US Air Force

The Orbital Darkroom High above the atmosphere, the International Space Station serves as the ultimate vantage point for human curiosity. While most viewers see the finished, polished images of swirling clouds and neon city lights, the technical reality of capturing those moments is a grueling exercise in physics and light management. Don Pettit, a veteran astronaut known for his "Saturday Morning Science" experiments, and his mentee Matthew Dominick have transformed the station’s cupola into a high-tech observatory. Their collaboration represents a rare moment where a mentor and student fly together, bridging decades of orbital photography expertise with modern digital capabilities. Taking a photograph in space is not as simple as pointing and clicking. The station moves at roughly five miles per second, meaning the landscape below is a blur the moment the shutter opens. To combat this, Matthew Dominick and Don Pettit employ a combination of ultra-fast lenses and manual tracking techniques that turn the entire spacecraft into a stabilized camera rig. Neutral Density Filters and the Exposure Battle One of the most persistent hurdles in orbital photography is the extreme dynamic range between the sun-drenched Earth and the dim interior of the International Space Station. Traditionally, photos either show a perfectly exposed Earth with the astronauts in total darkness, or visible astronauts with the Earth rendered as a featureless white void. Don Pettit solved this by borrowing a technique from Hollywood cinematographers: neutral density (ND) filters. By applying four-stop ND filters to the cupola windows, the astronauts reduce the intensity of incoming sunlight by a factor of 16. This allows standard video cameras to balance the exposure, keeping detail in the bright clouds while making the crew visible in the foreground. For still photography, they often use a flash to pump light into the cabin, but for video—where flash is impossible—the filter is the only way to avoid "blowing out" the whites. Don Pettit prioritizes saving detail in the highlights, noting that while the human eye accepts deep shadows, it finds featureless white regions aesthetically jarring. Microgravity Stabilization and Prehensile Feet In the weightless environment of the International Space Station, the concept of a tripod is non-existent. Instead, the photographer’s body becomes the mount. Matthew Dominick describes a process of physical stabilization that involves wedging his feet into crevices or gripping handrails with his toes. He even utilizes specialized "Ninja socks" to gain better purchase on the station's interior surfaces. This leaves his hands free to manipulate the camera and remote shutter, essentially turning him into a three-armed operator. Tracking the Earth at night requires even more finesse. To capture sharp city lights without motion blur, the astronauts must "hand-track" the Earth. By keeping a specific landmark centered in the viewfinder’s crosshairs and moving the camera in sync with the station’s orbital path, they can extend exposure times. Even with modern equipment like the Nikon Z9 and a 50mm f/1.2 lens—a "light bucket" that sucks in every available photon—they often shoot at speeds like 1/320th of a second to ensure crisp results. When the goal is pinpoint stars, any exposure longer than a quarter-second with a 50mm lens will result in visible streaking due to the station's velocity. Hunting the Elusive Red Sprite Beyond city lights and hurricanes, the duo is currently engaged in high-stakes atmospheric hunting. Their target: Sprites. These are large-scale electrical discharges that occur high above thunderstorm clouds in the mesosphere. While Matthew Dominick recently captured a stunning "edge-on" view of a Sprite, the team is now chasing the "nadir" view—looking straight down through the top of the discharge. This requires a mix of meteorological forecasting and sheer persistence. They identify active thunderstorms just after sunset, when the Earth’s stored thermal energy creates the most violent upward discharges. Using a 200mm telephoto lens and a remote shutter locked into a rapid-fire mode, they can generate 3,000 images in a single pass over a storm. It is a game of probability; they have already taken 50,000 photos of dark cloud tops in their quest for a single vertical perspective of this rare phenomenon. Legacy in the Cupola The relationship between Don Pettit and Matthew Dominick highlights the importance of institutional knowledge at NASA. Photography in space is a perishable skill, passed down through backyard training sessions and shared time in the orbital mockup of the cupola. For Matthew Dominick, who grew up watching his father—a US Air Force photographer—the mission is about more than just science; it is a responsibility to translate the "insane view" of orbit into something the rest of humanity can understand. As Matthew Dominick prepares to return to Earth, the thousands of images currently clogging the International Space Station downlink serve as his contribution to that ongoing visual record.