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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)
The United States Air Force Band String Quartet held a special concert on May 8, 2016 for His Majesty King Norodom Sihamoni, Her Majesty Queen Mother Norodom Monineath Sihanouk, and other invited guests to commemorate a performance that took place on May 9, 1956 in Phnom Penh at the invitation of the late King Norodom Suramarit and Queen Sisowath Monivong Kossomak Nearireath Serei Watana.
Joined by two Cambodian artists, The United States Air Force Band String Quartet played a mix of American, European, and Cambodian music, including two pieces by King Sihanouk that premiered in 1956.
The musicians concluded the 60th Anniversary Concert with a special birthday message for HM King Norodom Sihamoni and a heart-warming encore performance of "Monika" in honor of HM Queen Mother Norodom Monineath Sihanouk.
[U.S. Embassy photo by Un Yarat]
Ignacio Cabrera Fernández, director general del Programa de Promoción Turística de la SRE, hizo referencia al Consejo de Diplomacia Turística, mediante el cual se promocionarán los atractivos turísticos de México en el exterior, en la reunión del Consejo Directivo de Concanaco.
Foto: Félix Zetina
School Health Program ~
With the vision of "Better Health.Better Education", Trinity Care Foundation is making preventive healthcare affordable and accessible to thousands of Government School Students in Karnataka, India through a one of it’s kind School Health Program.
Corporate Social Responsibility / CSR Projects implemented in Karnataka, India by www.trinitycarefoundation.com/csr. Write to [ support@trinitycarefoundation.org ] to get in touch with us to manage and implement your company's CSR initiatives !
Join us at :- www.facebook.com/trinitycarefoundation for updates regarding Employee Engagement & Employee Volunteer Opportunities !
Follow us on Twitter for more outreach program updates: www.twitter.com/tcfindia ~ www.instagram.com/trinitycarefoundation
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.)
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
Connect with us: LAFD.ORG | News | Facebook | Instagram | Reddit | Twitter: @LAFD @LAFDtalk
Blog Post : the-sky-calls.dreamwidth.org/119169.html
Craft File : kerbalx.com/CaptKordite/Ezeticolev-A108
KSP 1.11.2 + Kronal Vessel Viewer
CGIAR Livestock and Fish Research Program : First Annual Program Review and Planning Meeting 20-22 May 2013, Addis Ababa, Ethiopia (photo credit: ILRI\Zerihun Sewunet).
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.
Think of the impression you could make with this simple, modern, graphic program! Your initials or another customized "logo" is laser cut.
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)