![Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius](https://www.rp-photonics.com/img/focal_length.png)
Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
DoF Calculator with Macro & Focus Stacking modes!: Macro and Still Life Photography Forum: Digital Photography Review
![macro - How can the focal length for shake reduction be determined when the lens is mounted using a reverse lens adapter? - Photography Stack Exchange macro - How can the focal length for shake reduction be determined when the lens is mounted using a reverse lens adapter? - Photography Stack Exchange](https://i.stack.imgur.com/YjO2s.png)