1st AC
First assistant camera — the camera department crew member responsible for focus pulling, camera maintenance, lens management, and supervising the 2nd AC.
1st AC
noun | Production & On-Set
First assistant camera — the camera department crew member who reports directly to the camera operator and director of photography, responsible for maintaining accurate focus throughout every take (as focus puller), building and maintaining the camera package, managing lenses and accessories, operating the clapperboard, and supervising the second assistant camera (2nd AC). The 1st AC is the camera operator's closest technical collaborator and carries significant responsibility for the technical integrity of every image captured during principal photography.
Quick Reference
| Domain | Production & On-Set |
| Also Called | Focus puller (when referring specifically to the focus responsibility) |
| Reports To | Camera operator; DP |
| Supervises | 2nd AC (second assistant camera) |
| Union | IATSE Local 600 (in the United States) |
| Core Responsibilities | Focus pulling, camera build/maintenance, lens management, slating, camera report |
| Related Terms | Focus Puller, Rack Focus, Depth of Field, Slate, Local 600 |
| See Also (Tools) | Depth of Field Calculator |
| Difficulty | Foundational |
The Explanation: How & Why
The 1st AC occupies a specific position in the camera department hierarchy: below the camera operator in terms of direct creative authority over the frame, but above the 2nd AC in terms of technical responsibility and supervision. The role combines the most demanding technical skill in the camera department — focus pulling — with a broader set of preparation, maintenance, and coordination duties that keep the camera package functioning effectively throughout the production.
Full responsibilities of the 1st AC:
Focus pulling: The primary on-set responsibility during takes. The 1st AC operates the lens focus ring — through a mechanical follow focus or wireless focus motor — to keep the intended subject sharp throughout every shot. This requires measuring subject distances before each take, pre-marking the lens ring, and executing smooth, accurate focus adjustments during the performance. See the Focus Puller entry for a detailed breakdown of this responsibility.
Camera build and prep: Before principal photography begins and at the start of each shooting day, the 1st AC builds the camera package — assembling the camera body, attaching the lens, setting up the matte box, mounting the follow focus, connecting the video assist and monitor, and configuring all accessories. The specific build changes for each setup as lenses and configurations change.
Lens management: The 1st AC selects, mounts, and changes lenses throughout the day according to the DP's instructions and the shot list. They maintain the lens set — cleaning, checking for scratches or fungus, and ensuring all lenses are available and correctly stored between uses. They also check the lens for the correct T-stop and confirm the aperture setting before each take.
Camera maintenance: The 1st AC is responsible for the camera's mechanical and electronic health during production — monitoring for technical faults, cleaning the sensor or film gate between setups, managing power and battery changes, and troubleshooting any equipment issues that arise on set.
Clapperboard operation: The 1st AC or 2nd AC operates the clapperboard at the start of each take — calling the scene and take information and clapping the sticks to provide a sync point. The 1st AC typically calls the board verbally while the 2nd AC holds and claps it, though this division varies by production and preference.
Camera report: The 1st AC maintains the camera report — a detailed log of every take, recording the scene number, take number, lens, aperture, filter, whether the take is a print, and any technical notes. This document is essential for post-production and for the camera rental house's records.
Supervising the 2nd AC: The 1st AC supervises the 2nd AC, assigning tasks, ensuring the camera prep is thorough, and managing the camera department's workflow throughout the day. On larger productions with multiple camera units, the 1st AC of each unit leads their own assistant camera team.
The career path:
The standard camera department career progression is: production assistant or camera trainee, then 2nd AC (loader), then 1st AC, then camera operator, then director of photography. Each stage builds the technical and collaborative skills required for the next. The 1st AC position typically represents several years of professional experience and demonstrated technical proficiency, and is the last rung before the creative camera roles of operator and DP.
Historical Context & Origin
The first assistant camera position developed alongside the professionalisation of the camera department through the Hollywood studio era. As cameras became more mechanically complex and as production economics required faster lens changes, more precise focus control, and systematic documentation of what was photographed, the single camera operator role was divided into the operator (who frames and moves the camera) and the assistant (who handles technical preparation, focus, and documentation). The specific title "1st AC" distinguishes the first assistant from the second, reflecting the hierarchical structure of the camera department that became standard in the studio system.
How It's Used in Practice
Scenario 1 -- Day Prep (1st AC): The 1st AC arrives at the camera prep facility the day before principal photography to build and test the camera package. They mount each lens and check for proper T-stop calibration, clean the sensor, test the follow focus and focus motor systems, charge all batteries, configure the camera menus to the DP's specifications, and confirm all accessories are present and functional. A thorough camera prep prevents on-set technical problems.
Scenario 2 -- Setup Change (1st AC / DP): The shot list calls for a change from a 50mm lens to a 100mm for the next setup. The DP confirms the change; the 1st AC removes the 50mm, mounts the 100mm, resets the follow focus marks for the new focal length, and confirms the T-stop setting matches the DP's instruction. The entire lens change is completed in under two minutes on a well-organised camera cart.
Scenario 3 -- Critical Take (1st AC / Director): A dialogue scene has a critical performance take that cannot be re-shot — the lead actor is on their last day of availability and the location closes tomorrow. The 1st AC knows this is the take that must work technically. They measure every actor position with particular care, rehearse the focus pulls multiple times, and confirm their wireless focus system battery is full before the camera rolls. The technical preparation is as thorough as the circumstances require.
Usage Examples in Sentences
"The 1st AC caught a piece of dust on the sensor between setups. If she had not checked the gate, it would have been in every shot for the next hour."
"Lens change — going to the 100mm." The 1st AC is already reaching for the case before the sentence ends.
"The 1st AC is the DP's technical right hand. If the camera is not working correctly, the DP knows about it immediately."
"At the end of each day, the camera report goes to the lab and the rental house. It is the 1st AC's responsibility to complete it accurately."
Common Confusions & Misuse
1st AC vs. Camera Operator: The camera operator looks through the viewfinder and controls framing and movement. The 1st AC stands beside the camera and controls focus and technical preparation. Both are looking at the same shot from different perspectives — the operator sees the composition; the 1st AC manages the technical execution. On small productions a single person may do both, but on professional productions they are distinct roles.
1st AC vs. 2nd AC: The 2nd AC assists the 1st AC — loading magazines or formatting media cards, slating, keeping the camera reports, and assisting with camera prep and set operations. The 1st AC supervises the 2nd AC. The 1st AC is responsible for focus and camera maintenance; the 2nd AC handles the supporting tasks that allow the 1st AC to concentrate on those responsibilities.
Related Terms
- Focus Puller -- The alternative title for the 1st AC that specifically names the focus responsibility; the two terms refer to the same role
- Rack Focus -- A deliberate focus shift executed by the 1st AC during a take; one of the most visible and demanding focus operations
- Depth of Field -- The optical range the 1st AC must keep the subject within; calculated before each setup using lens, aperture, and distance data
- Slate -- The clapperboard operation that the 1st AC (or 2nd AC under the 1st AC's supervision) performs at the start of each take
- Local 600 -- The IATSE union local that represents 1st ACs (and other camera department crew) on union productions in the United States
See Also / Tools
The Depth of Field Calculator is the 1st AC's essential planning tool — calculating the depth of field for every combination of lens, aperture, sensor size, and subject distance before arriving on set allows the focus puller to understand their working margins for each setup.
