Questions tagged “guide number”

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

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337

What do the distance markings on a Vivitar 273 flash dial mean in auto-thyristor mode?

guide-numberfilm-photographyauto-thyristorflashvivitar

Alana Storm

2mo ago

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2

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304

Can a smartphone LED “flash” be described with a guide number?

lightingguide-numberflashsmartphone-photographyexposure

Photography Stack Exchange contributor

4y ago

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111

Is the Pentax KP built-in flash much weaker than the K-7's?

kpk-7built-in-flashguide-numberpentax

Photography Stack Exchange contributor

5y ago

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2

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155

Does flash guide number still follow the inverse-square law at very long distances?

distancelightingguide-numberflashexposure

Photography Stack Exchange contributor

7y ago

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216

Why doesn’t shutter speed appear in the manual flash guide number formula?

guide-numbershutter-speedflashexposuremanual-flash

Photography Stack Exchange contributor

7y ago

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281

How does a flash head’s zoom setting theoretically affect guide number?

lightingspeedlightguide-numberflashzoom

Photography Stack Exchange contributor

7y ago

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245

For shallow-DOF off-camera flash, is 1/32 minimum power enough or do I need 1/128?

guide-numberoff-camera-flashflashexposuremanual-flash

Photography Stack Exchange contributor

7y ago

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2

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307

Guide number of the Godox V860II at different zoom settings

lightingspeedlightguide-numbergodoxflash

Photography Stack Exchange contributor

8y ago

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173

Does a flash guide number apply to a bare flash or when using a softbox?

lightingspeedlightguide-numberflashsoftbox

Photography Stack Exchange contributor

8y ago

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371

Why does a flash guide number change with the head zoom setting?

lightingspeedlightguide-numberbeginnerflash

Photography Stack Exchange contributor

10y ago

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184

How much more light do two speedlights add in one softbox?

lightingspeedlightguide-numberoff-camera-flashflash

Photography Stack Exchange contributor

10y ago

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2

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275

Why doesn’t the guide number calculation seem to match the inverse-square law in flash exposure?

apertureguide-numberinverse-square-lawflashexposure

Photography Stack Exchange contributor

10y ago

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2

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134

How can I keep direct flash from overpowering a night scene without lots of trial and error?

fill-flashnight-photographyguide-numberflashexposure

Photography Stack Exchange contributor

11y ago

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245

Does a flash guide number or range include ambient light, and does it change indoors vs outdoors?

lightingguide-numberoff-camera-flashflashportraits

Photography Stack Exchange contributor

11y ago

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229

What do the green numbers 28, 20, and 14 mean on a Canonet QL19 aperture ring?

apertureguide-numbercanonetrangefinderflash

Photography Stack Exchange contributor

12y ago

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2

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201

What flash guide number is needed to keep a sunny-day subject properly exposed while darkening the background by 2 stops?

fill-flashguide-numberoutdoor-lightingflashexposure

Photography Stack Exchange contributor

13y ago

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2

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255

How do I work out the guide number of an old flash at ISO 100?

lightingguide-numbervintage-gearflash

Photography Stack Exchange contributor

14y ago

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402

How does flash guide number change when you reduce flash power?

lightingguide-numberisoflashexposure

Photography Stack Exchange contributor

15y ago

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295

How does flash guide number change with ISO?

lightingguide-numberisoflashexposure

Photography Stack Exchange contributor

15y ago

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206

Do multiple strobes add their power, and are there diminishing returns?

lightingguide-numberstrobesoff-camera-flashflash

Photography Stack Exchange contributor

15y ago

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