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File:Photoelasticity - TDK Head Cleaner - Black background.jpg

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English: TDK tape head cleaner cassette "HCL-11" made of clear hard plastic. The plastic is birefringent and demonstrates internal stress as coloured patterns (photoelasticity) when photographed using cross polarisation. The polarising light source (an LCD monitor) has been rotated such that the polarising filter on the lens is oppositely oriented and so cuts out all the direct light, leaving a black background.
Polski: Kaseta do czyszczenia głowic magnetofonowych wykonana z przezroczystego, twardego tworzywa sztucznego. Tworzywo jest materiałem dwójłomnym i dzięki zjawisku fotoelastyczności pokazuje naprężenia wewnętrzne w postaci kolorowych wzorów, gdy jest fotografowane z użyciem polaryzacji krzyżowej (obiekt umieszcza się między dwoma polaryzatorami odpowiednio ustawionymi względem siebie). Tutaj źródło światła spolaryzowanego (monitor LCD) zostało obrócone w ten sposób, że filtr polaryzacyjny na obiektywie jest zorientowany w przeciwnym kierunku i odcina całe padjące na niego światło pozostawiając czarne tło.
Čeština: Magnetofonová kazeta s páskou na čištění magnetofonových hlav fotografovaná v polarizovaném světle.
Español: Un casete limpiador de cabezales de cinta hecho de plástico duro transparente. El plástico es birrefringente y muestra tensión interna como patrones coloreados (fotoelasticidad) cuando se fotografía utilizando polarización cruzada. La fuente de luz polarizadora (un monitor LCD) se ha girado de tal forma que el filtro de polarización de la lente está orientado de manera opuesta, por lo que corta toda la luz directa, produciendo un fondo negro.
Magyar: Kazettás magnó fejének tisztítására használt kazetta
(Keresztpolarizációs eljárással készült fénykép)
Македонски: Касета за чистење глави.
Nederlands: Een schoonmaakcassette, om de magneetkoppen van een cassetterecorder te reinigen
Português: Limpador de cabeças de fita cassete feito de plástico duro transparente e fotografado utilizando a técnica de polarização cruzada.
Tiếng Việt: Lau đầu băng cassette TDK "HCL-11" làm bằng nhựa cứng trong suốt.
Date
Source Own work
Author Colin
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White background.
See also the two images juxtaposed.
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© User:Colin / Wikimedia Commons / 
CC BY-SA-4.0
© User:Colin / Wikimedia Commons
Camera Model Sony A77 II
Shutter speed 1/2s
Aperture f/8
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 using the pyramid method. Dust removal with Photoshop and final adjustments using Lightroom.

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current14:10, 18 March 2017Thumbnail for version as of 14:10, 18 March 20175,542 × 3,690 (8.15 MB)Colin (talk | contribs)User created page with UploadWizard

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