Excerpt: Plenty of DSLRs put a limit on how long video clips can be. Canon's 7D and Rebel T2i cap out at 12-minutes and even the current king of video DSLRs, the 5D Mark II, maxes out at 29:59 or when the file size reaches 4 GB.
Excerpt: On August 23, 2010, Sony announced two new APS -C digital cameras, the SLT -A55V and the SLT -A33. Both feature what Sony are calling “Translucent Mirror Technology”. What this appears to be is the use of a semi-reflecting fixed pellicle mirror, such as Canon has previously used on camera such as...
Excerpt: More and more interchangeable lens cameras are going mirrorless these days, but for this pair of cameras, Sony didn't nix the mirror all together. Instead, they made it fixed and translucent so that it could "split" the optical pathway, directing light to both the main image sensor and the phase...
Summary: Sony has done a remarkable job of resurrecting semi-transparent mirror technology to create a new kind of DSLR, solving one of the toughest problems so far in video capture with a camera designed primarily for still imaging.
Summary: APS-C (23.5x15.6mm), 14.2-megapixel Exmor HD CMOS image sensor Sony's new Translucent Mirror Technology (aka TMT) Sony/Minolta A bayonet lens mount system Full Time Live View SSS (Super Steady Shot) image stabilization built into the body Sweep Panorama Mode (Regular & 3D) 3-inch, articulated LCD...
Summary: The semi-reflective mirror in the SLT cameras allows most of the light to pass through to the main sensor, but crucially reflects a smaller portion upwards to a traditional phase-change autofocus system.
Pros: Very fast and continuous AF in Live View and HD movies., High resolution articulated screen and decent EVF., Fast continuous shooting up to 7fps., Multi-frame to reduce noise, increase DR or create panoramas., Continuous AF and stabilisation on entire Alpha lens catalogue.
Cons: Some light permanently lost due to semi-reflective mirror., No live image between frames in fast continuous bursts., Modest buffer size: approx 14 best quality JPEGs., Most Alpha mount lenses focus quite audibly in movies., Some will notice rainbow tearing artefacts in viewfinder.
Summary: The A33 undoubtedly opens new doors and Sony’s clear-cut commitment to pushing new technology into the photo market is an interesting angle for a company looking for new approaches to capture today’s demanding audiences.
Pros: Super-fast continuous focus burst shooting, phase-detection live-view, excellent 1080i HD movie autofocus
Cons: Widescreen ratio LCD, EVF not for everyone, noisy kit lens (video can pick up lens zoom and focus noise)
Summary: No longer restricted to optical viewfinders or the mechanisms required for film transportation, camera manufacturers have gone back to the drawing board to \Lsee how digital technology can evolve camera design.