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Photography

Photography. ACCT-AGD-6 : Students will explore digital imaging and multimedia. Written by Michael Simmons May 2010. History of Photography Quick Review. Camera Obscura Greek words: Camera – Room Obscura – Dark Room with a hole in the wall to draw pictures seen out side.

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Photography

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  1. Photography ACCT-AGD-6: Students will explore digital imaging and multimedia. Written by Michael Simmons May 2010

  2. History of PhotographyQuick Review • Camera Obscura • Greek words: • Camera – Room • Obscura – Dark • Room with a hole in the wall to draw pictures seen out side. • Upside down image

  3. History of Photography • 1827 - Joseph Niépce - metal plate covered with a chemical called bitumen (silver & chalk mixture) into a camera box • 8 Hours to expose the photograph

  4. 1839 - Louis Daguerre - Daguerreotypes – metal plate with the silver iodized substance made a latent image when exposed to a mercury vapor. Once the latent image was fixed with a warm salt solution the image would become visible. History of Photography

  5. History of Photography • 1839 - William Talbot - Instead of making positives on metal plates, Talbot made negatives on paper. • Negative - area most exposed to the light was the darkest • Positives (picture) - the area most exposed to the light was the brightest

  6. Digital Camera • Point and Shoot • SLR (dSLR) – Single Lens Reflex Canon PowerShot SX1 IS Nikon DS 90 dSLR

  7. Advantages of Point and Shoot • Compact size • Lighter weight • Pre-set setting (f-stop, shutter, ect.) • Price

  8. Disadvantages of Point and Shoot • Picture quality • Little to no control over setting (f-stop, shutter) • Smaller aperture range

  9. Advantages of dSLR • You are in control of the camera • Better picture quality • Faster than Point & Shoot • Lenses are attachable so you can expand your focal point an zoom further. • When you look through the viewfinder, you actually look through mirrors and the lens just like with a 35 mm camera

  10. Disadvantages of Point and Shoot • SLRs will be heavier • SLRs will cost more • Most point and shoots are easy to use • No movie mode • You must know about f-stop and shutter

  11. What is a mega pixel? • Mega Pixel refers to the camera resolution. • Pixel is the smallest unit in a raster image • Mega Pixel is 1 million pixels • The higher the number of mega pixels less pixelization when the image is enlarged and printed. (10 mega pixel is better than 5 mega pixel when images are to be printed)

  12. Recommended Resolutions http://cameras.about.com/od/photoprintingtips/a/resolution_tabl.htm

  13. Basic Parts of the SLR Camera • Aperture (f stop)– an opening to let in a controlled amount of light • Shutter - is a device that allows light to pass for a determined period of time • ISO – Film Speed – Semiconductor

  14. SLR and Aperture • Aperture - this refers to the size of the opening letting light into the camera sensor. A larger shutter opening lets in more light, and a smaller shutter opening lets in less light.

  15. Lens Opening (Aperture/F Stop) 1. The larger the opening, the greater amount of light that reaches the film. 2. The size of the lens opening is measured by f-stops. (The larger the f-stop, the smaller the opening ) 3. The f-stops are on next slide

  16. Aperture 2.8 4. 5.6 8 11 16 22

  17. SLR and Shutter Speed • Shutter Speed - refers to the speed at which the shutter opens and closes. This is measured in fractions of seconds. A slower shutter speed lets in more light, and a faster shutter speed lets in less light.

  18. SLR and Shutter Speed 1. The time for which film is exposed to light is controlled by the shutter speed. 2. The faster the shutter speed, the shorter the duration of film exposure, and the less light reaches the film. 3. A dimly lit subject requires a slower shutter speed than a brightly lit subject.

  19. SLR and Shutter Speed 4. The following are shutter speed settings: 5. Each setting represents a halving or doubling of light that reaches the film. For example, 1/8 allows light in for twice as much time as 1/15.

  20. SLR and ISO • ISO Setting (also referred to as 'Film Speed') - this represents the sensitivity of film to light. In a Digital SLR the ISO Settings stand for a change in the light sensitivity of the chip that takes the place of the film on the inside of the camera.

  21. Relationship between F-stop and Shutter Speed 1. The combination of these two controls determines how much light actually reaches the film. 2.Each designated f-stop or shutter speed doubles or halves the amount of light allowed in by the next designated f-stop or shutter speed.

  22. Relationship between F-stop and Shutter Speed Cont. • F11 lets in half as much light as f8, and twice as much as f16 • A shutter speed of 1/60 lets in light for half as much time as1/30, and twice as much time as 1/125 • Therefore, f-stop and shutter speed have a reciprocal relationship. If the shutter speed is slowed down ( to allow more light to reach the film), the f-stop must be closed down ( to let less light strike the film) to make an equivalent exposure.

  23. References • http://blog.colormailer.com/choose-between-slr-and-point-and-shoot-cameras/ • http://answers.yahoo.com/question/index?qid=20100419171913AAknZY7 • http://www.geometer.org/beginner/slr.html • http://en.wikipedia.org/wiki/Pixel#Megapixel • http://cameras.about.com/od/photoprintingtips/a/resolution_tabl.htm • http://www.ez-digital-photos.com/digital-photography-tips-fstopsdemystified.html • http://www.watertown.k12.ma.us/dept/fapa/pdf/photo_study_guide_part_1.pdf

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