Photography & Optics: Depth of Field & Exposure Guide
Hyperfocal distance, crop factors, exposure values, and video storage requirements.
Photography blends artistic vision with optical geometry. Mastering the exposure triangle (aperture, shutter speed, ISO), sensor crop factors, and depth of field allows photographers and cinematographers to achieve sharp, cinematic imagery in any lighting environment.
Where f is focal length, N is aperture f-number, c is circle of confusion (e.g. 0.03mm for full frame 35mm), and t is shutter speed in seconds.
Scenario: A landscape photographer using a 24mm lens at f/8 on a full-frame sensor (c = 0.03mm).
- Focal Length: 24 mm
- Aperture: f/8
- Circle of Confusion: 0.03 mm
- Numerator = 24² = 576
- Denominator = 8 × 0.03 = 0.24
- Hyperfocal distance = 576 / 0.24 = 2,400 mm = 2.4 meters (7.9 ft)
- Closing down aperture beyond f/11 or f/16 on high-resolution sensors introduces optical diffraction softness.
- Multiply focal length and f-number by your sensor's crop factor (1.5x for APS-C, 2.0x for Micro Four Thirds) to find 35mm equivalent field of view and depth of field.
- Follow the 180-degree shutter rule for video: set shutter speed to 1/(2 × frame rate) for natural motion blur (e.g. 1/50s for 24fps).
- Use our photo storage calculator to determine how many raw photo files fit on memory cards.
Put the formulas above into practice with these free tools:
Exposure Value (EV) Calculator
Convert aperture, shutter speed, and ISO into an exposure value.
Depth of Field Calculator
Near and far limits of acceptable sharpness for any lens setup.
Hyperfocal Distance Calculator
Find the focus distance that keeps everything to infinity sharp.
Crop Factor Calculator
Crop factor and full-frame equivalent focal length and aperture.
Field of View Calculator
Horizontal, vertical, and diagonal angle of view for a lens and sensor.
Reciprocal Rule Shutter Speed Calculator
Slowest shutter speed you can hand-hold without blur.
ND Filter Exposure Calculator
New exposure time after adding a neutral density filter.
Exposure Stops Difference Calculator
Compare two exposure settings and see the difference in stops.
Equivalent Exposure Calculator
New shutter speed that keeps exposure the same after changing aperture or ISO.
Print Size from Pixels Calculator
Largest print you can make from an image at a chosen quality.
Resolution Needed for Print Calculator
Pixels and megapixels required for a print of a given size.
Pixel Pitch and Diffraction Calculator
Pixel size and the aperture where diffraction starts to soften images.
What is the exposure triangle?
The balance between Aperture (depth of field), Shutter Speed (motion blur), and ISO (sensor signal amplification and noise).
What does depth of field depend on?
Aperture f-number, focal length, distance to the subject, and the camera's physical sensor format.
How is video bitrate converted to gigabytes per hour?
Multiply bitrate in Mbps by 3,600 seconds, then divide by 8,000 to get Gigabytes per hour (e.g. 100 Mbps ≈ 45 GB/hour).