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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.
Our Ascension Mk1 lifter failed to achieve orbit on its own so a second stage will be needed to push the payload into orbit, which will be achieved hopefully by the Viklun engine, seen here shortly after arriving in the VAB
Flash dédié totalement automatique avec illuminateur d'assistance AF pour appareils Minolta de la série "xi" utilisable avec les appareils de la série "i" sous certaines conditions. Contrôle de l'exposition automatique par mesure TTL sur le film, dans tous les modes. Dispose d'un adaptateur grand angle permettant de couvrir le champ de tous les objectifs à partir de 28 mm, NG 20 (en mètres à ISO 100) Alimentation par 4 piles AA. 67 x 61,5 x 92,5 mm, 140 g. (données extraites de la notice du fabricant)
Brocante du 2 mars 2014 à Montrottier (Rhône)
Bado Jabal, Dadu, Sindh April 2009
Pervaiz Lodhie, LEDtronics
Ayaz Mahmud, ShaanTech
Dr Raza Mehdi Shah, Sehwan Sharif
Visit to check and observe the use of Solar Charged LED Lanterns donated under the "Pehli Kiran" socio-economic empowerment program for the interior Sindh poor.
Village Bado Jabal in Sindh Pakistan
Visit facilitated by Pir Dr Syed Raza Mehdi Shah Subzwari, Sajjada Nashin, Qalandar Lal Shabaz, Sehwan Sharif in Dadu District of Sindh Pakistan. Also visit to the Lal Shahbaz Qalandar Shrine.
Solar LED Lanterns designed manufactured for LEDtronics Torrance USA by Shaan Technologies KEPZ Karachi Pakistan.
Governor Kay Ivey held a press conference to announce the Alabama Sentry Program Wednesday May 30, 2018 in Montgomery, Ala. The governor will also signed an Executive Memo on Alabama Sentry Program Implementation Directives as part of the press conference. (Governor's Office, Hal Yeager)
During a Native American history-themed sleepover at the National Archives in Washington, DC, 101 kids and their grown-ups spent the night enjoying history-related activities, learning from special guests actor Martin Sensmeier, Jim Thorpe historians Bob Wheeler and Flo Ridlon, and Native American storyteller Perry Ground. After sleeping over night in the Rotunda, participants enjoyed a pancake breakfast made by the Archivist of the United States, David S. Ferriero, on October 14, 2018.
Copyright 2014 Hilde Heyvaert.
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No unauthorized use, reproduction or distribution without prior permission.
YB Law Choo Kiang memeriksa tekanan darah oleh petugas sukarela dari HALUAN
Program Masyarakat Madani di Perkampungan Batu Uban dirasmikan oleh Timbalan Ketua Menteri 1, YB Mohamad Fairus Khairuddin dan ADUN Batu Uban, YB Raveentharan