Questions tagged “lens theory”

Ask the Unique Photo creator community — gear, technique, post-processing and more.

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Where is an image sharpest within depth of field?

lens-theorydepth-of-fieldopticssharpnessfocus

Photography Stack Exchange contributor

6y ago

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149

Do internal-focusing macro lenses keep their maximum aperture at close focus?

lens-theorymagnificationmacroapertureinternal-focusing

Photography Stack Exchange contributor

8y ago

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133

How is focal length defined for a 180° fisheye lens?

lens-theoryfield-of-viewfisheyeopticsfocal-length

Photography Stack Exchange contributor

9y ago

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211

Does doubling focal length really make the image look twice as large?

lens-theorymagnificationfield-of-viewwide-anglefocal-length

Photography Stack Exchange contributor

9y ago

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343

How do the f-number formulas f/D and 1/(2NA) relate, and why does NA suggest a limit near f/0.5?

lens-theoryaperturef-numberopticsnumerical-aperture

Photography Stack Exchange contributor

10y ago

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135

Why do f-stops change by square roots instead of a linear scale?

f-stoplens-theoryaperturebasicsexposure

Photography Stack Exchange contributor

12y ago

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109

Does effective f-number reduce image brightness at close focus?

lens-theorymacroapertureeffective-f-numberexposure

Photography Stack Exchange contributor

13y ago

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80

Can a camera lens make a scene look brighter than viewing it with the naked eye?

lens-theoryapertureviewfinderbrightnessoptics

Photography Stack Exchange contributor

13y ago

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114

How do you calculate magnification when reverse-mounting a lens?

lens-theorymagnificationmacroreverse-lens

Photography Stack Exchange contributor

14y ago

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155

Does close focusing or focus breathing reduce a lens’s effective aperture?

lens-theorymacroaperturefocus-breathingclose-up

Photography Stack Exchange contributor

15y ago