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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 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)
Mediante el programa social Contra la Explotación Sexual Comercial Infantil que coordina el Reg. Martiniano Maldonado Fierros, se han llevado a cabo cursos en escuelas y centros laborales para prevenir la Trata de personas y otros delitos derivados del mismo.
Los alumnos de la secundaria técnica "Isla Hermanas", ubicada en Rancho Viejo, participaron en dichos cursos que impartió el compañero croquista Julio Ávila Guzmán.
La clausura se efectuó el 24 de enero en presencia de nuestro dirigente municipal Mario Machuca Sánchez y la diputada local Laura Fernández Piña.
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.)
Teaching program in La Serena Chile: William Zeller is our latest volunteer in Chile, he is doing a 4 week program at one of our primary schools. He also is taking Spanish Lessons (4 hours a day), great work William, for what our local coordinator has told us the students will miss you once the program is over.
Blog Post : the-sky-calls.dreamwidth.org/119169.html
Craft File : kerbalx.com/CaptKordite/Ezeticolev-A108
KSP 1.11.2 + Kronal Vessel Viewer
Over 35 students from our nursing programs started the 2015 semester with a professional team building day at Riverfront Park in Hartford. Fun!
Photos by University of Hartford staff
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)
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
UWO Graphic arts students present their final self directed projects for critique in the art department in the Arts and Communications building. Tuesday, December 11, 2018.
maymare welfare society president mre.Rukhsana anjum arrange prevent AIDS awareness program cordination with dr.muzzafer
University of Kentucky President Eli Capilouto joined the president of the UK Student Development Council, Jonathon Nunley, Kentucky Historical Society Marker Program Coordinator Becky Riddle and others April 15 in dedicating the latest addition to the Live Blue Legacy historical marker program. The marker is made possible through donations from members of the Class of 2012.
This historical highway marker, the 19th in a series, pays tribute to UK student traditions dating back more than 100 years.
An early rivalry between freshman and sophomore classes on the UK campuses was the annual 'Flag Rush' competition where one class would defend their flag from being captured by a rush of competitors.
Replacing the flag rush in 1913 was the 'Tug of War' across Clifton Pond. Students were granted a half-holiday for the annual drenching, and crowds could reach more than 2,000 for the event.
The dedication ceremony and unveiling of the marker took place at a site located near the William T. Young Library on the UK campus. A reception followed.
Since 1994, the Live Blue Legacy Program has supported the placement of Kentucky Historical Society Highway Markers across the UK campus. The Live Blue Legacy Program is administered by the Student Development Council, whose members solicit gifts from members of the graduating class, in this case the Class of 2012. These funds are used to purchase, install and dedicate a marker in the name of that particular class.