Depth of Field by Sensor Size Comparison Calculator

Enter your focal length and subject distance to compare depth of field across full frame, APS-C, Micro Four Thirds, and other sensor sizes at f/2.8.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter your lens's focal length
Input the focal length of the lens you are using in millimeters. Common values are 24mm for wide-angle, 50mm for standard, or 85mm for portraits.
2
Specify the subject distance
Provide the distance from your camera's sensor to the main subject in meters. Closer subjects inherently yield a shallower depth of field.
3
Review DoF across sensor sizes
The calculator instantly displays the depth of field, near/far focus limits, and hyperfocal distance for various sensor formats, including Full Frame, APS-C, and Micro Four Thirds.

Example Calculation

A photographer wants to compare how different camera sensor sizes affect the depth of field when using a 50mm lens to photograph a subject 3 meters away, aiming for a shallow depth of field.

Focal Length (mm)

Subject Distance (m)

Results

0.36 m

Tips

Achieve Shallower DoF with Larger Sensors

If your goal is maximum background blur (bokeh) and subject isolation, a larger sensor format like full-frame will naturally produce a shallower depth of field at the same equivalent focal length and aperture compared to smaller sensors.

Compensate on Smaller Sensors

To achieve a similar depth of field on a smaller sensor (e.g., APS-C or MFT) as on a full-frame, you'll need to use a lens with a shorter focal length or a wider aperture, or place your subject closer to the camera.

Consider the 'Look' for Your Subject

For portraits, shallow DoF helps isolate the subject, often favoring larger sensors. For landscapes or street photography, a deeper DoF might be desired, where smaller sensors can achieve more overall sharpness at wider apertures.

Comparing Depth of Field Across Sensor Sizes for Photographers

The Depth of Field by Sensor Size Comparison Calculator is an invaluable resource for photographers seeking to understand and control the visual impact of their images. This tool allows for a direct comparison of how different camera sensor formats—from full-frame to APS-C and Micro Four Thirds—affect depth of field (DoF) and the resulting background blur, or bokeh. By simply inputting focal length and subject distance, photographers can visualize the distinct near and far focus limits across various sensor sizes, empowering them to choose the right gear and settings to achieve their desired aesthetic.

Mastering Bokeh and Subject Isolation with Sensor Size

In photography, the choice of sensor size fundamentally impacts the aesthetic quality of depth of field and, consequently, the ability to isolate a subject from its background. Larger sensors, such as full-frame (36mm x 24mm), inherently produce shallower DoF at a given aperture and field of view, making them popular for portraits where creamy bokeh is desired. Conversely, smaller sensors like APS-C (typically 23.6mm x 15.7mm) or Micro Four Thirds (17.3mm x 13mm) yield deeper DoF, which can be advantageous for landscapes or street photography where more of the scene needs to be in focus without resorting to extremely narrow apertures. Understanding these differences allows photographers to predict how their gear will render a scene and make informed decisions about lens choice and camera settings.

Understanding the Depth of Field Formulas by Sensor Format

The core calculation for depth of field relies on the lens's focal length, the aperture (f-number), the distance to the subject, and the acceptable circle of confusion (CoC). The CoC is the critical variable that changes with sensor size, as a smaller sensor requires a smaller blur spot to appear "sharp" when viewed at a given output size. The calculator applies the standard DoF formulas, adjusting the CoC value for each sensor format (e.g., 0.03mm for full-frame, 0.02mm for APS-C, 0.015mm for MFT). This direct adjustment is why a 50mm lens at f/2.8 will produce a dramatically different depth of field on a full-frame camera compared to an APS-C or Micro Four Thirds system, even when framed identically.

Hyperfocal Distance = (Focal Length^2 / (Aperture * Circle of Confusion)) + Focal Length
Near Focus Limit = (Hyperfocal Distance * Subject Distance) / (Hyperfocal Distance + (Subject Distance - Focal Length))
Far Focus Limit = (Hyperfocal Distance * Subject Distance) / (Hyperfocal Distance - (Subject Distance - Focal Length))

These formulas, applied with sensor-specific CoC values, reveal the nuanced differences.

💡 To explore how different lenses and distances can distort objects within your frame, our Perspective Distortion Calculator offers further insight.

Comparing DoF for a 50mm Lens at 3 Meters

Consider a photographer using a 50mm lens to capture a subject 3 meters away, with an aperture of f/2.8, a popular setting for portraits.

Focal Length: 50mm
Subject Distance: 3 meters

Let's examine the depth of field for different sensor sizes:

Full Frame (CoC 0.03mm):
- Hyperfocal Distance: ~29.8 meters
- Near Focus Limit: ~2.83 meters
- Far Focus Limit: ~3.19 meters
- Depth of Field: ~0.36 meters. This shallow DoF effectively isolates the subject.
APS-C (1.5x crop, CoC 0.02mm):
- Hyperfocal Distance: ~44.7 meters
- Near Focus Limit: ~2.89 meters
- Far Focus Limit: ~3.11 meters
- Depth of Field: ~0.22 meters. A shallower DoF than full-frame, but with a narrower field of view (equivalent to 75mm).
Micro Four Thirds (2x crop, CoC 0.015mm):
- Hyperfocal Distance: ~59.6 meters
- Near Focus Limit: ~2.92 meters
- Far Focus Limit: ~3.08 meters
- Depth of Field: ~0.16 meters. The shallowest DoF, but with an even narrower field of view (equivalent to 100mm).

The primary result for Full Frame DoF (f/2.8) is 0.36 m, demonstrating how a larger sensor provides a desirable shallow depth of field for subject separation.

💡 When considering how DoF affects the perceived detail in printed images, especially for fine patterns, our Pattern Tile Print Size Calculator can be a useful companion.

Different Depth of Field Formulas and Their Nuances

While the fundamental depth of field (DoF) equations remain consistent, variations arise in how the "acceptable circle of confusion" (CoC) is determined and applied, leading to slightly different results across calculators or photography guides. Historically, CoC values were often based on a 25cm viewing distance for a 8x10 inch print, with a specific resolution threshold. Modern approaches often tie CoC directly to sensor pixel pitch or a percentage of sensor size, allowing for more precise calculations tailored to high-resolution digital viewing. Some formulas also simplify the hyperfocal distance calculation by omitting the lens's focal length from the denominator, particularly for telephoto lenses where its impact is negligible. For instance, while most calculators use a fixed CoC per sensor size, some advanced tools might allow for a user-defined CoC based on intended print size or viewing conditions, offering greater precision for specialized applications like astrophotography or macro work where critical focus is paramount.

Frequently Asked Questions

How does sensor size influence depth of field?

Larger camera sensors inherently produce a shallower depth of field than smaller sensors when using the same focal length and aperture to frame a subject equivalently. This is because larger sensors require a longer true focal length lens to achieve the same angle of view, and longer focal lengths contribute to shallower DoF. For example, a full-frame sensor will yield a shallower DoF than an APS-C sensor under identical framing conditions.

What is 'crop factor' and how does it relate to DoF?

Crop factor is a multiplier that describes how much smaller a camera's sensor is compared to a full-frame (35mm) sensor. For example, an APS-C sensor might have a 1.5x crop factor. While it doesn't physically change the lens's focal length, it effectively 'crops' the image, making a 50mm lens on APS-C behave like a 75mm lens in terms of field of view on full-frame, thereby influencing the effective depth of field.

Why do Micro Four Thirds cameras have deeper DoF?

Micro Four Thirds (MFT) cameras have smaller sensors (typically a 2x crop factor compared to full-frame) which results in a naturally deeper depth of field. To achieve a similar shallow DoF to a full-frame camera, an MFT user would need to use lenses with wider maximum apertures (e.g., f/1.4 on MFT to approximate f/2.8 on full-frame) or position the subject much closer to the camera.