File:Distance times fstop.jpg

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Original file (2,722 × 2,358 pixels, file size: 2.43 MB, MIME type: image/jpeg)

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Summary

Description
English: The illuminating power of electronic photoflash devices are often measured as guide numbers, which are a composite unit of measure comprising two factors: aperture ratio and distance. Guide numbers may be expressed in either of these units of measure: f-number⋅meters or f-number⋅feet.

Camera: Nikon-Df
Saved file type: 14-bit RAW
Lens: Micro-NIKKOR 55mm f/3.5 macro
Filter: B+W 52mm HTC Kaesemann Circular Polarizer
Scene illuminance: EV 9 (1280 lux)
Aperture: f/22
Shutter: 2 seconds
Sensitivity: ISO 200
Distance (mid): 7 inches
Lighting: Natural indirect plus LED photoflood with diffuser
Avg. diametric crop from original: 63%

Date
Source Own work
Author Greg L

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4 August 2017

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2955ea4e06d2e049d54298790e3f3e71b0228bf4

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Date/TimeThumbnailDimensionsUserComment
current02:38, 14 August 2017Thumbnail for version as of 02:38, 14 August 20172,722 × 2,358 (2.43 MB)wikimediacommons>Greg LColor balance more blue

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