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## Notes by Dr. Optoglass: The F-numbers of the Eye

Topics Covered: Typical F-numbers for various scenarios How to find f-stop T-stop The F-numbers of the Eye If I could steal someone’s dream myself, I’d have to go for one of Orson Welles – Christopher Nolan We have all the formulas we need to calculate f-numbers at various ISOs based on lux levels. Here is […]

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## Notes by Dr. Optoglass: How to Read Light for Exposure

Topics Covered: Light meter – Incident and Reflective Lux, EV and Common Scenarios The Inverse Square Law Art is never finished, only abandoned – Leonardo da Vinci Now that we know what an exposure is, we are ready to measure it. There are two ways in which to do this: Using an incident light meter […]

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## Notes by Dr. Optoglass: Camera Exposure

Topics Covered: Exposure and Camera Exposure Exposure Value (EV) and Stops F-number and Shutter speeds Look and think before opening the shutter. The heart and mind are the true lens of the camera – Yousuf Karsh This is how a camera works: The sensor is a jar that can take in light till a certain […]

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## Notes by Dr. Optoglass: The Megapixel Counts of the Human Eye

Topics Covered: The Megapixel Count of the Human Eye Rule of Thirds? Whenever I arrive on a real location, I have to move around and work out what the best angles are going to be. When I was moving around with the lens, I discovered things that the naked eye would not have – Pedro […]

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## Notes by Dr. Optoglass: Airy Disk and Pixel Density of the Human Eye

Topics Covered: The Airy Disk Diffraction Pixel size of the Eye Pixel density or resolution of the Eye Everybody thinks they know what art should be. But very few of them have the sense that is necessary to experience painting, that is the sense of sight, that sees colors and forms as living reality in […]

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## Notes by Dr. Optoglass: The Resolution of the Human Eye

Topics Covered: The average and maximum resolutions of the human eye PPI and DPI at various distances Beauty is all very well at first sight; but who ever looks at it when it has been in the house three days? – George Bernard Shaw Exclusive Bonus: Download my free cheatsheet (with examples) of the most […]

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## Notes by Dr. Optoglass: Focal Lengths of the Human Eye

Topics Covered: The many focal lengths of the eye The focal length of the eye in photographical terms Nature will bear the closest inspection. She invites us to lay our eye level with her smallest leaf, and take an insect view of its plain – Henry David Thoreau Before you get the wrong impression, let’s […]

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## Notes by Dr. Optoglass: Angle of View and Aspect Ratio

Topics Covered: The Angle of View of the Eye The Sensor Size of the Eye The Aspect Ratio of the Eye The Crop Factor (35mm equivalent) of the Eye The eye of the master will do more work than both his hands – Benjamin Franklin Put together, the horizontal angle of view of both eyes […]

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## Notes by Dr. Optoglass: Eye Geometry

Topics Covered: The Emsley model of the Eye The Focal Length the Eye The Total Retinal Area of the Eye The health of the eye seems to demand a horizon. We are never tired, so long as we can see far enough – Ralph Waldo Emerson The problem with drawing the geometry of the human […]