Sensor Crop and Focal Length: The Complete Reference Table for Every Major Camera

The DP Who Rented the Wrong Lens Because the Camera Changed

A director of photography confirms a 35mm prime as the establishing wide lens for a feature. The camera is listed as an ARRI ALEXA 35 in Super 35 mode in the prep documents. Four days before shooting, the director switches to a Sony FX9 for logistical reasons. The DP doesn't recalculate. The Sony FX9 has a full-frame sensor (35.7 x 23.8mm) rather than Super 35 (approximately 24.89 x 18.66mm). A 35mm lens on the FX9's full-frame sensor gives a horizontal field of view of approximately 54 degrees. The same lens on the ARRI ALEXA 35 in Super 35 mode gives approximately 46 degrees. The establishing shot that framed the entire building facade now cuts off the left wing. The camera position has to move further back, which puts it in the street, which requires a permit the production doesn't have.

Crop factor is not academic. It changes what the lens sees, and it changes practically when camera bodies change mid-production. This post is the reference table every DP should have before a lens order is placed.

How Crop Factor Works

Super 35 is the cinema industry reference standard for sensor size. It approximately corresponds to the dimensions of a 35mm film frame running at 4-perf, and most lens characteristics -- focal length, field of view, and depth of field -- are conventionally described in relation to Super 35.

A crop factor of 1.0x means the sensor is the same size as Super 35 and a lens performs exactly as its focal length implies. A crop factor below 1.0x (large format, full frame) means the sensor is larger and the lens produces a wider field of view than on Super 35. A crop factor above 1.0x (Micro Four Thirds, smaller sensors) means the sensor is smaller and the lens produces a narrower field of view -- it "crops in" on the image circle.

The formula:

Effective FOV Multiplier = Super 35 Reference Width / Actual Sensor Width

Use the Crop Factor Comparison tool to calculate the effective focal length of any lens on any sensor relative to Super 35, rather than performing this manually.

The Complete Reference Table

Cinema Cameras

Hybrid and Documentary Cameras

Sensor dimensions are manufacturer-published active image area figures as of early 2026. Some cameras offer multiple crop mode options; figures here reflect the primary or default recording mode.

What Crop Factor Changes in Practice

Field of view: A 50mm lens on the BMPCC 4K (MFT, 1.88x crop) gives the same field of view as a 94mm lens on a Super 35 camera. A 50mm on the ARRI ALEXA LF (0.74x) gives the same field of view as approximately a 37mm on Super 35. The same piece of glass, entirely different coverage. Use the Field of View Calculator to model this before ordering lenses.

Depth of field: Smaller sensors produce greater depth of field at the same f-stop and equivalent framing. To achieve the same depth of field on a BMPCC 4K that you'd get on a Super 35 camera at f/2.8, you need to open up to approximately f/1.5. This is important for documentary and run-and-gun work where the shallow depth of field look is a conscious choice. The Depth of Field Calculator handles this cross-sensor comparison correctly.

Lens compatibility and image circle: Cinema lenses are designed to cover specific image circles. A lens designed for Super 35 (PL-mount standard) may or may not cover a large format or full frame sensor. The crop factor table informs which lenses will vignette on which sensors. Always confirm image circle coverage before renting glass for a large format body.

Three Practical Implications

Implication 1: The "50mm Look" on Different Cameras

A director asks for the "50mm feel" -- a natural perspective with minimal distortion that approximates human vision. On a Super 35 camera, a 50mm prime delivers this. On the Sony FX9 (full frame, 0.73x), achieving the same field of view requires a 37mm. On a BMPCC 4K (MFT, 1.88x), the equivalent is a 27mm. If you order a 50mm as the "natural look" lens without checking the camera's crop factor, you'll get a different shot on each body. The crop factor explained post covers this in detail including the depth of field implications.

Implication 2: Multi-Camera Productions with Different Bodies

A production is using an ARRI ALEXA 35 as the A-camera and a Sony FX9 as the B-camera. The director wants matching fields of view for cutaway coverage. The A-camera uses a 35mm for its principal coverage. The FX9 is full frame with a 0.73x crop relative to Super 35. To match the 35mm field of view, the FX9 needs a 25mm lens. Ordering "matching 35mm lenses" for both cameras produces coverage that will not cut together without a noticeable change in perspective. The Crop Factor Comparison calculator models this directly.

Implication 3: Rehousing Vintage Glass

A DP wants to use vintage Super 35-era Zeiss lenses on a large format camera. The same 18mm lens that was an ultrawide on Super 35 becomes a standard wide on the large format sensor (approximately 13mm equivalent on Super 35). The lens may not cover the larger image circle at all, or may cover it with vignetting at the corners. Before committing to a rehoused vintage glass package on a large format body, verify both the image circle coverage and the effective focal length using the reference table above and the Crop Factor Comparison tool.

Pro Tips

Tip 1: When referencing focal lengths in a shot list or director's treatment, always specify the sensor format alongside the focal length. "50mm" is not a complete specification. "50mm on Super 35" is. This prevents confusion when the camera body changes during production, which it does more frequently than anyone plans for.

Tip 2: The BMPCC 4K's MFT sensor (1.88x crop) is the most common source of focal length misalignment on low-budget productions. Filmmakers who are accustomed to Super 35 or full frame lenses underestimate how much a 1.88x crop factor narrows their options. A 12mm lens on MFT gives approximately the same field of view as a 22mm on Super 35. There is no native MFT lens that gives an ultra-wide equivalent of a 10mm on Super 35 without a dedicated ultrawide MFT prime.

Tip 3: When a camera has multiple crop mode options (the Sony VENICE 2 can shoot in full frame or Super 35 crop mode), specify which mode is being used in the camera report and the shot list. The lens covering and effective focal length change between modes. A lens that fits the Super 35 crop mode may vignette in full frame mode on the same body.

Frequently Asked Questions

Why is Super 35 used as the reference instead of full frame?

Super 35 has been the dominant sensor format in cinema production since the film era and became the default for digital cinema cameras when they first emerged in the mid-2000s. Full frame (35mm stills equivalent) is a larger sensor and has become common in hybrid and large format cinema cameras, but the cinema industry calibrated lens focal length expectations against Super 35. Using Super 35 as the reference keeps crop factor descriptions consistent with how cinematographers traditionally discuss focal length and perspective.

Does crop factor affect lens sharpness or optical quality?

Crop factor doesn't change the optical quality of the lens itself, but it changes which portion of the image circle you're using. A lens that is sharp at the center but soft at the corners on a full frame sensor may appear sharper on a smaller sensor that only uses the center of the image circle. Conversely, if a lens has its best optical performance at full frame coverage, a Super 35 crop may not capture that full performance. These are minor considerations for most productions, but they matter when selecting vintage glass for cameras that use a non-standard sensor size.

How do I convert focal lengths if the reference is 35mm full frame (photography) rather than Super 35?

Some older references and many photography-based discussions use full frame 35mm still photography as the reference, not Super 35. To convert: Super 35 has a crop factor of approximately 1.39x relative to full frame 35mm stills. A 50mm lens on Super 35 is equivalent to approximately 70mm on full frame stills. This is why the "50mm looks natural" statement holds in photography (full frame reference) but a 35mm on Super 35 cinema is considered the natural perspective equivalent.

Does frame rate affect crop factor?

On most cameras, no. But some cameras apply a crop when recording at high frame rates that reduces the active sensor area. The Sony A7S III crops to APS-C when recording above 120fps in 4K, effectively changing from a 0.73x to a ~1.05x crop factor. The Sony FX9 similarly applies a slight crop in high-speed modes. Always check the manufacturer's specs for the specific recording mode being used before confirming lens choices for high frame rate setups.

Related Tools

The Crop Factor Comparison tool calculates effective focal length for any lens on any sensor in the table above. The Field of View Calculator uses crop factor and focal length together to produce frame width and height at a given shooting distance. The Depth of Field Calculator accounts for sensor size in its depth of field output, essential when comparing DoF across different camera bodies in the table.

Conclusion

Crop factor is a production planning specification, not a technical curiosity. It determines which lens gives you the frame you want, which lenses from an existing kit will work on a new camera body, and whether the coverage you scouted with one camera will match on another. This table is the reference to check before the lens order and before the camera body changes. If the camera is confirmed and the sensor is known, the right lens can be specified precisely -- and the wrong one doesn't make it onto the truck.

What was the most surprising crop factor discovery you've had when switching between camera platforms mid-production?