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Pinhole Photography for the DSLR Scott Hull GSFC Photo Club 4/20/2011

Pinhole Photography for the DSLR

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Pinhole Photography for the DSLR. Scott Hull GSFC Photo Club 4/20/2011. History. Also known as a camera obscura Effect described as early as 5 th century BC Aristotle, Bacon, and da Vinci all studied it Initially a room, with the image projected on a wall - PowerPoint PPT Presentation

Text of Pinhole Photography for the DSLR

  • Pinhole Photography for the DSLRScott HullGSFC Photo Club4/20/2011

  • HistoryAlso known as a camera obscuraEffect described as early as 5th century BCAristotle, Bacon, and da Vinci all studied itInitially a room, with the image projected on a wallPortable versions with projection screens for drawingFirst known pinhole photograph in 1850Popular mostly in late 19th centuryRevived in the 1960s for artistic purposesHas been used in spacecraft for X-ray imaging

  • Basic Idea

  • ResourcesCamerasMany are homemadeCommercial cameras are availableModifications for the DSLRPhotographic MediumFilmPhotographic paperCCDInformationDozens of web sitesVery big in the UK

  • Making the Aperture (1)MaterialsAluminum canAluminum foilBrass shim stockPunchNeedle or pinMounted in a pencil eraserCan be sharpened with sandpaperTechniqueThin the stock to weaken it, and provide better opticsPunch and twist, to get a round holeSand any burrs flat

  • Making the Aperture (2) http://www.alscotts.com/techniques/pinhole/

  • Practical AspectsDSLR makes things much easierLight meterHigh ISO values available for short exposuresFilm is cheapUse a tripod for long exposuresDust on the sensor is a big problemRemove with a low pressure puff of air (dont blow it!)Consider movement - blurringUsually not desirableCan be an interesting effect

  • My Examples0.16 mm aperture

  • Theoretical Optimum Hole SizeR = 0.95 ( d)R = radius of the hole = wavelength (550 nm average)d = focal distance (usually 50 mm)For most DSLRs, then R = 0.157 mm (hole diameter = 0.315 mm)Aperture: f = d/2R = f 159

  • Actual OptimizationSmaller is betterRoundness is criticalFlatness is important

    Stock thickness has an effect as wellThinner is betterWider field of view with thinner stockvs.

  • Others Examples

  • More Examples

  • Extreme ExampleSIX MONTH exposure onto photo paperNotice the lines traced by the sun as it crossed the sky day after day, after dayhttp://www.geardiary.com/2010/07/28/photographer-uses-soda-can-camera-to-capture-6-month-long-exposure/

  • Worldwide Pinhole Photography Dayhttp://www.pinholeday.org/Last Sunday in April every yearApril 23 to May 1 this year, because of EasterTake as many images as you want, but only submit oneSubmit photos as a part of the Goddard Photo Club workshop: "NASA/Goddard:Greenbelt"