Photography guides
Plain-language guides to the ideas behind the calculators - with links to the tool for each one.
Depth of Field Explained: A Complete GuideWhat depth of field is, what controls it, and how to get exactly the amount you want.Hyperfocal Distance ExplainedThe focusing trick that gives landscapes sharpness from the foreground all the way to the horizon.Crop Factor Explained: Full Frame vs APS-C vs Micro Four ThirdsWhat crop factor means, how to convert focal lengths, and why equivalence does not change exposure.ND Filters Explained: Stops, Long Exposures and StackingHow neutral density filters work, what the numbers mean, and how to nail long-exposure shots.The 500 Rule for AstrophotographyHow to keep stars sharp in a nightscape, and when to switch to the stricter 300 or NPF rules.Golden Hour Photography GuideWhen the best light happens, how long it lasts, and how to plan a shoot around it.