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Camera shutters can be fitted in two positions: Central shutters are mounted within a lens assembly, or more rarely behind or even in front of a lens, and shut off the beam of light where it is narrow. A leaf mechanism is usually used. Focal-plane shutters are mounted near the focal plane and move to uncover the film or sensor. Shutters immediately behind the lens were used in some cameras with limited lens interchangeability. Shutters in front of the lens were used in the early days of photography.Other mechanisms than the dilating aperture and the sliding curtains have been used; ...

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A wooden boat packed with dozens of asylum seekers – including women and children – crashed off Australia’s Christmas Island on Wednesday, flinging passengers into the sea. At least 27 people were killed, according to Australian officials. By News Wires (text) AFP - At least 27 people died in a refugee boat accident off western Australia, Customs officials said Wednesday, adding that there were 42 survivors but the search and rescue operation was still underway. "As at 1800 (0700 GMT) 41 persons have been recovered from the water and another person made it to the ...

CINCINNATI — Receiver Terrell Owens says the Cincinnati Bengals' lousy season is the result of underachieving "from the top down," and he particularly points a finger at the coaches. Teammate Chad Ochocinco asked Owens during "The T.Ocho Show" on Versus cable network Tuesday night why he thinks the team is 2-11. "I think there's underachieving from the top down," Owens said. "You start with the owner, you start with the coaches. And obviously we as players, we are a product of what the...

Sen. John Thune (R-S.D.), a potential 2012 presidential candidate, appeared to unofficially launch one of the first salvos in the forthcoming GOP primary on the Senate floor Tuesday, when he blasted "sideline" spectators for smearing the current tax cut deal reached last week between Obama and Republicans."It's easy to stand on the sidelines and criticize this proposal," Thune said in a speech captured by ABC News. "And it's perhaps even politically expedient to stand on the sidelines and criticize this proposal. But let me make one thing very clear Mr. President, advocating against this ...

Two new classified U.S. intelligence assessments on the war in Afghanistan reportedly say there is a limited chance of success unless Pakistan hunts down insurgents operating from havens on its Afghan border. The National Intelligence Estimates offer a more negative assessment than a review of the U.S. war strategy that the Obama administration is set to unveil on Thursday. The intelligence reports -- one on Afghanistan and one on Pakistan -- say that although there has been progress in the...

(CNN) -- Clay Duke sat quietly through the first portion of the Bay District Schools, Florida, school board meeting Tuesday afternoon as local children were honored for their achievements. When it came time for citizens to bring up issues, the 56-year-old resident calmly approached the front. He spray painted a red "V" with a circle around it on the wall, brandished a small-caliber handgun and ordered the room cleared at a Panama City schools building. "Six men stay. Everyone else leave," the...

(CNN) -- At least 27 people were killed Wednesday after a boat carrying asylum seekers crashed into cliffs along the shore near the coast of Christmas Island, Australian rescue and Customs and Border Protection officials said.Rescue officials were able to pull 41 people from the "dangerous" waters and one person was able to swim to shore."The rescue is being conducted in extremely difficult and dangerous conditions," the border protection agency said in a statement. '"We will continue the search until last light and review the situation and determine what further actions might need to be ...