Aperlux Photo Calc

Stop guessing what will be sharp. Aperlux Photo Calc turns your exact camera and lens into the four numbers that actually decide an image: depth of field, hyperfocal distance, and the two star-exposure limits astrophotographers live by. Everything is computed on your device from real sensor geometry — no charts, no website, no signal required.

Most "DOF apps" quietly assume a full-frame circle of confusion and hand you a rough lookup. Aperlux does the honest math. It reads the physical width and height of your chosen sensor, derives the true crop factor from the diagonal, and scales the circle of confusion (CoC) to that body before it computes a single result. Switch from a full-frame Canon to a 1-inch drone sensor and every number updates, because the underlying optics changed — not just a label.

WHAT MAKES THIS APP DIFFERENT

• A real, per-sensor circle of confusion — base CoC (0.02 / 0.03 / 0.04 mm) divided by the live crop factor, shown right on screen
• Four calculators fed by one shared sensor + focal setup, so you set the body once and read DOF, hyperfocal, and both star rules together
• Saved Profiles: store a camera-and-focal-length pair and tap to restore it instantly — Canon EOS 5D Mark IV 50mm, Sony A6400 35mm, DJI Mavic 3 24mm
• Every formula is printed above its inputs, so you can see the physics, not just trust it

KEY FEATURES

• Sensor presets: Canon EOS 5D Mark IV, Nikon Z6II, Sony A6400, Panasonic S1H, Fujifilm X-T4, DJI Mavic 3, iPhone 14 Pro, plus a fully custom sensor (enter width, height and megapixels)
• Live crop factor and internal CoC, recalculated the instant you change bodies
• Focal length field with quick chips: 14, 24, 35, 50, 85, 135, 200 and 500 mm
• Depth of Field: enter aperture and focus distance, get a hero Sharp Range plus exact near and far limits (far reads infinity past hyperfocal)
• Hyperfocal Distance: find the focus point that carries sharpness from half that distance all the way to infinity
• Star-Trail 500-Rule: a fast maximum shutter time before stars begin to streak
• Star-Trail NPF-Rule: a stricter, resolution-aware limit for pixel-level pinpoint stars on dense modern sensors
• One-tap copy of any result to your clipboard, formatted and ready to paste
• Metric or Imperial distances, seconds or minutes for exposure
• Live input validation with clear range hints so a bad value never fakes a result
• Three themes: Dark, Light and true-black AMOLED
• Info tab with plain-English notes on CoC, hyperfocal, 500 vs NPF, and a sensor crop-factor reference

HOW IT WORKS

Pick your sensor preset (or build a custom one) and set the focal length with the field or a chip.

The app derives your crop factor and circle of confusion automatically.

Enter an aperture and, for DOF, a focus distance.

Read the sharp range, hyperfocal point, and star limits — and copy anything you need.

Save the sensor-and-focal pairs you shoot most to the profile carousel and switch between them in a single tap.

PERFECT FOR

• Landscape photographers chasing front-to-infinity sharpness
• Portrait and product shooters who need an exact depth of field
• Astrophotographers keeping stars as pinpoints, not trails
• Drone and phone shooters working with small, high-crop sensors

PRIVACY

Aperlux Photo Calc is built to work in the field. Every calculation runs on your device as pure local math — there is no account, no sign-up, no ads, and no tracking. Your settings and saved profiles stay on your phone, and the app is fully usable with no connection at all, whether you are deep in a canyon or in airplane mode under the stars.

Set your sensor. Know your sharpness. Download Aperlux Photo Calc and shoot with numbers you can trust.