a 3D printer and the right parts, but photography and astronomy aren’t the only reasons to use a pan and tilt mount. Check out this one that brings some sunlight to a shaded room.
While most photographers have moved on to digital cameras with their numerous benefits, there are a few artists out there still taking pictures with film. While film is among the more well-known analog photographic methods available, there are chemically simpler ways of taking pictures available for those willing to experiment a little bit. Cyanotype photography is one of these methods, and as [JGJMatt] shows, it only takes a few commonly available chemicals, some paper, and a slightly modified box camera to get started.
Cyanotype photography works by adding UV-reactive chemicals to paper and exposing the paper similarly to how film would be exposed. The photographs come out blue wherever the paper wasn’t exposed and white where it was. Before mixing up chemicals and taking photos, though, [JGJMatt] needed to restore an old Kodak Brownie camera, designed to use a now expensive type of film. Once the camera is cleaned up, only a few modifications are needed to adapt it to the cyanotype method, one of which involves placing a magnet on the shutter to keep it open for the longer exposure times needed for this type of photography. There is some development to do on these pictures, but it’s relatively simple to do in comparison to more traditional chemical film development.
For anyone looking for a different way of taking photographs, or even those looking for a method of taking analog pictures without the hassle of developing film or creating a darkroom, cyanotype offers a much easier entry point and plenty of artists creating images with this method don’t use a camera at all. There are plenty of other photographic chemistries to explore as well; one of our favorites uses platinum to create striking black-and-white photos.
Much to the chagrin of Eastman Kodak, the world has moved on from chemical photography into the realm of digital, thanks to the ease of use and high quality of modern digital cameras. There are a few photographers here and there still using darkrooms and various chemical processes to develop film, and the most common of these use some type of chemistry based on silver to transfer images to paper. There are plenty of alternatives to silver, though, each with their unique style and benefits, like this rarely-used process that develops film using platinum.
This process, notable for its wide tonal range, delicate highlights, and rich blacks, produces only black and white photographs. But unlike its silver analog, it actually embeds the image into the paper itself rather than holding the image above the paper. This means that photographs developed in this manner are much more resilient and can last for much longer. There are some downsides to this method though, namely that it requires a large format camera and the negatives can’t be modified to produce various sized images in the same ways that other methods allow for. Still, the results of the method are striking for anyone who has seen one of these images in person.
As to why this method isn’t more common, [Matt Locke] describes a somewhat complicated history involving the use of platinum to create commercial fertilizers, which is an identical process to that of the creation of explosives, which were needed in great numbers at the same time this photographic method was gaining in popularity. While the amount of research and development that goes into creating weapons arguably generates some ancillary benefit for society, the effects of war can also serve to divert resources away from things like this.
A copy stand is a tool used to capture images of photos, artwork, books, and things of a similar nature. It holds a camera perpendicular to a large and flat surface, upon which the subject rests.
A threaded rod provides effective vertical adjustment.
They are handy, but there’s no need to spend a lot when [BlandPasta]’s DIY copy stand based on a cheap IKEA LACK table can be turned into an economical afternoon project with the help of simple hardware and a few 3D printed parts.
The main structure comes from a mixture of parts from two LACK tables: one small and one normal-sized. A tabletop is used as the bed, and the square legs make up the structural parts with the help of some printed pieces. A threaded rod combined with some captive hardware provides a way to adjust the camera up and down with a crank, while one can manually slide the horizontal camera mount as needed to frame the subject appropriately.
This is a clever remix of IKEA parts, and the somewhat matte white finish of the LACK complements photography well. Adding some DIY LED lighting is about all it takes to get a perfectly serviceable copy stand that won’t break the bank.
The build relies upon a regular micro servo to handle rotating the turntable. However, it has been modified from stock to rotate 360 degrees instead of its usual 180 degree range of motion. This is a common hack that allows servos to be used for driving wheels or other rotating mechanisms. In this case, though, any positional feedback is ignored. Instead, the servo is just used as a conveniently-geared motor, with its speed controlled via a potentiometer. A CD covered in paper is used as a turntable, with the electronics and motor assembled in a cardboard base.
