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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 purpose of the I CAN Play Hockey program is to teach basic hockey skills to children and youth with autism in a safe and supportive environment. The I CAN Play Hockey program will introduce participants to stick handling, passing and shooting. There will also be time for fun and non-competitive scrimmaging.
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.
The Ceramics Program, Office for the Arts at Harvard will present its annual Holiday Show and Sale December 7-10, 2017 in its state-of-the art facility at 224 Western Avenue, Allston, Massachusetts.
Nearly seventy artists will present an extraordinary selection of ceramic work in this annual exhibition. From functional dinnerware to sculptural masterpieces, this popular exhibition has something for everyone and attracts several thousand visitors each year. Free cups made by the exhibiting artists will be given away on a first-come, first-served basis during the festive Opening Reception on Thursday, December 7, from 4:00 – 8:00 pm. The Show and Sale continues Friday, Saturday, and Sunday, December 8, 9, and 10, from 10:00 am – 7:00 pm.
Gallery 224, the Ceramics Program’s dedicated exhibition space, will showcase works from artists participating in the Holiday Show and Sale.
The Ceramics Program Show and Sale runs concurrently with the Allston-Brighton Winter Market next door at the Harvard Ed Portal. Artists’ studios nearby at 119 Braintree Street will also be open on Saturday and Sunday for Allston Open Studios.
A touchstone for the arts within Barry’s Corner, Allston, the Ceramics Program, Office for the Arts at Harvard provides a creative studio and laboratory study environment for Harvard students, staff, and faculty, as well as designers, artists, scholars, and scientists from the greater Boston, national and international arenas. Courses, workshops, master classes and special events are offered in the program's 15,000-square-foot studio at 224 Western Ave., near the Harvard Stadium in Allston.
The Studio is wheelchair accessible. For more information or directions please call 617.495.8680 or visit www.ofa.fas.harvard.edu/ceramics
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.
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.
Blog Post : the-sky-calls.dreamwidth.org/119169.html
Craft File : kerbalx.com/CaptKordite/Ezeticolev-A108
KSP 1.11.2 + Kronal Vessel Viewer
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.
One of the UP Steam Program members sports a CNW vest as he helps gets Union Pacific "Big Boy" 4014 settled down for the night at Kansas City Union Station.
...
Kansas City, Missouri, USA
October 15, 2024
Canon EOS 60D
Canon EF-S 18-55mm f/3.5-5.6
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)
Associates from Puget Sound Energy's Green Power Program are here to answer your questions about the program and help you enroll today! www.pse.com/greenpower
Photo by Erica Binns
Rotary Club of Nagpur organised 'The magical power of mind' programme by noted spiritual trainer, motivator and corporate trainer, Dr.Sneh Desai at Persistent System Ltd Auditorium, IT Park, opposite VNIT Institute at 6 pm on September 27, 2013