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Members of the World Beat drumming group trace how traditional African music traveled the United States and influenced jazz and rock and roll music
So here's how it works:
> Turning the aperture ring raises the "Diaphragm Bar" behind the lens. At f/2.8 it's completely below the lens opening, and at f/22 it's just below the lens centerline.
> When the mirror rises, it drags this panel up with it; the odd shaped hole in the middle is the shutter opening. The mirror/shutter rises just as fast as its spring can whack it, and returns at the same speed as soon as it reaches the top.
> At f/2.8, the shutter is open for the entire distance of travel shown in green above - it takes about 1/60 second to cover this distance. But at f/22, with the DIaphragm Bar up where the purple line indicates, the shutter doesn't open until it reaches that line, and it closes as soon as it passes that line on the way down. The entire movement takes the same time as before, but the open time is only the time that it takes to travel the distance shown by the purple arrows. Assuming that the speed at f/2.8 was 1/60, this works out to about 1/500 second.
> The aperture at f/22 (and at all other settings except for f/2.8) is in the shape of a triangle with its point at the top - the top 2 sides are the edges of the "roof" part of the shutter opening, and the bottom side is provided by the Diaphragm bar.
It's actually just a little more complicated than this. In the above description, the f/22 opening is not centered on the same axis as the f/2.8 opening, and in fact if the Diaphragm Bar actually went as high as the purple line it would block off the center of the lens. So, in addition to all of the above, at the smaller apertures, the mirror/shutter is actually stopping its upward travel earlier than it does at full aperture. How does it do this? In the view of the Diaphragm Bar at www.flickr.com/photos/rick_oleson/53225547915/in/dateposted/, there is a second, gold colored bar that's coupled to the Diaphragm Bar, with a bent-up tab at its tip. As the Diaphragm Bar rises, this gold bar comes down - the tab at the end is the stop that the mirror strikes against to stop its upward travel. The two bars are coupled together so that the mirror's stopping position produces a centered triangular aperture opening at all settings. Dang.
Whoever did this will probably never be famous - but he was good.
The Recreation program office is located in the Annex Building, located at the end of Loop Road below the Undergraduate Building. Here, you can sign up for fun trips and workshops and rent equipment for an outdoor adventure.
Photo: Laura Dutelle
The van for the SFPD's teen fishing program, a Ford Transit Connect, (i think...) sits at an (you guessed it...) expired parking meter, waiting for the return of the participants from a fishing trip, in the Fisherman's Wharf area of San Francisco, CA. Taken by a Nikon D40x with a Nikon 18-55mm VR kit lens (at 18)
Canadian Army Sergeant Major, Chief Warrant Officer Alain Guimond, talks with members of the National Sentry Program about the the tasking they are on before they take their post at the national War Monument in Ottawa, Ontario on 1 November 2017.
Photo: Sgt D.G. Janes
Directorate of Army Public Affairs
Programa del Salón del Cómic: Avándaro, la historia jamás contada, en la XXXII Feria Internacional del libro en Guadalajara, México. Participa: Luis Fernando. Sábado 01 de diciembre del 2018. ( © FIL/NABIL QUINTERO MILIÁN)
The Twenty-Ninth of WIPO’s Program and Budget Committee (PBC) took place in Geneva from May 6 to May 10, 2019.
Copyright: WIPO. Photo: Emmanuel Berrod. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 IGO License.
Hudson Yards is a large-scale redevelopment program planned, funded and constructed under a set of agreements among the State of New York, New York City, and the Metropolitan Transportation Authority, with the aim of expanding New York City's Midtown Manhattan Business District westward to the Hudson River. The program includes a major rezoning of the Far West Side.
The centerpiece of Hudson Yards is a 28-acre (11 ha) mixed-use real estate development of the same name by Related Companies and Oxford Properties, currently being built over the West Side Rail Yard. According to its master plan, created by Kohn Pedersen Fox Associates, Hudson Yards is to consist of 16 skyscrapers containing more than 12,700,000 square feet (1,180,000 m2) of new office, residential, and retail space. Among its components will be six million square feet (560,000 m2) of commercial office space, a 750,000-square-foot (70,000 m2) retail center with two levels of restaurants, cafes, markets and bars, a hotel, a cultural space, about 5,000 residences, a 750-seat school, and 14 acres (5.7 ha) of public open space. The railyard project broke ground on December 4, 2012; the first tower, an 895-foot (273 m) office building in the southeast corner of the site, opened on May 31, 2016. Hudson Yards will accommodate a projected 65,000 daily visitors when completed. At over-US$20 billion, it is the most expensive development project in history.
Commander Ray Leung's change of command, taking over as commanding officer of The World Famous SCREWTOPS from exiting Commander Mark Seip.
(I asked, and the "World Famous" designation was given many years ago and few others have the title. Pretty cool.)
On April 22, 14 girls and two coaches from Brazil who are a part of "Las Estrellas," a sports, leadership and English program, came to Knoxville, TN as part of the U.S. Department of State Empowering Women and Girls through Sports Initiative. After the first day, they had already experienced University culture by participating in Dr. Ashleigh Huffman's Service-Learning class and eating in the cafeteria.
The School Lunch program at Dindi school increased school attendance and gave the students energy to learn. School lunches were largely made possible by the contributions of maize made by Mwandama farmers to grain banks.
ELYSIAN PARK - With the Los Angeles Fire Department's training center as a backdrop, graduates of the Firefighter/EMS Magnet (FEMS) program at Woodrow Wilson High School in El Sereno were honored by civic leaders and LAFD leadership at a May 25, 2019 ceremony capped with a skills demonstration as their families cheered their accomplishment. One of four youth programs supported by the LAFD, FEMS provides a highly structured and progressive pathway for achieving academic, physical and life skills beneficial to a fire service career, including teamwork, leadership, courage and commitment.
LAFD Event: 052519 - Wilson High School FEMS Graduation
Photo Use Permitted via Creative Commons - Credit: LAFD Photo | Gary Apodaca
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Foto Emerson Díaz. Presentación do programa infantil e xuvenil do Culturgal 2010 a cargo de Xulio Amigo e Eva Mejuto no conservatorio Manuel Quiroga, Pontevedra.
Leon and I entered the Internal Functional Programming Competition this year, he also wrote some visualisation software so we could see our bot in action.
Blue = cops, Red = robber, Green = our "infocloud" - Click on all sizes to see it animated.
Student volunteers from Thomas Nelson Community College biology classes spend their Saturday morning participating in International Coastal Cleanup day at Dandy Haven Marine in Hampton, VA on Oct 19, 2019.
Virginia Institute of Marine Science's Marine Advisory Program and Virginia Sea Grant are proud partners in the Virginia Clean Marina Program, which recognizes marinas that voluntarily take measures to prevent or reduce pollution at their facilities.
(Photo by Aileen Devlin | Virginia Sea Grant)