Cinematography: camera, lenses and shot design

In short

Cinematography is the craft of recording a moving image: choosing the camera and sensor, the lens and its aperture, the shutter, the exposure, and the size, angle, height and movement of every shot so that the story is told visually. It sits between the director's intent and the editor's material — a scene that is not covered or not exposed cannot be fixed later. Indian university syllabi (FTII Pune, SRFTI Kolkata, Whistling Woods, Jamia's AJK MCRC, and BA/B.Sc Film & TV programmes under UGC CBCS) examine it as both theory (optics, exposure, grammar of the shot) and practical (exercises, continuity tests, a graded reel). It is the single most tested area in entry interviews for camera assistant, focus puller, DIT, operator and junior DOP roles at production houses, OTT shows, ad films, news and corporate video, and in rental-house and equipment-technician jobs.

Explained

Camera, sensor and the recorded image

• Sensor converts light to charge. Almost all cinema cameras use CMOS with a Bayer colour filter array; the raw mosaic is de-bayered (debayering/demosaicing) to full RGB.
• Rolling shutter reads the sensor line by line — fast pans or whip movements skew vertical lines ("jello"); global shutter reads all lines at once and avoids it.
• Sensor formats (approximate active area): Super 16 — 12.5 × 7.4 mm; Super 35 (4-perf) — 24.9 × 18.7 mm; full-frame/large format — 36 × 24 mm; 65 mm — about 54 × 25 mm. Format fixes the field of view a given focal length gives.
• Resolution and containers: HD 1920×1080, UHD 3840×2160, DCI 4K 4096×2160, 6K/8K open gate. Shooting a larger "open gate" area gives room for reframing and stabilisation.
• Dynamic range is the span from clipping to noise, quoted in stops; modern cinema cameras claim about 14-17 stops. Dual native ISO gives two low-noise base sensitivities (for example 800 and 3200).
• Exposure Index (EI)/ISO is the rating you expose to; on a log camera it shifts where middle grey sits, trading highlight against shadow latitude.
• Encoding: raw (ARRIRAW, R3D, BRAW) keeps sensor data with white balance and ISO as metadata; log (LogC, S-Log3, V-Log) is a debayered, gamma-compressed image holding wide dynamic range; Rec. 709 is display-ready video with little grading latitude.
• Bit depth and chroma: 8/10/12/16-bit; 4:4:4 full chroma, 4:2:2 broadcast standard, 4:2:0 delivery/consumer. Low bit depth causes banding in skies and gradients.
• Colour standards: ITU-R BT.709 for HD, BT.2020 wide gamut and BT.2100 (PQ and HLG) for HDR, DCI-P3 for theatrical projection; ACES is the common interchange colour pipeline.
• Monitoring tools: waveform (luminance in IRE), histogram, vectorscope (hue/saturation), false colour (exposure by colour code), zebras, and a show LUT that previews the graded look over log.
• White balance in kelvin: tungsten about 3200 K, daylight about 5600 K; tint/magenta-green corrects fluorescent and LED casts.

Lenses: focal length, aperture and character

• Focal length (f) is the distance from the lens's rear nodal point to the sensor when focused at infinity; it sets magnification and angle of view, not "zoom quality".
• On Super 35: below about 18 mm ultra-wide; 18-28 mm wide; 32-40 mm normal (a normal lens is roughly the sensor diagonal, ~31 mm for S35, ~43 mm for full frame); 50-85 mm long; above 100 mm telephoto.
• Perspective: a wide lens close to the subject stretches depth, exaggerates gesture and enlarges foreground; a long lens from far away compresses planes, flattens features and isolates the subject. Perspective is set by camera distance, focal length only sets how much of it you frame.
• Aperture (iris) is measured as the f-number N = f/D, D being the entrance pupil diameter. The standard series 1 - 1.4 - 2 - 2.8 - 4 - 5.6 - 8 - 11 - 16 - 22 steps by √2, so each step halves the light.
• f-stop is geometric; T-stop is measured transmission including glass absorption and coating loss. Cinema lenses are marked in T-stops so two different lenses at T2.8 match on exposure — this is why a stills f/2.8 lens may be slightly darker.
• Prime lenses: one focal length, faster, sharper, lighter, cheaper per stop. Zoom: variable focal length, slower, heavier, invaluable for documentary, news and multi-camera.
• Anamorphic lenses squeeze the image horizontally (2x classic, 1.8x, 1.3x) to fill a taller sensor area and are unsqueezed in post; they give oval bokeh, horizontal blue flares, a shallower apparent depth and a 2.39:1 frame. Spherical lenses need cropping or a wider gate for scope.
• Lens defects used or avoided: barrel/pincushion distortion, vignetting, chromatic aberration, coma, field curvature, flare and veiling glare, focus breathing (field of view shifting as focus pulls), and MTF as the objective sharpness measure.
• Mounts and mechanics: PL, LPL, EF, E, RF; flange focal distance must be correct or infinity focus is lost; close-focus distance, front diameter (clip-on matte box), 0.8 mod gears for follow focus, and image circle (must cover the sensor or it vignettes).
• Filters: ND (and IRND, which also blocks infrared contamination), graduated ND for skies, circular polariser (kills reflections, deepens sky, costs 1-2 stops), diffusion (Black Pro-Mist, Hollywood Black Magic) to bloom highlights and soften skin.

Exposure and the shutter

• Exposure on the sensor is set by four controls: illumination on the subject, aperture, shutter time and EI/ISO; a change of one stop is a doubling or halving of light in any of them.
• Shutter angle is the cinema way of stating shutter time: a 180° shutter at 24 fps gives 1/48 s. The 180° (half-open) convention gives the motion blur audiences read as natural.
• A narrow shutter (90°, 45°) gives crisp, strobing motion (battle scenes, sports) and loses light; a wide shutter (270°, 360°) smears motion and is used for dreams or for scavenging light.
• Frame rate: 24 fps theatrical, 25 fps for Indian television (the 50 Hz/625-line PAL heritage; Doordarshan and Indian broadcast delivery remain 25 fps/1080i50), 30/60 fps for web and sport. Overcranking (shooting 48-120 fps, playing at 24) gives slow motion and costs light; undercranking speeds action.
• Flicker: on 50 Hz mains, HMIs and non-flicker-free LEDs beat at 50/100 Hz. Safe combinations are 25 fps with 180°, or 24 fps with a 172.8° shutter; always run a flicker test with practical lights and CRT/LED screens.
• Exposure discipline: meter with an incident meter for key, a spot meter for ratios, false colour on set; expose log slightly to the right of middle grey for cleaner shadows, but never clip skin or important highlights because clipped data is unrecoverable.

Depth of field and focus

• Depth of field (DOF) is the zone of acceptable sharpness. It depends on aperture, focal length, subject distance and the circle of confusion (c) — the largest blur circle still read as a point (about 0.025 mm for Super 35, 0.03 mm for full frame, 0.0125 mm for Super 16).
• DOF shrinks with a wider aperture, a longer lens, a closer subject and a larger sensor (for the same framing); it is roughly one-third in front of and two-thirds behind the focus plane at normal distances, becoming symmetric at macro distances.
• Hyperfocal distance is the focus setting at which depth extends from half that distance to infinity — the standard documentary and crowd-shot setting.
• Shallow focus isolates a face and is the default OTT/ad look; deep focus (small aperture, wide lens, lots of light) keeps planes legible for staging in depth.
• Focus pulling is the 1st AC's work: marks on the lens barrel and floor, tape measurement or laser/ultrasonic rangefinder, follow focus or wireless FIZ (focus-iris-zoom) motors. A rack focus shifts attention between planes within a shot.
• A split dioptre keeps a near and a far plane sharp simultaneously; macro and probe lenses handle extreme close work.

Shot design: sizes, angles, height and movement

• Shot sizes: extreme long shot (ELS/establishing), long/wide shot (LS, full figure), medium long shot (knees), medium shot (waist), medium close-up (chest), close-up (face), extreme close-up (eyes, detail), plus two-shot, over-the-shoulder (OTS), insert and cutaway.
• Angle: eye-level is neutral; low angle lends power and scale; high angle diminishes; Dutch/canted signals unease; top/overhead abstracts geography; POV puts the audience in a character's eyes.
• Height and lens pairing: always decide lens, height and distance together — a 25 mm at waist height is a different statement from an 85 mm at eye level, even if the frame size matches.
• Movement: pan and tilt (camera pivots on the head), dolly/track (camera travels), trucking/crabbing (lateral), crane/jib, Steadicam and gimbal, handheld, drone, slider, and zoom (focal length changes, perspective does not). A dolly-zoom (zoom out while tracking in) holds subject size while perspective collapses — the vertigo effect.
• Composition: rule of thirds, headroom, looking room/nose room in profile, lead room ahead of movement, leading lines, frame within a frame, negative space, foreground layering, symmetry, and the safe action/title areas for broadcast delivery.
• Grammar and continuity: the 180° rule (keep the camera one side of the axis between two characters so screen direction holds); crossing the line disorients unless motivated by a visible move; the 30° rule (shift the camera at least 30° or the cut looks like a jump); eyeline match; matching eyelines and look direction in shot-reverse-shot; consistent screen direction for entrances, exits and chases.
• Coverage: the master-scene method — a master wide, then mid shots, singles, OTS and inserts, each overlapping in action so the editor has cut points. Alternatives are the long take/oner, in-camera editing, and multi-camera (serials, reality, live).
• Pre-visualisation: shot list, storyboard, floor plan with camera positions, lens chart from a camera test, recce stills, and a camera/lens test screened before the shoot.

Crew, workflow, Indian standards and law

• Camera department: DOP/cinematographer (light and lens decisions), camera operator, 1st AC/focus puller, 2nd AC/clapper loader (slate, marks, logs), DIT (data offload, LUTs, on-set grade), video assist, plus grips (dolly, key grip) and the electrical/gaffer team.
• Slate and reports: scene/shot/take numbering, clapper for sync, camera report with lens, stop, filter, frame rate and ND, and a card-report with checksums — no card is wiped until two verified copies exist (3-2-1 backup practice).
• Delivery: theatrical DCP (DCI-P3, 2K/4K, 24 fps), broadcast masters to the channel's spec (Indian TV 1080i50, 25 fps), OTT masters usually ProRes 422 HQ or IMF with separate stems.
• Certification: public exhibition in India needs a certificate from the CBFC under the Cinematograph Act, 1952 as amended by the Cinematograph (Amendment) Act, 2023, which introduced age-based categories U, UA 7+, UA 13+, UA 16+, A and S, made certificates perpetually valid and added penalties for unauthorised camcording/piracy.
• Copyright: under the Copyright Act, 1957, the author of a cinematograph film is the producer; a cinematographer's credit and any rights must be secured by contract. Clearances are needed for locations, music, artwork and trademarks seen on camera.
• Drones: aerial cinematography is governed by the Drone Rules, 2021 (DGCA) through the Digital Sky platform — airspace map with green/yellow/red zones, unique identification number, type certification and a remote pilot certificate from an authorised RPTO (nano-category drones carry relaxations). Rules and zone maps are amended frequently; verify the current conditions and any state or police permissions before a flight.
• Labour and safety: the Cine-Workers and Cinema Theatre Workers (Regulation of Employment) Act, 1981 is a former law — audio-visual production establishments now fall under the four Labour Codes in force from 21 November 2025, with the OSH&WC Code, 2020 covering working conditions, contractor obligations, and welfare on set. Practical safety is still contractual and association-led: electrical safety for lamps and generators, rigging and fall protection, firearms and pyrotechnic permissions from local police, and crowd/traffic permits.

Key points

• Focal length - sets angle of view and magnification for a given sensor; it does not by itself set perspective.
• Camera distance - the real control over perspective distortion; moving the camera changes depth relationships, zooming does not.
• f-number - f/D; the √2 series means each marked stop halves or doubles exposure.
• T-stop - measured transmission; cinema lenses are marked in T-stops so different lenses match in exposure.
• Shutter angle - shutter time = (angle/360)/fps; 180° is the natural-motion convention.
• Overcranking - shooting above playback rate for slow motion; it costs light because the shutter time shortens.
• Depth of field - deeper with a smaller aperture, wider lens, farther subject and smaller sensor.
• Hyperfocal distance - focus setting giving sharpness from half that distance to infinity.
• Circle of confusion - the blur limit (≈0.025 mm on S35) that defines "acceptably sharp" in DOF maths.
• Crop factor - ratio of full-frame diagonal to the format diagonal; about 1.4 for Super 35, about 3 for Super 16.
• Anamorphic - horizontal squeeze (2x, 1.8x) for a 2.39:1 frame, with oval bokeh and horizontal flares.
• Log vs raw vs Rec. 709 - log is a gamma-compressed graded-later image; raw keeps sensor data with ISO/WB as metadata; Rec. 709 is finished video with little latitude.
• Dynamic range - usable stops between clipping and noise; clipped highlights are unrecoverable, noisy shadows are only partly so.
• 180° rule - stay one side of the action axis to preserve screen direction; the 30° rule prevents jump cuts.
• Looking room and headroom - compositional space ahead of a glance and above the head; the frame must breathe in the direction of attention.
• Master-scene coverage - wide master, then mids, singles, OTS and inserts with overlapping action for cut points.
• Rolling shutter - line-by-line readout causing skew on fast pans; global shutter avoids it.
• Flicker - 50 Hz mains lighting beats with the shutter; use 25 fps/180° or 24 fps/172.8° and always flicker-test.

Formulas and examples

Example 1 — Angle of view and crop factor (Super 35, 35 mm lens).

• Sensor 24.9 × 18.7 mm. Horizontal AOV = 2·arctan(24.9 / (2 × 35)) = 2·arctan(0.3557) = 2 × 19.6° = 39.2°.
• Diagonal = √(24.9² + 18.7²) = √(620.0 + 349.7) = √969.7 = 31.14 mm. Crop factor = 43.27/31.14 = 1.39.
• Full-frame equivalent = 35 × 1.39 ≈ 49 mm — so a 35 mm on Super 35 frames like a "normal" 50 mm on full frame. To hold that framing on full frame you need ≈ 49 mm; on Super 16 (diagonal 14.54 mm, CF = 2.98) you need 35/1.39 × 1 ... directly: f = 49/2.98 ≈ 16.4 mm.

Example 2 — Lens choice for a given frame size.

• Super 35 (w = 24.9 mm), actor 3 m from camera, want a medium shot about 1.5 m wide: f = (24.9 × 3000)/1500 = 49.8 mm → use a 50 mm.
• Same actor, want an 0.5 m wide close-up from the same 3 m (so the look does not change position): f = (24.9 × 3000)/500 = 149.4 mm → use a 150 mm.
• Check the reverse: a 50 mm at 3 m gives W = (24.9 × 3000)/50 = 1494 mm = 1.49 m, confirming the medium shot.

Example 3 — Hyperfocal and depth of field.

• Super 35, f = 35 mm, T/5.6, c = 0.025 mm. H = 35²/(5.6 × 0.025) + 35 = 1225/0.14 + 35 = 8750 + 35 = 8785 mm = 8.79 m. Focus there and everything from 4.39 m to infinity is acceptably sharp.
• Now focus at s = 3 m: D_n = 3000 (8785 − 35)/(8785 + 3000 − 70) = 3000 × 8750/11715 = 2241 mm ≈ 2.24 m; D_f = 3000 × 8750/(8785 − 3000) = 26,250,000/5785 = 4538 mm ≈ 4.54 m. Total DOF = 2.30 m, with 0.76 m in front and 1.54 m behind — the one-third/two-thirds split.
• Open to T/2 (3 stops wider, i.e. 5.6 → 4 → 2.8 → 2): H = 1225/(2 × 0.025) + 35 = 24,500 + 35 = 24,535 mm; D_n = 3000 × 24,500/(24,535 + 3000 − 70) = 73,500,000/27,465 = 2676 mm; D_f = 3000 × 24,500/(24,535 − 3000) = 73,500,000/21,535 = 3413 mm. DOF = 0.74 m — three stops cost about two-thirds of the depth.

Example 4 — Exposure, frame-rate change and ND.

• Incident meter reads 1000 lux, EI 800, 24 fps at 180° → t = (180/360)/24 = 1/48 s. N² = t × E × S / C = (1/48)(1000 × 800/250) = 3200/48 = 66.7 → N = 8.17 → set T/8.
• Director now wants 60 fps slow motion at 180°: t = (180/360)/60 = 1/120 s. Light loss = log₂(48/120 reciprocal) = log₂(120/48) = log₂(2.5) = 1.32 stops. Open from T/8 by 1⅓ stops → T/5.6 is one stop, a third more → T/5; or raise EI to 2000, or add light.
• Exterior daylight: the sunny-16 rule gives f/16 at 1/ISO, so at EI 800 that is f/16 at 1/800 s. At 1/48 s you have log₂(800/48) = log₂(16.67) = 4.06 stops too much light, and shooting wide open at T/4 (4 more stops from f/16) needs another 4 → about 8 stops. Required ND density = 8 × 0.301 = 2.41 → an ND 2.4 (8-stop) IRND; its transmission is 10^−2.4 = 0.004, i.e. 1/250 of the light.

Example 5 — Film footage and digital data.

• A 2 min 30 s take on 35 mm 4-perf at 24 fps: 150 s × 1.5 ft/s = 225 ft; a 400 ft magazine runs 400/90 = 4 min 27 s, a 1000 ft magazine 11 min 7 s.
• The same 2:30 on 16 mm: 150 × 0.6 = 90 ft; a 400 ft 16 mm load runs 400/36 = 11 min 7 s.
• Digital: a codec at 800 Mb/s for one hour = 800 × 3600/8000 = 360 GB/hour. Two cameras, 8 hours each, with a mirrored backup: 2 × 8 × 360 × 2 = 11.52 TB of card and drive capacity to plan for in a single day.

Where it is used

• Feature films and OTT series: Mumbai, Hyderabad, Chennai and Kochi units shooting on ARRI Alexa, Sony VENICE and RED with Cooke, Zeiss, Master Prime and Hawk anamorphic glass; rental houses such as Anand Cine Services and Light & Shade supply camera, lens and grip packages.
• Advertising and music video: high shooting ratios, overcranked product shots, probe and macro lenses, strict adherence to a storyboard agreed with the agency.
• Television and news: multi-camera serial floors and ENG/PTC shooting at 25 fps for 1080i50 broadcast delivery; shoulder-mount camcorders, zooms and on-camera monitoring.
• Corporate, education and e-learning video: single-operator shoots, interview two-camera setups, screen-capture inserts — the commonest first job for a film graduate.
• Camera department and post roles: 2nd AC/clapper loader, focus puller, DIT and data wrangler on set; colourist and online editor downstream, all of whom need the exposure and colour-pipeline theory above.
• Aerial, event and wedding cinematography: gimbals, drones flown under the Drone Rules, 2021, and fast primes for low-light mandap and reception coverage.

Interview questions

• Q: What is the difference between an f-stop and a T-stop? A: An f-stop is the geometric ratio of focal length to pupil diameter; a T-stop is the measured transmission including glass and coating losses, so two lenses set to the same T-stop expose identically.
• Q: Why does depth of field get shallower on a larger sensor? A: For the same framing you must use a longer focal length or move closer, and both reduce depth of field at the same stop.
• Q: What is the 180-degree rule, and when may you break it? A: Keep the camera on one side of the imaginary line between two subjects so screen direction stays consistent; it can be broken when a visible camera move or a character's move re-establishes the new geography, or deliberately to disorient.
• Q: You switch from 24 fps to 48 fps keeping a 180° shutter. What happens to exposure? A: Shutter time halves from 1/48 s to 1/96 s, so you lose exactly one stop and must open one stop, double the light or raise the EI.
• Q: Why is the 180° shutter the standard? A: It gives half a frame of motion blur, which matches the amount of smear audiences read as natural movement; narrower angles strobe, wider angles smear.
• Q: What is hyperfocal distance and why is it useful? A: The focus setting where depth runs from half that distance to infinity; focusing there maximises usable sharpness for run-and-gun, crowd and landscape work without a focus puller.
• Q: Log or raw — which would you choose, and why? A: Raw gives maximum grading latitude with ISO and white balance still adjustable, at the cost of data and processing; log is far lighter and fine for most episodic and commercial work where the look is largely decided on set.
• Q: How do you avoid flicker while shooting under Indian mains lighting? A: Shoot 25 fps at 180° (1/50 s), or 24 fps at 172.8°, use flicker-free ballasts and LED drivers, and run a test with the actual fixtures and any on-screen displays.
• Q: What does a dolly-zoom do, and how is it executed? A: It holds the subject the same size while the background perspective expands or collapses; the camera tracks in while the lens zooms out (or the reverse), matched so subject framing stays constant.
• Q: A 403-type problem on set: the camera shows skewed verticals on a whip pan. Cause and fix? A: Rolling-shutter readout; slow the move, use a shorter lens, raise the frame rate, or use a global-shutter camera.
• Q: What certificate categories can the CBFC now give an Indian film? A: U, UA 7+, UA 13+, UA 16+, A and S, under the Cinematograph Act, 1952 as amended in 2023, with certificates now perpetually valid.
• Q: Who owns copyright in a cinematograph film in India? A: Under the Copyright Act, 1957 the producer is the author of the film; a cinematographer's credit and any share of rights must be secured by contract.
• Q: How much storage would two cameras at 800 Mb/s need for an 8-hour day with a mirrored backup? A: 800 × 3600/8000 = 360 GB per camera-hour, so 2 × 8 × 360 = 5.76 TB, doubled for the mirror = about 11.5 TB.

Common mistakes

• Saying a zoom changes perspective — only moving the camera does; the zoom changes framing alone.
• Using 1/fps as the shutter time instead of (angle/360)/fps, and so getting every exposure and slow-motion calculation one stop wrong.
• Forgetting the crop factor when quoting a lens: a 50 mm is "normal" on full frame but long on Super 16.
• Omitting the circle of confusion or mixing metres with millimetres in hyperfocal and DOF formulas — always convert first.
• Exposing log footage as though it were Rec. 709 (flat and "correct" on the monitor), which underexposes the shadows and buries them in noise; monitor through a LUT or false colour instead.
• Shooting a scene without overlapping action across sizes, leaving the editor no cut points; and crossing the axis mid-scene so eyelines and screen direction break.
• Treating a wide-open aperture as automatically better — the sharpest, most forgiving results on most lenses are one to two stops down, and a shallow stop makes focus unachievable on a moving actor.
• Wiping a camera card before two verified, checksummed copies exist.

Related topics

Lighting for film and television · Sound for film: location recording and sound design · Editing and post-production workflow · Colour grading and the digital intermediate · Screenplay and direction: visual storytelling · Film and media law in India: certification, copyright and clearances