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Camera Lens

Transcript: Camera Lens By Mok Kai Yin 20156725 Yashita Sharma 20152391 Luo Hao 2015786 What are lenses? Introduction A curved piece of glass, plastic, or other transparent material, used in cameras, glasses, and scientific equipment, that makes objects seem closer, larger, smaller, etc. Definition by Cambridge Dictionary How lenses work? Lens Optics Kinds of lenses Two main kinds Concave Convex Lens Prime lens → Fixed focal length Zoom lens → Range of focal lengths Aspherical lens → Corrects spherical aberration Crown and flint glass → Corrects chromatic aberration Materials used 1. Optical glass - Most commonly used 2. Optical plastic - Refraction index depends on degree of polymerization Resin - Not as popular due to many disadvantages Materials Rays 1. Meridional 2. Paraxial 3. Skew - never intersects lens axis Rays Development What happen with lenses and cameras? Dallmeyer Rapid Rectilinear Produced in 1866-1890 John Henry Dallmeyer 1866-1890 Dallmeyer Rapid Rectilinear Design Post world war 2 Lenses were massively required in the film industry. Propaganda Post WWII Camera Now Digital single lens reflex cameras (DSLR) Lens design Design Nowadays How Lens design is analyzed by computer E.g. OpticalSoftware.NET Skew ray tracing up to 50 billion times faster Companies Who Canon Nikon Sony etc... What kind of lenses? Fisheye <14mm Wide angle 14mm - 35mm Standard 35mm - 85mm Short telephoto 85mm - 135mm Medium telephoto >135mm Super telephoto >300mm What Application of cameras Application Photograph Take photos : Phone lens Recording : video camera Living use Microscope Observe small objects and cells Science use Lab automation A more efficiency system to provide lower overall cost Medical endoscope camera Medical Use Nuclear imaging To visualize the surgery or diagnostic procedure on a larger screen Enables visualization of organ and tissue structure as well as function Conclusion Conclusion Camera lens has make a great contribution in the human history, in science and art. After the long development of camera lens, it can be used in the multiple ways and cannot separate whit human's basic life. Q&A MLA Citations Barreto, Joao, et al. "Automatic camera calibration applied to medical endoscopy." BMVC 2009-20th British Machine Vision Conference. The British Machine Vision Association (BMVA), 2009. “Lens.” Cambridge Dictionary, 2021, Kingslake, Rudolf, and Barry Johnson. Lens design fundamentals. academic press, 2009. Kingslake, Rudolf. A history of the photographic lens. Academic Press, 1989. Works Cited

camera lens

Transcript: The book that i got from the library didn't help me as much as i thought it would the information in the book was still very good and i was able to use some but it was not really was i was looking for this book/source was still reliable My self emailed canon asking about their supply chain and where they got there materials from. They replied with a email that did not really help my case of how are cameras and made and where they get there materials from overall they were very reliable but didn't give me the information that i needed Johann Zahn designed the first camera in 1685. But the first photograph was clicked by Joseph Nicephore Niepce in the year 1814. Richard Leach Maddox invented the gelatin dry plate silver bromide process, which made it possible to take a picture and develop it later by Ben Turner camera lens how it is made 1. mix glass powder 2. melt power to liquid 3. squeeze large sheet of glass into a strip 4. cut small squares of glass 5. place squares in mold and melt 6. polish glass 7. assemble lens body with glass indside How cameras connect the world Bibliography Book how cameras are made Glass how the lens are made Bibliography nano crystal coating is made up of small particles that coat the side of the lens and are made in japan The sand is taken from local beaches in japan they are then taken and heated to a temperature of 3,200 degrees Fahrenheit. Then it is shaped/molded into they shape that they need it be in is then sent to the factories in japan Nano crystal coating Most of the factories are in japan this is were the materials to make them are sent they are then crafted here into proper lens. Then they are shipped from the factories to shops all a cross the world the main places they are shipped to are Australia, USA, Germany and New Zeland. My self i thought this website was very reliable it has books that it has written proving that the information that they showcase to people who are looking at the website will get the correct information and after researching the information to double check that is was all right it was and this means that this website was truly right direct email to canon introduction plastic starts in a chemical facility in the USA as feedstocks that are processed into polymers. Many polymers are then shaped into small pellets that can be shipped all over the country to be made into plastic that are used in creating camera lens they are then shipped to the factories Bibliography cameras connect the world by letting people take photos of were they are and send them to family, friends or post it on social media creating amazing and unique pictures for the world to see. Cameras have changed the world as we now it they were extremly hard to make as the creators found out cameras are build into everything these days phones etc they have made different types of lens to make it so you can zoom in from different distances and take mind blowing photos that will forever change how you and your friends and family look at the world this could be a photo of a bird flying or a car just before a accident or a very amazing moment in sport where are the factories located Plastic The Products

Camera Lens Optics

Transcript: Camera Lens USes Can be used by anybody on special occasions or on a daily basis to capture memories taking pictures capture moments recreate images permanent memory record history art (photography) news source Photography is undoubtedly one of the most important and useful inventions created. It has altered how people perceive the world. We can now easily "see" things that are in fact many miles, and years away from us. Photography gives us the opportunity to capture moments in time and keep them for many years to come. Fun Facts Cameras originally captured images on light sensitive material, later known as film, in a black and white format, but in the late 1800s a chemical process involving dyes was invented so cameras could capture coloured images, using coloured film. The first cassette containing 12 sheets of light sensitive paper weighed 15 pounds Camera obscura is used up to this day for production of integrated circuits and a special film camera History Shutter: -It is a thin sheet covering the CCD - When the shutter opens, it exposes light from the exterior onto the film, allowing a picture to be taken. -The longer the shutter it is open, the greater the amount of light that is allowed into the camera. -The shutter speed is simply the length of time that the light hits the film or sensor allowing the image to be recorded. Charge-coupled device (CCD): Convex lens (optical component): 2.5 Billion people own a camera advances in technology in digital cameras and photo-processing results in growth in the photography industry -It directs light to the viewfinder from the object economic Benefits -Digital cameras have a CCD which is used as a film. It is a light-sensitive circuit that stores and displays the data for an image to occur, converting the image into an electrical charge. Pentaprism BY: NEta, Taylor, ITa -the beam of light from an object passes through a convex lens while being redirected due to refraction so that the light rays come together (converge), forming an upside down real image -If the light rays do not converge directly on the reflective surface, the image will be blurry, if the lens gets adjusted/moved, you can line up the focused real image of an object so it falls directly on the film surface.

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