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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
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 seemed the years of aimless wandering and hard work had come to fruitition. This was to become a year of rest. Of bliss.
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.
Purple wedding program on purple mums
Ceremony
Colonial Avenue Baptist Church
Roanoke, Virginia
Reception
Holiday Inn Valley View
Roanoke Virginia
Wedding Coordination
Diamond Events
Stephanie Hughes
540-558-8143
DJ
RSP Entertainment
Photographer
Bert Reed Photography
Florist
Petal Pushers
Cake Baker
Kelly Cakes
Susan Kelly
(540) 977-5349
THE BELLEVUE CENTER FOR OBESITY & WEIGHT MANAGEMENT,PROGRAM DIRECTOR;MANISH PARIKH MD TEL# 212=562-3917 THE BARIATRIC ANNUAL PARTY,CELEBRATING 2 1/2 YEARS AND HUNDREDS OF POUNDS LOST!!!AUG 13 2010 PHOTOS BY GORDON GATTSEK & MONICA RUBIN,POLARBEARCI@AOL.COM
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
O programa de hoje será no Teatro Maison de France.
"...para "A Arte da Comédia", um dos mais importantes textos do ator, diretor e dramaturgo italiano, Eduardo de Filippo. No espetáculo Ricardo Blat, Thelmo Fernandes e grande elenco mostram o quanto as artes cênicas fazem parte do dia a dia de todos, além de questionarem a relação entre autoridades e artistas. Como bem define o diretor Sergio Módena, “A Arte da Comédia é antes de tudo uma celebração ao teatro e ao ofício do ator. Na peça, o autor, através de uma linguagem popular e, por muitas vezes irônica, demonstra o extremo poder da arte em nossas vidas. Em sua concepção, o teatro pode ser uma grande brincadeira, pode ser político, revolucionário, mas sempre vital à nossa sociedade.”
Vou lá conferir e depois digo como foi!
Bom domingo a todos.
(foto e texto em teatromaisondefrance.com.br/index.php/em-cartaz)
The 2012 U.S. Synchronized Skating Championships hosted by The Skating Club of Boston and Team Excel
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.
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)
Ingram Scholars Program 25th Anniversary Reunion Welcome Reception
E. Bronson Ingram College
Vanderbilt University
Photo: Anne Rayner; VU