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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 Revera and Reel Youth Age is More Film Project is an intergenerational partnership between Revera, a Canadian leader in seniors' accommodation, care and services, and Reel Youth, a charitable project that empowers youth to create engaging films about important social issues. The partnership was launched in 2013.
With 80 films to date, the program celebrates older Canadians through story-telling and film, with the added benefit of fostering new intergenerational relationships. The project aims to shed light on ageism, challenge the assumptions of aging and recognize the valuable contributions of older adults to society.
The Revera and Reel Youth Age is More Film Project is an intergenerational partnership between Revera, a Canadian leader in seniors' accommodation, care and services, and Reel Youth, a charitable project that empowers youth to create engaging films about important social issues. The partnership was launched in 2013.
With 80 films to date, the program celebrates older Canadians through story-telling and film, with the added benefit of fostering new intergenerational relationships. The project aims to shed light on ageism, challenge the assumptions of aging and recognize the valuable contributions of older adults to society.
Stencil for the graphic representation of Computer Programs
1960s or 1970s
Scanned with Canon LIDE110
© Dirk HR Spennemann 2014, All Rights Reserved
Access all my images via the Collections Page
10ª edição do Projeto Jovem Senador 2022.
Cerimônia de diplomação dos vencedores do 10º Concurso de Redação do Programa Senado Jovem Brasileiro, no Salão Nobre do Senado - Museu Histórico Senador Itamar Franco - Senado Federal.
A jovem senadora Nicolle Victoria Freire de Lima (RN) recebe diploma e bottom das mãos da diretora da Secretaria de Comunicação Social do Senado Federal (Secom), Erica Ceolin, e da secretária-geral-adjunta da Mesa do Senado Federal, Sabrina Silva Nascimento.
Foto: Rodrigo Viana/Agência Senado
This guy goes with me everywhere these days. Was giving him a rest while I took a few digital shots today. Currently loaded with Kodak Ektar 100.
It wasn't until just recently that I saw Tron Legacy and finally understood what the costumes these dancers wear in Electronica were supposed to be. Now that I know, I don't really care either way. I do like photographing them though.
It seemed the years of aimless wandering and hard work had come to fruitition. This was to become a year of rest. Of bliss.
Palestinian refugees children warm themselves during a cold weather in Gaza City on, 19 January 2018. Media report that the US President Donald J. Trump had vowed to freeze about 125 million US dollar of aid for the United Nation Relief and Works Agency (UNRWA) for Palestinian Refugees. The US ambassador to the United Nation (UN) Nikki Haley was quoted as saying that Trump did not want to add or stop funding until the Palestinians agree to return to the negotiation table. Following the 1948 Arab-Israel conflict, UNRWA was established by the United Nation General Assembly Resoluation 302 (IV) in 1949 to carry out direct relief and works programs for Palestinian refugees from May 1950 on. until today, some five million Palestinian refugees are eligible for their services, UNRWA says on their website.
Photos by @mohammed_zaanoun
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Touring production of The NationalTheatre and The Bristol Old Vic. -1989 -with Edward Petherbridge and Sian Thomas
Dance Programme on January 31, 2014 5:30 pm - 7:30 pm in Vivekananda Auditorium, Ramakrishna Mission, Delhi.
Performed by children of Sri Nruthya Kala Nilayam, Anantpur, Andhra Pradesh.
Students attending program at the Amphitheater, undated. Sherrod Library (now Nicks Hall) in background (right); Carter Hall in background (left).
UPA-Students outdoors (66-012)
This is what I'm doing at work for the last 2 weeks, coding and coding.
Esto es lo que estoy haciendo en el curro estas últimas 2 semanas, picar y picar codigo
Carnaval Ayacuchano fue lanzado en Palacio de Gobierno en el marco del programa “Palacio para Todos”
Second version of the PF powered train, controlled by an Mindstorms EV3.
In the previous version, it was not possible to access the charging plug at all. Making it impossible to recharge the battery.
In this version, this problem has been solved. The access to the charging plug is now under the easy-to-remove roof of the train.
In this photo you see the power cable connected.
SAN PEDRO - With the legendary battleship USS Iowa and renowned LAFD Fireboat 2 as a backdrop, the first ever graduates of the Firefighter/EMS Magnet (FEMS) program at Phineas Banning High School in Wilmington, California were honored by civic leaders, including City of Los Angeles Fire Chief Ralph Terrazas and Assistant Chief Steven Gutierrez, both alumni of the school, at a waterfront ceremony on May 24, 2019. Chief Terrazas warmly congratulated each FEMS graduate with a hearty handshake and words of encouragement as their families cheered their unique 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: 052419 - Banning High School FEMS Graduation
Photo Use Permitted via Creative Commons - Credit: LAFD Photo | Alex Gillman
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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)