File:Photoelasticity - Clear CD case centre.jpg

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Original file ‎(3,906 × 3,906 pixels, file size: 4.26 MB, MIME type: image/jpeg)

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Summary

Description
English: The centre of a clear CD case. The plastic is birefringent and demonstrates internal stress as coloured patterns (photoelasticity) when photographed using cross polarisation. The vertical black line at the bottom is a small crack that developed when the CD was removed from the case.
Date
Source Own work
Author Colin
Attribution
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InfoField
© User:Colin / Wikimedia Commons / 
CC BY-SA-4.0
© User:Colin / Wikimedia Commons
Camera Model Sony A77 II
Shutter speed 1/3s
Aperture f/5.6
Film speed (ISO) 100
Lens Sony DT 2.8/30 Macro SAM
Filter(s) Circular polariser
Flash LCD display providing white polarised light
Support Benro C1282TV1 Travel Angel II tripod
Notes Focus stack of 6 frame combined using Helicon Focus. Final adjustments using Lightroom.

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inception

12 March 2017

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Date/TimeThumbnailDimensionsUserComment
current18:35, 13 March 2017Thumbnail for version as of 18:35, 13 March 20173,906 × 3,906 (4.26 MB)ColinSpot removal
20:26, 12 March 2017Thumbnail for version as of 20:26, 12 March 20173,906 × 3,906 (4.27 MB)ColinUser created page with UploadWizard

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