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Crop Factor Calculator
Documentation — Depth of Field Calculator & Comparison Tool
Lens equivalent calculator by Daniel Mlodzikowski
Equivalence Also Includes Aperture and ISO
DSLR Crop Factor conversion chart - what "lens" you actually shoot with when you're still too poor for a full… | Crop factor, Manual photography, Photography basics
Focal Length Calculator by Nitrio
What is equivalence and why should I care?: Digital Photography Review
mmCalc v2.0 Released - Crop factor calculator website and app - mirrorlessrumors
Canon Knowledge Base - 35mm-equivalent focal length
4x5 Lenses - Choosing the Best Focal Length — Alex Burke Photography
Crop factors explained - Photo Review
mmCalc on the App Store
The Crop Factor Unmasked - Articles and Tips | PentaxForums.com (Mobile)