New Camera Does Realtime Holographic Capture, No Coherent Light Required

February 26, 2025 by Donald Papp 28 Comments

Holography is about capturing 3D data from a scene, and being able to reconstruct that scene — preferably in high fidelity. Holography is not a new idea, but engaging in it is not exactly a point-and-shoot affair. One needs coherent light for a start, and it generally only gets touchier from there. But now researchers describe a new kind of holographic camera that can capture a scene better and faster than ever. How much better? The camera goes from scene capture to reconstructed output in under 30 milliseconds, and does it using plain old incoherent light.

The camera and liquid lens is tiny. Together with the computation back end, they can make a holographic capture of a scene in under 30 milliseconds.

The new camera is a two-part affair: acquisition, and calculation. Acquisition consists of a camera with a custom electrically-driven liquid lens design that captures a focal stack of a scene within 15 ms. The back end is a deep learning neural network system (FS-Net) which accepts the camera data and computes a high-fidelity RGB hologram of the scene in about 13 ms. How good are the results? They beat other methods, and reconstruction of the scene using the data looks really, really good.

One might wonder what makes this different from, say, a 3D scene captured by a stereoscopic camera, or with an RGB depth camera (like the now-discontinued Intel RealSense). Those methods capture 2D imagery from a single perspective, combined with depth data to give an understanding of a scene’s physical layout.

Holography by contrast captures a scene’s wavefront information, which is to say it captures not just where light is coming from, but how it bends and interferes. This information can be used to optically reconstruct a scene in a way data from other sources cannot; for example allowing one to shift perspective and focus.

Being able to capture holographic data in such a way significantly lowers the bar for development and experimentation in holography — something that’s traditionally been tricky to pull off for the home gamer.

Behind The Lens: Tearing Down A Rare Soviet Zenit 19

February 23, 2025 by Heidi Ulrich 3 Comments

If you’re into Soviet-era gear with a techy twist, you’ll love this teardown of a rare Zenit 19 camera courtesy of [msylvain59]. Found broken on eBay (for a steal!), this 1982 made-in-USSR single-lens reflex camera isn’t the average Zenit. It features, for example, electronically controlled shutter timing – quite the upgrade from its manual siblings.

The not-so-minor issue that made this Zenit 19 come for cheap was a missing shutter blade. You’d say – one blade gone rogue! Is it lost in the camera’s guts, or snapped clean off? Add to that some oxidized battery contacts and a cracked viewfinder, and you’ve got proper fixer-upper material. But that’s where it gets intriguing: the camera houses a rare hybrid electronic module (PAPO 074), complete with epoxy-covered resistors. The shutter speed dial directly adjusts a set of resistors, sending precise signals to the shutter assembly: a neat blend of old-school mechanics and early electronics.

Now will it shutter, or stutter? With its vertical metal shutter – uncommon in Zenits – and separate light metering circuitry, this teardown offers a rare glimpse into Soviet engineering flair. Hungry for more? We’ve covered a Soviet-era computer and a radio in the past. If you’re more into analog camera teardowns, you might like this analog Pi upgrade attempt, or this bare minimum analog camera project.

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A 3D Printed Camera You Can Now Download, Shutter And All

February 13, 2025 by Jenny List 16 Comments

A couple of years ago we were excited to read news of an entirely 3D printed camera, right down to the shutter. We wrote it up back then but sadly the required STL files were not yet available. Now after time away with his family, its creator [Mark Hiltz] is back. The medium-format Pioneer Camera can now be downloaded for printing in its entirety under a Creative Commons licence.

Looking at the design, it appears to be a relatively straightforward build. The shutter is extremely simple, as far as we can see, relying on magnets to ensure that the open part of its rotation is at an unstable repulsing point between stable magnetic poles. The images aren’t perfect because he’s using a very simple lens, but this is part of the charm of a camera like this one. We hope that people will take it and produce refinements to the design making for a cheap and good entry to medium format photography.

While you’re printing your own Pioneer, take a look at our original coverage.

A Waist Level Viewfinder For Not A Lot

January 26, 2025 by Jenny List 8 Comments

Photographic accessories are often plagued by high prices, as photography is considered a rich man’s game. It doesn’t have to be that way though, and [Snappiness] is here to get you started on the route to cheaper kit with a waist-level viewfinder project.

If you’ve used a twin-lens reflex camera then you should be familiar with a waist level viewfinder, it’s a lens and mirror arrangement allowing the photographer to frame the shot looking down from above. Modern cameras often have no viewfinder, so this is aimed at digital compacts without flip-up screens.

It has three components, all available for relatively low prices, and mounted in a 3D printed case. There’s a prime lens, a mirror, and a Fresnel lens forming the part the photographer looks through. It’s a simple device, but still one which would cost a lot more off the shelf. The video is below the break.

It might interest you to know that this is not the first viewfinder project we’ve brought you for digital cameras.

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Camera Slider Uses Repositionable Rail To Do Rotational Moves

December 23, 2024 by Lewin Day 2 Comments

You can buy motorized camera sliders off-the-shelf, but they’re pretty costly. Alternatively, you can make one yourself, and it’s not even that hard if you’re kitted out with a 3D printer. [Creative 3D Printing] did just that with a nifty design that adds rotation into the mix. Check it out in the video below.

Why should a camera get all the fun? Try your phone.

The basic slider is built out of 3D-printed components and some good old aluminum extrusion. A small 12-volt motor trucks the camera cart back and forth using a leadscrew. It’s torquey enough and slow enough that there isn’t much need for more advanced control—the motor just does the job. There’s also a limit switch set up to trigger a neat auto-reverse function.

The neat part, though, is the rotational mechanism. A smooth steel rod is attached to the slider’s housing, which can be set up in a straight line or aligned diagonally if desired. In the latter case, it rotates the mounting on the camera cart via a crank, panning the camera as it moves along the slider’s trajectory.

It’s a mechanically sophisticated design and quite unlike most of the camera sliders we feature around these parts.

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DIY Camera Slider Moves And Rotates For Slick Shots

December 22, 2024 by Lewin Day 14 Comments

Camera sliders are a popular project for makers—especially those who document their projects on video. They’re fun and accessible to build, and they can really create some beautiful shots. [Lechnology] set about to follow in this fine tradition and built a rather capable example of his own. Check it out in the video below.

The slider relies on V-slot rails, perhaps most familiar for their heavy use in modern 3D printers. The rails are paired with a 3D-printed camera carriage, which runs on smooth rubber rollers. A chunky stepper motor provides drive via a toothed belt. Trinamic motor controllers were chosen for their step interpolation feature, making the motion much smoother.

The slider doesn’t just move linearly, either. It can rotate the camera, too, since it has an additional motor in the carriage itself. In a nice retro touch, the wires for this motor are run with an old coiled telephone cable. It’s perfect for the job since it easily extends and retracts with the slider’s motion. Controlling everything is an Arduino, with speed and rotational modes set via a tiny screen and a rotary encoder control.

It’s a very complete build, and it performs well too. The video it produces is deliciously smooth. We’ve featured some other great camera sliders over the years, too. If you want to dig into Trinamic drivers, we can get you started.

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Old 3D Printer Parts Repurposed Into DIY Camera Slider

December 22, 2024 by Lewin Day 7 Comments

What do you do with an old 3D printer? They’re full of interesting components, after all, from switches and motors to lovely smooth rails. [Mukesh Sankhla] had a great idea—why not repurpose the components into a motorized camera slider?

The heart of the slider is the 4020 V-slot aluminum profile. It’s upon this that the camera carriage rides, running on rubber rollers to keep things smooth. A stepper motor and belt are then used to move the slider at a constant speed up or down the rail while the camera gets the necessary shot. The build relies almost entirely on salvaged components, save for an ESP32, OLED screen, and a few buttons to act as the control interface. There are also the TMC2208 stepper motor drivers, of course, but they came from the salvaged Ender 3 unit as well.

This is a classic project. Many old 3D printers have pretty much the perfect set of parts to build a camera slider, making this build a no-brainer. Indeed, others have tread the same path. There are plenty of other potential uses around the lab or for soldering.

Meanwhile, the proof is in the pudding. Scope the slider’s performance in the video below.

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