Questions tagged “optics”

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

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2

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350

How do you measure the true f-number of a lens when the aperture is behind lens elements?

f-stopleaf-shutterlensesapertureoptics

Peter M

1mo ago

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2

answers

320

How were early CinemaScope anamorphic lenses designed, and how did later anamorphic systems differ?

anamorphiclensescinematographycinemascopeoptics

uhoh

1y ago

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2

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1423

What is the thin-lens equation, and how is it useful in photography?

lensesopticsphotography-basicsfocusfocal-length

Tom Axford

1y ago

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2

answers

276

Could a wide-angle lens plus magnifier create a telephoto image with wide-angle depth of field?

depth-of-fieldlens-designopticstelephototeleconverter

Flux

1y ago

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2

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553

What is the centre of perspective in a photograph, and why does it matter?

theoryperspectivecompositionlensesoptics

Tom Axford

1y ago

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2

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467

What does “18x” mean on a clip-on smartphone telephoto lens?

magnificationlensesopticstelephotosmartphone-photography

Orion's Belt

1y ago

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2

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298

Why does a fisheye lens keep a rainbow circular instead of distorting it?

lens-distortionrainbowfisheyewide-angleoptics

summerrain

1y ago

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2

answers

1212

How are object distance, image distance, and focal length related in a lens?

lensesimage-formationopticsfocusfocal-length

Bram

1y ago

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2

answers

253

What’s the difference between working distance, minimum focus distance, and infinity focus on a machine-vision lens?

lensesmachine-visionopticsfocus-distanceinfinity-focus

Aravind D. Chakravarti

2y ago

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2

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1479

Does focal length change perspective, or only camera position?

macroperspectiveopticsthin-lensfocal-length

cosaty

2y ago

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2

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218

Does sensor or format size affect depth of field, or only the image formed by the lens?

depth-of-fieldcircle-of-confusionopticsdepth-of-focussensor-size

Oldhouse

2y ago

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2

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299

Why is viewing the Sun through a telescope dangerous if a telescope can't increase surface brightness?

solar-photographyeye-safetytelescopesopticsphysics

Photography Stack Exchange contributor

2y ago

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votes

2

answers

232

How do you choose circle of confusion for depth of field on a 16K line-scan camera?

depth-of-fieldindustrial-imagingline-scan-cameracircle-of-confusionoptics

Photography Stack Exchange contributor

2y ago

0

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2

answers

659

What is optical vignetting, and why does stopping down reduce it?

lens-designaperturebokehvignettingoptics

Photography Stack Exchange contributor

2y ago

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2

answers

342

Why are telephoto lens designs usually used for long focal lengths, not short ones?

lens-designwide-angleopticstelephotofocal-length

Photography Stack Exchange contributor

2y ago

0

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2

answers

233

Can a 50mm lens image a 3mm object full-frame on a 5.2×3.9mm sensor, and are my distance calculations correct?

magnificationmacrolensesmachine-visionoptics

Photography Stack Exchange contributor

3y ago

0

votes

2

answers

182

Is depth of focus symmetrical, and is my depth-of-field diagram correct?

depth-of-fieldopticsdepth-of-focusfocusthin-lens

Photography Stack Exchange contributor

3y ago

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votes

2

answers

243

Why don’t 25mm at f/4 and 100mm at f/16 give the same depth of field at the same subject distance?

depth-of-fieldaperturecircle-of-confusionopticsfocal-length

Photography Stack Exchange contributor

3y ago

0

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2

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259

Does the inverse square law apply to light passing through a lens?

lensesopticsinverse-square-lawlight-lossexposure

Photography Stack Exchange contributor

3y ago

0

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2

answers

235

How does changing image distance affect resolution when adapting a scanner lens to a Raspberry Pi camera?

raspberry-pi-cameraimage-distanceresolutionlens-adaptationoptics

Photography Stack Exchange contributor

3y ago

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