Tele Vue Optics: Imaging Methods
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Choosing a Lens for the 1 Beyond StreamCam
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Camera Lens Focal Length Calculator | Lens EFL Calculator
Focal length - Wikipedia
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Projection Calculator Pro - Projector to Screen Distance
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Smartphone Projector Calculator | Your DIY Smartphone Projector Guide
How to Calculate the New MFD of a Lens When Using an Extension Tube
Focal Length Calculator | Edmund Optics
How to Find the Working Distance of Any Lens for Custom Camera Mounting
How do I select a projector lens? | EIKI Projectors
Lens focal length calculator
Lenses | Science Calculators
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Derksen Lichttechnik GmbH Projection Calculator - Derksen Lichttechnik - for PHOS projectors
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How To Calculate A Lens' Focal Length : Slightly Simplified - Light And Matter
Photography 101 - Lenses, Light and Magnification
