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Old Aug 24, 2010, 4:48 AM   #1
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Default Sony announces α560, α33 and α55

See:

SHOOTING FOR THE STARS: SONY BREAKS NEW GROUND AGAIN IN DSLR SPACE WITH NEW CAMERA, LENSES

DSLR REDEFINED: SONY INTRODUCES NEW CAMERAS POWERED BY WORLD’S FIRST TRANSLUCENT MIRROR TECHNOLOGY ENABLING SIMULTANEOUS AUTO FOCUS AND CAPTURE IN AN INTERCHANGEABLE LENS DIGITAL CAMERA
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Old Aug 24, 2010, 10:00 AM   #2
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Looks like Sony is concentrating in the APS-C DSLR market by introducing full-time life- view by using the translucent mirror. Translucent mirror is old technology and was once used by Canon in their SLR in the seventies. Sony has improved this technology to make it faster. They have just declared war on every DSLR maker, I am sure that the other guys are burning mid-night oil trying to catch up. What a pleasant surprise!
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Old Aug 24, 2010, 10:23 AM   #3
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Since the mirror must simultaneously reflect light up to the optical viewfinder and let light pass through to the image sensor, then, obviously, less light gets to both the optical viewfinder and the image sensor. I'd be interested to see how they deal with the light loss to both. Is the viewfinder dimmer? Do they use a higher ISO setting to compensate for the loss of light?
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Old Aug 24, 2010, 10:27 AM   #4
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They use an EVF to combat light loss to the viewfinder.

I think they combat the light loss to the sensor by using a higher than noted ISO, so that ISO 100 is really ISO 160 or so, etc. That is just speculation thus far.
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Old Aug 24, 2010, 10:49 AM   #5
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There is the summary on the A560 and A580:
http://www.imaging-resource.com/NEWS/1282622510.html
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Old Aug 24, 2010, 2:06 PM   #6
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Quote:
Originally Posted by TCav View Post
Since the mirror must simultaneously reflect light up to the optical viewfinder and let light pass through to the image sensor, then, obviously, less light gets to both the optical viewfinder and the image sensor. I'd be interested to see how they deal with the light loss to both. Is the viewfinder dimmer? Do they use a higher ISO setting to compensate for the loss of light?
According to dpreview, the EVF is larger and brighter than most entry-level and mid-level DSLRs. And the EVF itself offers Panasonic GH1/Olympus VF-2 levels of performance and resolution:

http://www.dpreview.com/reviews/sonyslta55/

Really, this is an impressive entry that creates more waves than the NEX cameras. And it sounds like Olympus is working on a response - possibly a camera with translucent mirror that can use regular four-thirds lenses. This is all pretty exciting.
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Old Aug 24, 2010, 2:32 PM   #7
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The olympus offering uses an electronically controlled crystal mirror that becomes fully translucent when charged. That was initially what I thought the Sony was too. Looking forward to that one.
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Old Aug 24, 2010, 3:34 PM   #8
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A55 and A33 - But giving it 10fps and 7fps, and not having a evf that can refresh fast enough. Will make for an interesting tracking of a fast moving object. Realistically for action shooter you can only shoot at 3fps if you need to track the subject.

But shooting with a 1/3 lost on light makes and making it up on iso can be a bad thing for a low light shooter.

A560 and A580 looks to be a very good photography tool especially with the new cmos sensor.
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Old Aug 24, 2010, 10:36 PM   #9
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I don't see any real difference between A560/580 an the A33/55 except $100 more for the latter one.
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Old Aug 24, 2010, 10:39 PM   #10
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5fps vs 3fps with focus because the evf refresh rate can not keep up, you do not have the 1/3 lost of light. Those are the big advantages advantages on the photography advantage.
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