8 calculators in this category
- Depth of Field CalculatorCircle of confusion by the sensor-diagonal ÷ 1500 conventionDepth of field is the zone in front of and behind your focus point that still looks acceptably sharp. It is set by four things…
- Hyperfocal Distance CalculatorCircle of confusion = sensor diagonal ÷ 1500 (classic convention)Focus a lens at its hyperfocal distance and everything from half that distance out to infinity records as acceptably sharp. It…
- Crop Factor & Equivalent Focal Length Calculator35 mm film frame (36 × 24 mm, 43.27 mm diagonal) as the reference formatCrop factor is the ratio of two sensor diagonals, and it converts any lens on any camera into the focal length that would frame…
- ND Filter Long Exposure Time CalculatorOptical density D = log₁₀(1/T); Schwarzschild reciprocity exponentA neutral density filter removes a known number of stops of light, and every stop doubles the exposure time. That is the whole…
- Print Size, DPI & Enlargement Calculator1 arcminute visual acuity (Snellen 20/20) for the viewing-distance limitPrint resolution is one division: pixels divided by inches. This calculator runs it in both directions — the largest print your…
- Camera Field of View & Subject Coverage CalculatorThin-lens (Gaussian) opticsAngle of view depends on two numbers and nothing else: the focal length of the lens and the physical size of the sensor behind…
- Astrophotography 500 Rule & NPF Shutter Calculator500 rule and NPF rule (Michaud)The stars move at about 15 arcseconds a second, so every untracked night shot is a race between collecting light and smearing…
- Timelapse Interval & Clip Length CalculatorA timelapse is governed by one identity: frames equal clip length times frame rate, and shooting time equals frames times…
Which one do you need?
- Depth of Field Calculator
- Find the near and far limits of sharp focus for any focal length, aperture, distance and sensor format, with hyperfocal distance and the circle of confusion.
- Hyperfocal Distance Calculator
- Find the hyperfocal distance for any focal length, aperture and sensor size, plus the near sharp limit and the f-stop you need for a chosen foreground.
- Crop Factor & Equivalent Focal Length Calculator
- Compare lenses across sensor formats: crop factor from the sensor diagonal, 35 mm equivalent focal length, equivalent aperture and ISO, and the angle of view.
- ND Filter Long Exposure Time Calculator
- Convert a metered exposure into the shutter speed you need behind any neutral density filter. Works in stops, ND numbers or density, and stacks filters.
- Print Size, DPI & Enlargement Calculator
- Convert pixel dimensions into maximum print size at any DPI, or find the resolution and upscaling a target print size needs. Plus a viewing-distance check.
- Camera Field of View & Subject Coverage Calculator
- Compute horizontal, vertical and diagonal angle of view for any lens and sensor, plus how wide the frame covers at a distance and the focal length you need.
- Astrophotography 500 Rule & NPF Shutter Calculator
- Find the longest shutter that keeps stars as points for your lens and sensor with the 500 rule, and check it against the stricter pixel-based NPF rule.
- Timelapse Interval & Clip Length Calculator
- Solve any of interval, shooting time or finished clip length for a timelapse, and get the frame count, speed-up factor and card space the sequence needs.
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