|
y*b
发帖数: 3190 | 2 http://www.sonyalpharumors.com/new-a7rii-extensive-autofocus-te
"The video you see here on top (via Youku.com) is a very extensive autofocus
test of the new A7rII. Sadly it’s in Chinese only so only a small part of
our readers will understand what they are talking about. Still you can
scroll to the following minutes to see the autofocus speed: Minute 1:15,
Minute 2:25, Minute 3:10 and Minute 4,47.
Our reader Jack also provided with a short description of the video (Thanks!
):
This video is publi... 阅读全帖 |
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R***a
发帖数: 41892 | 3 人问autofocus，没问autofocus micro adjustment |
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x***k
发帖数: 20754 | 4 没有autofocus的症状是什么？
1，相机不驱动镜头对焦
2，相机能驱动镜头，但是始终无法合焦
3，相机能驱动镜头，也提示合焦，但是照片上没有焦点
4，其他
相机当前的具体设定是什么？
1，AF模式是AF-A，AF-S还是AF-C？
2，AF area模式是single spot，dynamic area还是3D tracking？
你把问题说明白了才好回答，一句没有autofocus，谁知道怎么回事啊 |
|
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c*****0
发帖数: 2759 | 6 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Canon EF 50mm f/1.8 II Standard AutoFocus Lens
单张面值:
$85 free shipping with ground + NY / NJ sales tax
可接受价格(必须明码标价！):
as title
物品新旧要求:
NEW
邮寄方式要求:
ML
买卖双方谁承担邮寄损失(Required if not code only):
before I after you
付款方式说明:
BOA,check
bumper可收人民币
其他补充说明:
广告的有效期:
物品来源(Required for All Cards!):
我的联系方式:
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip: |
|
u*l
发帖数: 523 | 7 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Cano 75-300mm f/4.0-5.6 III Autofocus Lens
单张面值:
110
可接受价格(必须明码标价！):
110
物品新旧要求:
New， Never opened
邮寄方式要求:
YL
买卖双方谁承担邮寄损失(Required if not code only):
default
付款方式说明:
Bill pay，paypal
其他补充说明:
还有另外两个镜头，可以一块出。
EF 70-300mm f/4-5.6 IS USM Lens $400
EF-S 55-250mm f/4-5.6 IS II Lens for Digital SLR Cameras $ 170
广告的有效期:
till gone
物品来源(Required for All Cards!):
BH
我的联系方式:
mitbbs
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
68*** |
|
c*****0
发帖数: 2759 | 8 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Canon EF 50mm f/1.8 II Standard AutoFocus Lens
单张面值:
$85 free shipping with ground + NY / NJ sales tax
可接受价格(必须明码标价！):
as title
物品新旧要求:
NEW
邮寄方式要求:
ML
买卖双方谁承担邮寄损失(Required if not code only):
before I after you
付款方式说明:
BOA,check
bumper可收人民币
其他补充说明:
广告的有效期:
物品来源(Required for All Cards!):
我的联系方式:
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip: |
|
i******n
发帖数: 839 | 9 我想要的物品:
Canon EF 50mm f/1.8 II Standard AutoFocus Len
单张面值:
amazon current lowest list $114
可接受的价格(必须明码标价！):
$95
物品新旧要求:
New
邮寄方式要求:
your label
买卖双方谁承担邮寄损失(Required if not code only):
before drop off you after me
付款方式说明:
noncc paypal
BOA
其他补充说明:
广告的有效期:
物品来源:
我的联系方式:
mitbbs
二手交易风险自负！请自行验证是否合法和一手卡！: |
|
u*l
发帖数: 523 | 10 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Cano 75-300mm f/4.0-5.6 III Autofocus Lens
单张面值:
110
可接受价格(必须明码标价！):
110
物品新旧要求:
New， Never opened
邮寄方式要求:
YL
买卖双方谁承担邮寄损失(Required if not code only):
default
付款方式说明:
Bill pay，paypal
其他补充说明:
还有另外两个镜头，可以一块出。
EF 70-300mm f/4-5.6 IS USM Lens $400
EF-S 55-250mm f/4-5.6 IS II Lens for Digital SLR Cameras $ 170
广告的有效期:
till gone
物品来源(Required for All Cards!):
BH
我的联系方式:
mitbbs
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
68*** |
|
d*******u
发帖数: 943 | 11 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Canon EF 75-300mm F/4-5.6 III Autofocus Telephoto Zoom Lens
单张面值:
New in box。
可接受价格(必须明码标价！):
85 OBO
物品新旧要求:
new
邮寄方式要求:
YL
买卖双方谁承担邮寄损失(Required if not code only):
before me after you.
付款方式说明:
BOA, chase quickpay, billpay
其他补充说明:
广告的有效期:
物品来源(Required for All Cards!):
我的联系方式:
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
750** |
|
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s**r
发帖数: 255 | 13 autofocus调的是什么物理参数（焦距，相距，。。。）？万佛科普以下。 |
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s**r
发帖数: 255 | 14 这是实现的技术，待我再好好学习以下。但是麻烦您把这个实现技术再抽象以下。如果
我把整个复杂的镜头就抽象成一个thin lens，难道autofocus调的不是相距（或跟精确
的说是等效相距）？
反的 |
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s**r
发帖数: 255 | 15 不管镜头多复杂，我就把它一个镜头抽象成三个参数（u，v，f）。我就是想知道
autofocus调的是那一个。要是还有别的参数，请指教。抑或是镜头根本就没有可参数
化的抽象数学模型？ |
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s**r
发帖数: 255 | 16 多谢了。你说的那个micro adjustment是啥高级东东?是不是autofocus 没对你想要的
点上，你就在手调以下？ |
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h********e
发帖数: 1130 | 17 It's AF-A, funny thing is that it only have problem when I use 18mm, and
aim at the canyon, so I guess when the focal point is on a big trunk of
mountain, the camera don't know where to focus because the contrast is not
obvious? but if I zoom in on a mountain, it works fine. or if I aim at a
tree (which is stand out from background), autofocus works fine too.
3D, |
|
s****h
发帖数: 921 | 18 以前在板上问过类似的问题。
新买的D90。
镜头是老的。一个定焦，一个变焦的（afs 18-105 1：3.5-6.8GED vr）.
定焦的没问题
变焦的发现没有autofocus，咋回事啊？
前不久我在朋友D40上做过测试，这个变焦的镜头没问题。
难道这个镜头跟d90兼容有问题？ |
|
s****h
发帖数: 921 | 19 D90是新到的。
感觉应该没问题，要不为啥定焦镜头可以autofocus。
你说re-set？
我看看manual先。
谢谢！！
按钮 |
|
f*****d
发帖数: 2726 | 20 那个和autofocus没有关系，是锁定曝光或者对焦的，应该不会影响镜头的自动对焦。 |
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y*****d
发帖数: 4451 | 21 你说的autofocus不会是AF-s那个声音吧？ |
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s***7
发帖数: 1644 | 22 这两个我都不很care，不过那个autofocus倒是有点意思。不知道谁用过啊。 |
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d******y
发帖数: 11545 | 23 [fs] Canon EF 24-105mm f/4L IS USM Autofocus Lens @ $700 包邮， or $690 不包
邮。
从6d取出来的白盒子，全新镜头，可提供receipt供保修使用。
pm联系。 |
|
L*******n
发帖数: 40 | 24 两周前才入手的Canon 6D+24-105套机，昨天断断续续出现不能autofocus的问题，今天
彻底不能了。。。光圈值也不显示了，一直显示00.不知道这是什么问题，我怀疑是镜
头的motor坏了？不知道有没有前辈能指点一二。现在在外面，身上也没有其他镜头，
也不排除是机身的问题。
谢谢！！ |
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w*********g
发帖数: 813 | 25 喜欢７０D的video autofocus功能，可惜不是全副 |
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k********n
发帖数: 756 | 26 It autofocus well for a while and then suddenly stops working and then works
well again.
Anybody got the problem? Does the lens or the camera have problems? |
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p***e
发帖数: 29053 | 27 会不会是枪手?
autofocus
of
Thanks!
They |
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|
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y*b
发帖数: 3190 | 30 "Samyang announced the new 35mm f/2.8 FE autofocus lens. The Korean pricing
is ￦349000 (about 299$). This is $500 cheaper than the Zeiss 35mm f/2
.8 FE lens (Amazon, B&H, Adorama, eBay). And apparently the image quality is
on par with the Zeiss!"
zz from SAR |
|
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R***a
发帖数: 41892 | 32 i-r吐槽了好几段
Unfortunately, they also said that about the EOS M's Hybrid Autofocus system
, introduced just a few months ago on the T4i. We've been waiting for the
T4i's main kit lens to arrive, the 18-135mm STM lens, so we haven't
completed our review. But the sad truth is that the T4i's Live View mode
autofocus is terribly slow. Both the T4i and EOS M have a new sensor with
phase-detect sites embedded near the center, as well as contrast-detection
autofocus. But the Live View autofocus speed is v... 阅读全帖 |
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k*********g
发帖数: 160 | 33 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 ... 阅读全帖 |
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p*********r
发帖数: 4593 | 34
In terms of auto focus, nex-5r is nex-5n + phase auto focus.
The phase auto focus is used in outdoor and day time environment(has
sufficient light). In indoor or low light environment, nex-5r still uses its
old contrast auto focus that's used on nex-5n. This is called hybird
autofocus.
Somehow Sony didn't do good job on nex-5r and nex-6(same hybird
mechanism). Most of reviewers say that there is no performance improvement
in its autofocus from nex-5n to nex-5r or nex-6. Its autofocus is much
sl... 阅读全帖 |
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w****e
发帖数: 2210 | 35 Unleash the power of Nikon’s DX-format HD-SLR system.
Meet the new flagship of Nikon’s outstanding DX-format HD-SLR line-up: the
D7100. Incorporating recent
advancements in HD-SLR technology, the D7100 brings a thrilling new level of
image quality, speed, connectivity
and creative capabilities—a specially designed 24.1-megapixel DX-format
image sensor, superior low-light
performance, ultra-precise autofocus and metering, advanced video recording
features, built-in HDR, mobile
connectivity and mu... 阅读全帖 |
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p*********r
发帖数: 4593 | 36 Go read dpreview for the GX1 review(attached in the following)
GX1 and EM5 have the same problem of continuous auto focus.
V1 sets new performance bar in term of continuous auto focus for the
mirrorless system. The main reason for the V1 having fast continuous auto
focus is it has phase detection in addition to the constrast detection AF.
Sony NEX-5R and NEX-6 also have both(hybrid detection), but somehow Sony
didn't do good job(no major improvement in auto focus).
--------------Copy from the d... 阅读全帖 |
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y*********e
发帖数: 7269 | 37 Extra-smooth SDM autofocus operation
A DC motor built into the lens’ AF (autofocus) unit assures extra-smooth
autofocus operation. It features a rotation-free mechanism to keep the
focus ring stationary during autofocus operation. The user can hold the lens
in exactly the same way as when using it in the manual-focus mode.
连对焦环都不转了 |
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p*********r
发帖数: 4593 | 38 I never say V1 更值得推荐了. I only said the best part for V1 in my first
reply. Nikon 1 system 更值得推荐 if you want fast autofocus, continuous
autofocus and the video, and the price. It is the fact that V1 can do 10FPS,
V2 can do 15FPS(full resolution) continuous auto focus. That is the strong
point that Nikon 1 system has.
EM5 is top at picture quality, still picture quality at high ISO. It has
fast autofocus, but not good at continuous autofocus. That's the fact and
conclusion from most of professiona... 阅读全帖 |
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b*****s
发帖数: 3390 | 39 “Autofocus in video can exhibit focus hunting” 看来拍业余拍拍视频还是选择
索尼和佳能比较好，平滑性可以得到保证。
Autofocus in video is noticeably improved form the GH4, but even with
improved DFD technology the camera still doesn't have a true sense of depth
like it would with a phase detection system. As a result, the camera still
has a tendency to hunt for focus, creating a wobble as focus ratchets back
and forth.
You won't see the huge, obvious swings in focus we traditionally associate
with contrast detect AF, but a more s... 阅读全帖 |
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x******g
发帖数: 984 | 40 全新未开包尼康D3100相机，带2个镜头，380一套，共有两套，your shipping, 款到
发货，billpay
Nikon D3100 14MP DSLR Kit with 18-55mm and 55-200mm Lenses
Kit Contents
Nikon D3100 digital camera
Nikon AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II lens
Nikon AF-S DX Zoom-Nikkor 55-200mm f/4-5.6G ED lens
Specifications
Nikon D3100
14.2MP DX-format CMOS sensor
Shoots 1080p Full HD video
3fps continuous shooting
11-point autofocus
3” LCD monitor
Live View shooting
Built-in sensor cleaner
HDMI output
warranty from Nikon
Weight: 16oz.
... 阅读全帖 |
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x******g
发帖数: 984 | 41 全新未开包尼康D3100相机，带2个镜头，380一套，共有两套，your shipping, 款到
发货，billpay
Nikon D3100 14MP DSLR Kit with 18-55mm and 55-200mm Lenses
Kit Contents
Nikon D3100 digital camera
Nikon AF-S DX Zoom-Nikkor 18-55mm f/3.5-5.6G ED II lens
Nikon AF-S DX Zoom-Nikkor 55-200mm f/4-5.6G ED lens
Specifications
Nikon D3100
14.2MP DX-format CMOS sensor
Shoots 1080p Full HD video
3fps continuous shooting
11-point autofocus
3” LCD monitor
Live View shooting
Built-in sensor cleaner
HDMI output
warranty from Nikon
Weight: 16oz.
... 阅读全帖 |
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f******g
发帖数: 1697 | 42 ☆─────────────────────────────────────☆
amautofocus (Autofocus) 于 (Sun Jul 31 10:32:51 2011, 美东) 提到:
请教一下nyc哪家婚纱摄影比较好啊？我们不打算办婚礼，就是想拍一些外景，恳请大
家给点建议吧
之前有人推荐珍情摄影，有熟悉的能推荐个摄影师吗，或者介绍个经验也行啊
多谢多谢！！！
☆─────────────────────────────────────☆
gatsbyreally (gastby) 于 (Sun Jul 31 10:47:45 2011, 美东) 提到:
唐人街， 佳缘，老板姓洪。broadway路口。
☆─────────────────────────────────────☆
civigal (yaya) 于 (Sun Jul 31 10:49:26 2011, 美东) 提到:
haogallary
☆─────────────────────────────────────☆
amautofocus (Autofocus) ... 阅读全帖 |
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s******x
发帖数: 15232 | 43 那是因为他们搭卖的套头是有马达的，这才能配着没有马达的机身卖
如果他们傻到搭卖的镜头也没有马达，顾客不是一用就疯了么
但这些18-55mm一类的镜头实在没有什么特别出彩的地方
将来如果你想买些真正体现和卡片机区别的镜头
很多经典的镜头就不行了，比如特别适合拍人像的 AF-S DX Nikkor 35mm f/1.8 Lens
你如果是不相信d3100没有马达，那么要么去costco再仔细看看包装上怎么写的，要么
看这里
http://en.wikipedia.org/wiki/Nikon_D3100
Like Nikon's other consumer level DSLRs, the D3100 has no in-body autofocus
motor, and fully automatic autofocus requires a lens with an integrated
autofocus-motor.[2] With any other lenses the camera's electronic
rangefinder can be used to manual... 阅读全帖 |
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D*****s
发帖数: 104 | 44 Nikon D90 Camera Body+
Nikon 18-55mm f/3.5-5.6G ED II AF-S DX Zoom-Nikkor Autofocus Lens+
Nikon Zoom Telephoto AF Zoom Nikkor 70-300mm f/4-5.6G Autofocus Lens+
Nikon Normal AF Nikkor 50mm f/1.8D Autofocus Lens+
.45x Wide angle Len+
High Grade Telephoto Converter Lens+
3 Filter Kit +
16GB SD Memory Card+
2 tripods
$1260
这个价格如何？谢谢 |
|
b******n
发帖数: 4509 | 45 Available now for download*1 with versions available for Windows and Mac OS*
2, the free upgrade adds several performance enhancements. Autofocus is now
supported when using the NEX-5/NEX-3 with 14 lenses from the full range of A
-mount optics by Sony and Carl Zeiss that includes telephotos, primes and
zooms. Aperture settings can be maintained during HD movie recording, and
system menu operation has been streamlined alongside other usability
improvements. Registered NEX-5/NEX-3 owners will be a... 阅读全帖 |
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e**n
发帖数: 5876 | 46 啥破网站的东西你也信。乖不得这么偏激。
“A new autofocus mode also applies to Movie mode, called C-AF+TR, which
means continuous AF and tracking. Lock the autofocus system on the main
subject and the autofocus target will follow the subject as it moves around
the frame.”
http://www.imaging-resource.com/PRODS/EPL1/EPL1A.HTM |
|
G**Y
发帖数: 33224 | 47 We offer two of the world's best features to let you capture special moments
faithfully. First, we present the world's fastest autofocus. The phase-
detection AF,
embedded in the newly developed sensor, will track and capture fast-moving
subjects in sharp, crystal-clear focus. Second, we offer the most focus
points in the world. The focal plane phase-detection AF with effectively
positioned 73 points recognizes the moving subject as a plane to ensure that
images are captured clearly. Because of ... 阅读全帖 |
|
f**s
发帖数: 968 | 48 Specifications
Type
Digital, AF/AE single-lens reflex, camera
Recording Media
CF Cards (Type I); Compatible with UDMA CF cards; SD, SDHC, and SDXC Memory
Cards
Image Format
Approx. 36 mm x 24mm (35mm Full-frame)
Compatible Lenses
Canon EF Lenses (excluding EF-S Lenses)
Lens Mount
Canon EF mount
Image Sensor
Type
High-sensitivity, high-resolution, large single-plate CMOS sensor
Pixels
Effective pixels: Approx. 22.3 megapixels
Total Pixels
Total pixels: 23.4 megapixels
Aspect Ratio
3:2 (Horizontal... 阅读全帖 |
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s****h
发帖数: 921 | 49 http://www.mitbbs.com/article_t0/PhotoGear/33861819.html
以前在板上问过。
新买的D90。
镜头是老的。一个定焦，一个变焦的（afs 18-105 1：3.5-6.8GED vr）.
定焦的没问题
变焦的发现没有autofocus。
变焦镜头在朋友nikon相机上测试没问题。
朋友还有一个变焦18-55的镜头，放在我相机上还是没有autofocus。
昨天打了nikon电话，让reset，还是搞不定。
对问题倒是有所发现：
按Menu->autofocus，发现AF-area mode是灰的，被disabled。
选择的话就提示: This option is not available with current setting.
当然，如果把定焦的镜头放上面就不会这样。
可以选择AF-area mode。
折腾了40分钟，Nikon技术人员也不知道咋回事，让我寄过去。
问题是我相机新买的，2月份买的，还没到1个月。
是该退吗？
还是换一个。
在这里买的:www.abesofmaine.com
Thanks |
|
s****h
发帖数: 921 | 50 http://www.mitbbs.com/article_t0/PhotoGear/33861819.html
以前在板上问过。
新买的D90。
镜头是老的。一个定焦，一个变焦的（afs 18-105 1：3.5-6.8GED vr）.
定焦的没问题
变焦的发现没有autofocus。
变焦镜头在朋友nikon相机上测试没问题。
朋友还有一个变焦18-55的镜头，放在我相机上还是没有autofocus。
昨天打了nikon电话，让reset，还是搞不定。
对问题倒是有所发现：
按Menu->autofocus，发现AF-area mode是灰的，被disabled。
选择的话就提示: This option is not available with current setting.
当然，如果把定焦的镜头放上面就不会这样。
可以选择AF-area mode。
折腾了40分钟，Nikon技术人员也不知道咋回事，让我寄过去。
问题是我相机新买的，2月份买的，还没到1个月。
是该退吗？
还是换一个。
在这里买的:www.abesofmaine.com
Thanks |
|
