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y*b
发帖数: 3190 | 2 (SR5) These are the four Sigma lenses that will be announced at Cp+
135mm F1.8 DG HSM | Art
14mm F1.8 DG HSM | Art
24-70mm F2.8 DG OS HSM | Art
100-400mm F5-6.3 DG OS HSM | Contemporary
zz from SAR, also NR, CW |
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l**n
发帖数: 67 | 3 I guess most of the people have seen the picture of
the image of faraway stars which are gravititionally
lensed by an intermidiate star. But i notice that
in most of those pictures taken with Hubble telescope,
there are only two or four images of one star. I don't
know what caused this that we can only see discrete
number of images. Sometimes i do see continuous images
which appear as an arc. In my mind the image should appear
as a ring if not a circle. Who has any idea? THX |
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w*******y
发帖数: 60932 | 5 There's a new instant rebate for Canon lenses and flashes. It's a double
rebate if you purchase an HD camera (1D, 5D, 7D, 60D) at the same time.
Here's a link to the rebate poster: Link:
. You can also check out www.canonpri cewatch.com:
http://www.canonpricewatch.com
(where I hotlinked the poster from) which has a list of rebates plus the
post rebate street prices.
For those who followed the last 7D rebate fiasco (http:// et/forums/sh... =2273253), it looks like Canon did NOT raise the MSRP ... 阅读全帖 |
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w*******y
发帖数: 60932 | 6 Canon Rebel XS 10.1MP Digital SLR Camera with 18-55mm IS & 55-250mm IS
Lenses + Tiffen 58mm UV Filter$965
$506.99 Free Shipping After Coupon & Rebate at Amazon.com posted about 2
hours ago
Use Amazon.com coupon code 5525OOCT during checkout.
Amazon is offering the lowest price we can find anywhere on this bundle.
Just the camera alone sells for $549.99 at Buy.com. If Amazon is not pre-
selected when you click through, look under more buying choices. Follow the
directions below to get this dea... 阅读全帖 |
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w*******y
发帖数: 60932 | 7 Abe's of Maine has the Pentax K-X kit with 18-55 and 50-200 Lenses for $583
delivered.
Link:
http://www.abesofmaine.com/item.do?item=PNKX2LK
This is a great camera, I think, at the best price I could find.
Happy shopping!
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w*******y
发帖数: 60932 | 10 My first so be kind folks. Been looking for a deal on this camera.
Currently, Staples has the camera kit (14-42mm lenses + extra battery +
camera bag + video tutorial dvd + extra savings booklet) on sale for $449.99
Link:
http://www.staples.com/Olympus-Pen-E-PL1-Digital-SLR-Camera-Kit
If you then look at the online weekly ad, the first page will present you
with a coupon for the week for 15% off any non-computer in-store purchase (
code: 72507 expires 1/29)
After applying the 15% off coupon, o... 阅读全帖 |
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w*******y
发帖数: 60932 | 11 $8.88 per Box 32 delivered
there are no additional Shipping charges
Minimum 2 box order
No prescription verification
Daily Disposable Contact Lenses Link:
http://www.daysoftcontactlenses.com
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w*******y
发帖数: 60932 | 12 Amazon
Olympus LSH-1220 Lens Case for Olympus 50-200mm & 150mm f/2.0 Lenses
$14.57
Shipping is free with Amazon Prime or if you spend $25 or more
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w*******y
发帖数: 60932 | 13 Please read this post before you give thumbs down or thread crap.
Warby Parker makes really nice prescription eyeglasses that you actually
would want to wear and you don't have to gamble on whether they fit. The
problem with Zenni, Coastal Contacts, and the other online stores is finding
a good looking pair of glasses that ACTUALLY FIT.
With Warby Parker, they will send you up to five pairs of glasses to try on
at home for 5 days for free and will include a pre-paid return shipping
label to send... 阅读全帖 |
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w*******y
发帖数: 60932 | 15 pretty good deal for summer
Kenneth Cole Aviator Sunglasses with Gradient Lenses and 100% UV Protection
in Black, Gunmetal Gray or Gold!
List Price $129.99
Savings $120.00 (93%)
Price: $9.99 + 5 shipping
1saleaday.com
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g******y
发帖数: 2517 | 17 Save Big When You Bundle Select Canon DSLRs with Qualifying Canon Lenses and
/or Printer
http://amzn.to/rKDOTN |
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w*******y
发帖数: 60932 | 18 Free Lenses
Free Anti-Scratch Coating
Free Full UV Coating
Free Protective Case
Free Microfiber Cleaning Cloth & Tool
90-Day Money Back Guarantee
Use code: OneDollar at check out
Only $1, ends Feb 29th. (You will save $159 this time.)
LINK:
http://www.glassesshop.com/onedollar?utm_source=slickdeals&utm_
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g******y
发帖数: 2517 | 23 Save up to $500 on Select Canon Lenses with Qualifyig DSLR Cameras
http://amzn.to/LDsZlK |
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q*c
发帖数: 17993 | 25 REI的这篇文章挺好，针对滑雪Goggle的选择，我转贴过来：
http://www.rei.com/learn/expert-advice/goggles.html
Goggles for Skiing and Snowboard: How to Choose
/How%20to%20Choose%20Ski%20and%20Snowboard%20Goggles.jpg
Goggles offer you better eye protection than sunglasses do when you're
snowboarding or skiing for the day.
At first glance, it may not be apparent why goggles range so widely in price
—from $25 to over $200. Here's how to make sense of the technology and find
the right pair for your needs.
Why Wear Goggles?
Th... 阅读全帖 |
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发帖数: 1 | 26 Yarmouth Port, Massachusetts
From Wikipedia, the free encyclopedia
Yarmouth Port, Massachusetts
Census-designated place
Boardwalk at Bass Hole
Location in Barnstable County and the state ofMassachusetts.
Coordinates: 41°42′17″N 70°13′15″WCoordinates: 41°42′17″N 70°13′
15″W
Country United States
State Massachusetts
County Barnstable
Town Yarmouth
Area
• Total 6.47 sq mi (16.76 km2)
• Land 6.04 sq mi (15.65 km2)
• Water 0.43 sq mi (1.11 km2)
Elevation 52 f... 阅读全帖 |
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发帖数: 1 | 27 在网上发现了一个圣诞节商店，商店的建筑很有特色，而且遍布全美国，大概有70多个
店铺，以后大家买圣诞节用品可以去那里，似乎各州都有。我们这里和麻州的地址是：
CHRISTMAS TREE SHOP AUGUSTA, GA, 239 ROBERT C. DANIEL JR. PARKWAY,
AUGUSTA EXCHANGE, AUGUSTA, GA 30909, 706.738.0570, CHRISTMAS TREE SHOP
, MAGNOLIA PARK, 1117 WOODRUFF ROAD, GREENVILLE, SC 29607. 864. 297.
3667
CHRISTMAS TREE SHOPS NATICK, 1298 WORCESTER ST. ROUTE 9, SHERWOOD
PLAZA, NATICK, MA 01760, 508.655.9800
CHRISTMAS TREE SHOPS SOMERVILLE, 177 MIDDLESEX AVENUE, ASSEMBLY SQUARE
... 阅读全帖 |
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w***a
发帖数: 313 | 28 http://sploid.gizmodo.com/this-is-what-425-659-59-in-camera-gea
Here's the list:
20 Canon 1Dx cameras
3 Canon 5DmkIII cameras
1 Canon EF 100mm f/2.8L IS USM Macro lens
2 Canon 14mm fisheye lenses
2 Canon 15mm fisheye lenses
5 Canon 16-35mm zoom lenses
7 Canon 200-400mm zoom lenses
2 Canon 200mm f/1.8 lenses
2 Canon 300mm f/2.8 lenses
2 Canon 300mm f/4 lenses
2 Canon 35mm f/1.4 lenses
2 Canon 50mm f/1.2 lenses
2 Canon 400mm f/2.8 lenses
8 Canon 500mm f/4 lenses
10 Canon 70-200mm f/2.8 lenses
7 Ca... 阅读全帖 |
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z***i
发帖数: 1122 | 29 • 20 Canon 1Dx cameras
• 3 Canon 5DmkIII cameras
• 1 Canon EF 100mm f/2.8L IS USM Macro lens
• 2 Canon 14mm fisheye lenses
• 2 Canon 15mm fisheye lenses
• 5 Canon 16-35mm zoom lenses
• 7 Canon 200-400mm zoom lenses
• 2 Canon 200mm f/1.8 lenses
• 2 Canon 300mm f/2.8 lenses
• 2 Canon 300mm f/4 lenses
• 2 Canon 35mm f/1.4 lenses
• 2 Canon 50mm f/1.2 lenses
• 2 Canon 400mm f/2.8 lenses
• 8 Canon 500mm f/4 lenses
R... 阅读全帖 |
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c*******d
发帖数: 1172 | 30 Attractive offer for filmmakers and filming photographers in entry-level HD
video segment
OBERKOCHEN/Germany, 05.04.2011. During the NAB Show in Las Vegas from April
9-14, 2011, Carl Zeiss will introduce an attractive bundled lens set offer
for its SLR lenses. The set contains the following lenses with F (ZF.2) or
EF bayonet (ZE): Distagon T* 2,8/21, Distagon T* 2/28, Distagon T* 2/35,
Planar T* 1,4/50 and Planar T* 1,4/85. This offer is a response to the
strong demand from the HD Video segment ... 阅读全帖 |
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f****a
发帖数: 847 | 31 测评还不赖，可是bokeh不好玩
http://allphotolenses.com/lenses/item/c_2210.html
Mechanical quality 4.00 1
Optical quality 4.00 1
Usability 4.00 1
Pricing / Value 5.00 1
Bokeh 3.00 1
Overall lens rating
4.00
I think only Osawa built some lenses for the Mamiya CS or E mount. This
lenses was sold under different brand : Bell & Howell (which was property of
Osawa itself), Omestar, Quantaray, Revuenon, Soligor and peharps others.
The Revuenon is a special case as th... 阅读全帖 |
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i***f
发帖数: 10682 | 33 他的意思大概是，Canon的Body比Sony的差很多，Canon的镜头和Sony基本一样多而且很
多是重复建设的。。。
“Tired of hearing the endlessly and tiresome song “The A-mount has a very
limited number of lenses; I would wish to post this comparison, so everybody
could speak knowingly.
Debunking myths… if only a little
It is a truth repeated and accepted by everybody that Sony lacks the breadth
of catalogue of Canon or Nikon. And that is often used when evaluating the
Sony products: “Yes, it could be a good camera, but when you need to make
grow ... 阅读全帖 |
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f*****g
发帖数: 3086 | 34 研究了一下manual，发现5D2跟7D的中心点对焦在小于F2.8时应该是一样的，
两者在F5.6时都是中心十字（非高精）对焦。
可能的区别是在F2.8时，7D中心应该是双十字高精对焦（5D2是十字高精）。
所以在7D或5D2上用xxb, 540等一系列F4.0的镜头，两者对焦精度应该一样，
只有1D系列机身，在F4仍然是高精对焦。
所以，镜头最大光圈小于F2.8并只用中心对焦的时候，在5D2和7D难道不是一样的？
除非我还miss了什么。
以下摘自Canon manual
【【5D2】】:
【With lenses whose maximum aperture is larger than f/5.6】
With the center AF point, cross-type AF (sensitive to both vertical and
horizontal lines) is possible. The remaining eight AF points are
horizontal-line sensitive or vertical-line sensitive.
【W... 阅读全帖 |
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T*******I
发帖数: 5138 | 35 http://www.dantestella.com/zeiss/resolution.html
Resolution of camera lenses where are the limits – and why?
Some users of Zeiss lenses are so enthusiastic about these optics that they
believe Carl Zeiss can do won-ders. Well, this is not exactly true. The fact
is: Carl Zeiss has to adhere to nature's laws just as anybody else. So far,
Carl Zeiss's physicists have found no way around it.
One of these laws defines the resolution limit of any optical system, any
camera lens, even a perfect one wit... 阅读全帖 |
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n**b
发帖数: 13203 | 36 DO NOT USE ANY OTHER LENSES, ESPECIALLY LEICA, IN THE RANGE FROM 18mm ~ 60mm.
You can't get better than Fuji's lenses, and other lenses, even awesome
LEICA lenses,won't autofocus or open and close their diaphragms for you as
you shoot and focus.
With other lenses, manual focus might not be that much of a problem, but you
'll have to open and close the aperture by hand every time you want to focus
or shoot or focus. Forget other lenses except for the 12mm Voigtl?nder for
ultrawide, or longer lens... 阅读全帖 |
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h****9
发帖数: 381 | 37 ＊＊＊ SALE或COUPON专贴，请JMs将有关信息贴这个专贴里，以方便大家查找 ＊＊＊
＊＊＊ 请JMs存下这个贴子的链接，我会尽量每周都来更新，如果大家看不到这个贴子，我更新就没有意义了。 ＊＊＊
只是想跟JMs说明一下，为了方便大家查找，我答应版版MM帮助收集和整理我所
知道的以及JMs提供的COUPON/DEAL信息，我会尽量及时更新coupon专贴的主贴，
也欢迎更多JM将coupon贴在这个贴子里，在此一并感谢所有提供COUPON/DEAL
信息与大家分享的JMs，并感谢在COUPON专贴出问题时给予我很大支持与帮助的steedzhu、BelugaWhale及brightsmoo几位版版MM。
除了某些 BRU/TRU COUPON可能是扫描件以外，其它基本上都是printable coupons，请需要的JM用链接打印啊。JMs可以在文摘区找到更多coupon信息
包括交换等信息(请从首页找起)。
★ 有JM问起，觉得这个贴子太长了，慢的原因可能是图片太多，我将图片显示出来是想方便JMs很快找到自己想要的DEALS(我可以将图片略去，如果更好的话)。简介一下主贴的内容啊... 阅读全帖 |
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c******r
发帖数: 3778 | 38 OVERNIGHT CORNEAL RESHAPING (OCR) — Overnight corneal reshaping (OCR) is
the process of wearing a specially designed, rigid gas-permeable (RGP)
contact lens while asleep to temporarily effect a change in the corneal
curvature resulting in clear vision during waking hours without correction.
This technique is also referred to as:
●Corneal refractive therapy (CRT)
●Overnight corneal reshaping (OCR)
●Vision shaping treatment (VST)
●Orthokeratology (Ortho-K)
The process — After wearing OCR lenses, t... 阅读全帖 |
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N*****e
发帖数: 2573 | 40 I bought my A7ii here on Amazon and got it the first day of release. In this
review, I'm going to assume you know the basics about the A7 series, and go
straight to the pros and cons of the new camera.
PROS
*In Body Steadyshot - This is the marquee feature and for good reason. Now
ALL of your lenses have image stabilization - including those 40-year old
Nikkors and Leicas. It's amazing and it works. Of course the stabilization
is more helpful with lenses towards the telephoto end of the spectrum... 阅读全帖 |
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i*********5
发帖数: 19210 | 41 http://www.bicycling.com/bikes-gear/new-bike-gear-previews/8-gr
OAKLEY RACING JACKET
Available in six frame colors, each with two lens options (shown: polished
white frames with violet iridium and light grey lenses); Switchlock
technology makes lens-changing a snap—literally; removable retaining strap
keeps these shades on your face when things speed up.
Price: $220
http://oakley.com
RYDERS VIA PHOTOCHROMIC
Photochromic lenses automatically adjust to constantly changing light
conditions; lenses ... 阅读全帖 |
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f**s
发帖数: 968 | 42 链接在此：
http://www.kenrockwell.com/tech/8mm-f35.htm
8mm f/3.5 Fisheye
Pro-Optic, Samyang, Rokinon, Bower &c. (2009-)
© 2010 KenRockwell.com. All rights reserved.
Intro Specs Performance Compared Recommendations
8mm f/3.5 Fisheye, Pro-Optic Nikon AI-s version. enlarge. ($290, Korean, no
filters, 13.8 oz./391g). This one came from this link to it at Adorama (also
specifically in Nikon, Canon EOS, Pentax/Samsung and Minolta Maxxum/Sony
mounts). It also comes branded as Bower, also specif... 阅读全帖 |
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h****e
发帖数: 2153 | 43 They are superb and good lenses and I totally agree with that. They are only
superb optically, and most of them are able to be adapted to EF camera. For
foto fans, the Leica or Zeiss tele lenses are very inconvenient
mechanically, since the tele lenses are much more relied on the mechanical
properties, especially zoom, IS and AF, compared to Wide angle and portrait
lenses. So, for adapt old lenses to Canon system, Wide angle and portrait
lenses are much more meaningful than tele lens. For tele l... 阅读全帖 |
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m********l
发帖数: 6748 | 44 去他的网站看即可，摘录如下。基本上便宜的adapter就上100块的Fotodiox，否则就是
400块的Metabones IV。 二楼是Sigma，三楼是Tamron。
CANON EF PRIMES
Canon EF 14mm f/2.8L II USM Lens
Metabones: Fast and accurate PDAF AF-C and AF-S with Wide, Center and
Flexible Spot
Fotodiox: Fast and accurate PDAF AF-C and AF-S with Wide, Center and
Flexible Spot
Viltrox: Fast and accurate PDAF AF-C and AF-S with Wide, Center and Flexible
Spot
Canon EF 20mm f/2.8 USM Lens
Metabones: Fast and accurate PDAF AF-C and AF-S with Wide, Center and
Flexible Spot
Fo... 阅读全帖 |
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s****r
发帖数: 31686 | 45 无知，惊人的！ 不是下身的问题，你该看脑科了
随便谷歌一下，看见这条非权威答案，但是有道理：
Read forum faster on mobile. Get the Free Tapatalk app?
FREE - on Google Play
VIEW
← Sony Alpha Full Frame Lenses
Sony Alpha Forum
Does the Sony FE 24-70 f/2.8 GM support ph...
Like This
Packafoma28 Sep 2016
I recently purchased an a7R II along with a Sony FE 24-70 f/2.8 GM lens (
SEL2470GM). I bought the lens on eBay. It was listed as manufacturer
refurbished and does appear to be genuine and in excellent condition.
Both the came... 阅读全帖 |
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b***y
发帖数: 14281 | 46 既然有人争论方的学术水平，就上网搜了一下。应该说这个水平对于一个junior
faculty来说可以算是很牛B了，但是对于老方这种senior的已经搞了一辈子的人来说，
就只能算so so。不要说是院士，离aps fellow的级别也还差了不少。引用率最高的一
篇文章还是95年到了arizona之后跟老外合作的，被引118次，这也是方唯一一篇被引用
上百次的文章。可见方励之89之前确实没有做出过什么重要的工作，他的名声和地位绝
对是靠政治得来的，当然其中部分的也是80年在中国搞科普所得，必须承认科普工作也是
有重要的社会意义的。
(BTW，有人说你这个搜索未必完整。不错，确实不能保证100％毫无遗漏。但是我
用的search engine is THE search engine everybody in this community uses today.
So, if any article is not found by this search engine, sadly, it simply doesn't matter,
because no one would ever n... 阅读全帖 |
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m********l
发帖数: 6748 | 47 值得一看，他自己是用D800E和E-M1的，各种对比也很实在。 如果要对比A7R的AF的话
，和E-M1比较，那么按1-10 scale来说：
对焦速度：Oly 10， A7R 6
对焦精度：Oly 9， A7R 6
追焦： Oly 7， A7R 5
acquisition time: Oly 10, A7R 7
blog.mingthein.com/2014/01/08/sony-a7r-review/
其他的summary：
Vs Nikon D800E: Here, it all boils down to the system of lenses and flashes:
if you need any special purpose gear at all, or longer lenses, then the
balance tips heavily in favor of the D800E. I think the shooting envelope is
a bit wider, too – given the much better shutter mechanis... 阅读全帖 |
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n****s
发帖数: 150 | 48 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:
Glowing UV Contact Lenses Kit
Kit includes
• 1 x Pair of Green UV Contact Lenses in factory sealed box (made in
Europe)
• 1 x Cosmetic Contact Lens Storage Case
• 2 x Solo Color of UV Body Paint (RED and Purple)
单张面值:
$45
可接受价格(必须明码标价！):
$45
物品新旧要求:
new, sealed
邮寄方式要求:
UPS ground
my lable
付款方式说明:
non-cc paypal
其他补充说明:
This UV contact lenses glow brightly and completely cover your natural eye
colour. These contact lenses have a solid colour a... 阅读全帖 |
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n****s
发帖数: 150 | 49 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:
Glowing UV Contact Lenses Kit
Kit includes
• 1 x Pair of Green UV Contact Lenses in factory sealed box (made in
Europe)
• 1 x Cosmetic Contact Lens Storage Case
• 2 x Solo Color of UV Body Paint (RED and Purple)
单张面值:
$45
可接受价格(必须明码标价！):
$45
物品新旧要求:
new, sealed
邮寄方式要求:
UPS ground
my lable
付款方式说明:
non-cc paypal
其他补充说明:
This UV contact lenses glow brightly and completely cover your natural eye
colour. These contact lenses have a solid colour a... 阅读全帖 |
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i******e
发帖数: 1720 | 50 这比较难说。我的理解是，custom design 是指医生量了你的眼球然后去设计弧度/深
度等等。 generic design是指量了你的眼球然后去从现有的设计中选适合你眼球的。
下面这段是从我医生给的info考来的，当然一面之词，仅供参考。
The lens that we use is a "custom" design using Boston's FDA approved
overnight rigid gas permeable material. All Ortho-K lenses must use FDA
approved materials. I categorize Ortho-k lenses into two categories: 1)
generic design lenses 2) custom design lenses. Generic lenses such as C.R.T.
limit the customization of the fit whereas custom lenses allow the doctor
to contour/... 阅读全帖 |
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