k*********g
发帖数: 160 | 1 http://www.digitaltrends.com/photography/sony-alpha-a77-says-go
The camera has a translucent mirror for fast autofocusing even while
shooting video.
Don’t feel ashamed if you thought the new Sony Alpha A77 is a DSLR. But it
’s not. It’s a glimpse as to what may make DSLRs obsolete.
The A77 is exactly the kind of expensive ($2000 kit), hulking (weather-
sealed magnesium body) piece of camera hardware with ridiculous specs (24.3
megapixel APS-C sensor, ISO 50-16,000) that photographers everywhere drool
over.
But the coolest part, the real game-changing bit of tech, is inside: the A77
has no traditional mirror, which makes it something altogether different
than your average DSLR. Instead, Sony’s designed a translucent replacement
that offers ridiculous fast autofocusing with less bulk.
The ‘reflex’ part of a digital single lens reflex camera refers to the
mirror situated behind the lens that both sends an image to the viewfinder
and, more importantly, allows the laser-fast autofocusing of the modern DSLR
. If you’ve ever wondered why a point-and-shoot takes a second to fire
while a DSLR snaps away near-instantaneously, it’s because of that mirror
system.
The only problem is, having a mirror flip-flopping around inside a camera
means that camera must be big enough to hold it, and offers more complexity
and more parts to break. Additionally, when a camera is in burst or video
mode, the mirror stays flipped out of the way, making continuous focus
difficult.
Sony’s new tech goes a long way towards eliminating all of that. Basically,
the translucent mirror setup the A77 has reflects just enough light for
focusing needs while letting the image pass through to the sensor normally.
This has the potential to be more compact, but more importantly means that
the camera’s phase-detection autofocus system always has a source to focus
on. DSLRs have been already available with continuous autofocus, but they
are forced to use a less accurate sensor-based solution when in video or
burst mode. The A77′s translucent mirror allows it to always use its most
accurate focusing system.
It’s a huge breakthrough for DLSR videographers, who now have a viable
option for seriously fast and accurate focusing (read: great for sports). It
also allows the camera to have a crazy burst rate: 12 frames per second at
24.3-megapixels, far faster than any DSLR, even those that use lower
resolutions.
The A77 isn’t the first Sony camera to use the translucent mirror tech; the
A55 and A33 had it last year. But with a vastly improved sensor, a more
powerful Bionz image processor and the ability to shoot AVCHD Progressive-
format HD (1080p at 60fps!), the A77 takes full advantage of the tech.
So what are the downsides? There’s one major one: the A77 has no
traditional optical viewfinder, which absolutely will prove to be a
dealbreaker to some photographers would simply won’t frame a photo looking
at a screen, even if the A77 has an impressive 3″ OLED eye-level viewfinder.
That aside, the new mirror tech adds a bit of a flicker to the screen while
shooting video, although until we get our hands on one it’s tough to tell
how annoying that may or may not be. Finally, until test models start going
out, the verdict is still out on how great images and video turn out to be.
But on paper, the A77 is a wonderful addition to the current camera realm.
Along with the Micro Four-Thirds format, there’s another seriously viable
option for an interchangable-lens camera that isn’t a DSLR. For a lot of
people, that’s going to be a very good thing. |
k*********g
发帖数: 160 | 2 现在Alpha A77 叫 DSLT，不是 DSLR |
x5
发帖数: 27871 | 3 签名档里的图片太大了，高度不得超过100 pixel
it
3
【在 k*********g 的大作中提到】
: http://www.digitaltrends.com/photography/sony-alpha-a77-says-go
: The camera has a translucent mirror for fast autofocusing even while
: shooting video.
: Don’t feel ashamed if you thought the new Sony Alpha A77 is a DSLR. But it
: ’s not. It’s a glimpse as to what may make DSLRs obsolete.
: The A77 is exactly the kind of expensive ($2000 kit), hulking (weather-
: sealed magnesium body) piece of camera hardware with ridiculous specs (24.3
: megapixel APS-C sensor, ISO 50-16,000) that photographers everywhere drool
: over.
: But the coolest part, the real game-changing bit of tech, is inside: the A77
|
k*********g
发帖数: 160 | 4 啊，是佛版的规定么？
【在 x5 的大作中提到】
: 签名档里的图片太大了，高度不得超过100 pixel
:
: it
: 3
|
x5
发帖数: 27871 | 5 是啊，呵呵，老金的645D用的怎么样了？
【在 k*********g 的大作中提到】
: 啊，是佛版的规定么？
|
k*********g
发帖数: 160 | 6 现在基本在接灰，很少出去拍照了。
【在 x5 的大作中提到】
: 是啊，呵呵，老金的645D用的怎么样了？
|
s******n
发帖数: 393 | |
t*a
发帖数: 18880 | 8 大陆9月，美国10月？
【在 s******n 的大作中提到】
: A77啥时候上市啊？
|
s******n
发帖数: 393 | 9 终于开始歧视美国了， 俺深感欣慰
【在 t*a 的大作中提到】
: 大陆9月，美国10月？
|
c********y
发帖数: 30813 | 10 一直这样啊，总是亚洲拿到的早
【在 s******n 的大作中提到】
: 终于开始歧视美国了， 俺深感欣慰
|
|
|
s******n
发帖数: 393 | 11 啥时候苹果的东西也能在亚洲先上市就好了
【在 c********y 的大作中提到】
: 一直这样啊，总是亚洲拿到的早
|
k*********g
发帖数: 160 | 12 不会这么晚吧。
【在 t*a 的大作中提到】
: 大陆9月，美国10月？
|
e****t
发帖数: 17914 | 13
你马甲太多了
【在 k*********g 的大作中提到】
: 现在基本在接灰，很少出去拍照了。
|
k*********g
发帖数: 160 | 14 kingfvcking不是马甲，只是我定期会把ID自转让一次，左手交到右手，一些参数会被清零。
每次自转让ID,签名档和说明档会被清空，上站次数变成[10]，发文数变成[0]
【在 e****t 的大作中提到】
:
: 你马甲太多了
|
p**p
发帖数: 3386 | 15 难道A77里面没有镜子？叫DSLR有何不妥？
it
3
【在 k*********g 的大作中提到】
: http://www.digitaltrends.com/photography/sony-alpha-a77-says-go
: The camera has a translucent mirror for fast autofocusing even while
: shooting video.
: Don’t feel ashamed if you thought the new Sony Alpha A77 is a DSLR. But it
: ’s not. It’s a glimpse as to what may make DSLRs obsolete.
: The A77 is exactly the kind of expensive ($2000 kit), hulking (weather-
: sealed magnesium body) piece of camera hardware with ridiculous specs (24.3
: megapixel APS-C sensor, ISO 50-16,000) that photographers everywhere drool
: over.
: But the coolest part, the real game-changing bit of tech, is inside: the A77
|
e****t
发帖数: 17914 | 16
膜拜
欢迎老金
【在 k*********g 的大作中提到】
: kingfvcking不是马甲，只是我定期会把ID自转让一次，左手交到右手，一些参数会被清零。
: 每次自转让ID,签名档和说明档会被清空，上站次数变成[10]，发文数变成[0]
|
k*********g
发帖数: 160 | 17 R指反射
T指透射
人家自己都说是DSLT了
【在 p**p 的大作中提到】
: 难道A77里面没有镜子？叫DSLR有何不妥？
:
: it
: 3
|
p**p
发帖数: 3386 | 18 其实是半反射，还是反射的一种
【在 k*********g 的大作中提到】
: R指反射
: T指透射
: 人家自己都说是DSLT了
|
