SONY NEX5，是否会成为从小DC升级的一个新选择？

在陆地上火热的微电系统，终于也可以下水了，对于不愿意承担单反昂贵价格和体积重量但是又希望能够得到更好画质的人来说，这应该是一个值得认真考虑的选择。

Aquatica和Nauticam最近都推出了各自针对NEX-5设计的housing，从外观看更喜欢Nauticam，感觉他的配件似乎也较Aquatica多一些。不过Aquatica有一个很好的设计，有效利用了NEX-5可以翻转屏幕的特点，把LED位置观察窗做成带角度倾斜的，方便观察。

两个厂家housing的介绍如下：
http://aquatica.ca/en/products_dslr_an5.html

http://nauticam.com/product.asp?id=101

厂家试拍样张地址：
http://nauticam.smugmug.com/HousingTests/NA-NEX5-test-w18-55-Cebu-Aug/15322039_bwNwMt#1146515640_JGEXj

关于NEX-5相对小DC水下拍摄的优势，从imaging resource上摘抄部分如下：

1、可换镜头，终于可以有专有的微距和广角头可用了（SONY原产镜头质量比CANON红圈还略弱了一些，虽然可以通过转接环把蔡司徕卡的各种牛头装上去，但是在水下没有自动对焦，跟废了武功差不多，希望将来能有所改观，即使这样，镜头上和小DC比，提高也是飞跃级别的）
2、接近单反系统的对焦速度，连拍可达7fps，对于水中拍摄活动的物体来说，有小DC无法比拟的优势（至少用G9，我从来没成功微距在F2.8时准确的对到一条nemo上）
3、NEX-5拥有和7D同样大小的CMOS，几乎是G系列相机的15倍，可以这样理解，拍同样大小一只海兔，可以使用15倍于G12的底片来表现海兔的细节，更不用提色彩宽容度、抗噪上的提高。
4、支持高清视频拍摄（由于没后期能力，拍了也是空占着硬盘空间，没自己研究功能强大与否，希望有熟悉的朋友能介绍一下）

相对大象来说，无论镜头的可选程度还是机身的性能都有不小的差距，但实在是体积小啊！！！和可拍出相片的素质比起来，体积可以说是值得骂娘的小！在网上找了价格算了下，配上单灯拥有成本应该在3万左右，和大象的比起来，成本优势非常明显。

NEX-5 + 16mm F2.8 + VCL-ECF1鱼眼转换器 ＋ 30mm F2.8 Micro＝3200＋1000＋1000＋2600＝7800
Nauticam NA-NEX5 Housing +E mount 4.33" fisheye port + EA30 port for Sony LA-EA1 and SAL 30m f2.8lens =10500+3000+2000=15500

评测原文：

http://www.imaging-resource.com/NEWS/1285012325.html

PRESS RELEASE: Nauticam NA-NEX5 Housing for Sony NEX-5

Innovation Underwater

Nauticam proudly announces the NA-NEX5 Housing for the Sony NEX-5. This camera and housing package offers image quality traditionally only available from much larger SLR systems and ease of use previously found only in compact systems.

Sony NEX-5
Sony’s NEX-5 is a ground breaking camera, one of the first of a new generation of digital cameras, commonly known as EVIL (Electronic Viewfinder Interchangeable Lens). These mirrorless cameras feature a DSLR sized sensor and interchangeable lenses in a body sized more like a point & shoot camera. The NEX-5 camera is half the size, half the weight, and much simpler to use than traditional DSLR cameras. Its interchangeable lenses allow exceptional flexibility in various shooting situations. Full HD Video (1080/60i), with on demand autofocus, is also included, making this one of the most fully featured and versatile compact systems available today.

NEX-5 offers much faster shutter response than current compact cameras, and autofocus nearly as fast as the best SLR systems. Continuous shooting speeds up to 7 fps allow fast action capture, making it ideal for fast action capture, both on land and underwater.

The primary reason for NEX-5’s superior image quality is its larger image sensor. The APS-C sized sensor (approximately the same size as Nikon D300s and Canon 7D) has 9x the surface area of the Canon G11, and 15x the surface area of the Sealife DC1200. Larger sensors mean larger photo sites that yield superior low light performance and greater dynamic range.

NauticamNA-NEX5 Housing
Nauticam engineers started with a clean slate for their first compact camera housing. Innovation, ease of use, and ergonomics were their #1 priority. The result is an amazingly compact housing, with all ofthe NEX-5 camera controls available from the ergonomic grip sculpted into the side of the housing. The Nauticam patented locking port release system has been incorporated (with a retro styling twist, paying homage to Nikonos systems), allowing easy and secure port changes.

The camera is quickly mounted in the housing via a snap in camera tray, and the housing is securely closed with a clasp featuring double safety release buttons. The compact form factor and outstanding low light performance make this a perfect system for technical divers exploring extended range environments.

A wide variety of lenses are available to the NEX shooter, including the ultra wide fisheye perspective from Sony E 16mm /2.8 + VCL-ECF1 Fisheye Converter, the versatile E 18-55 Zoom Lens for fish portraits and closeup photography, and highest resolution super macro results attainable using a Nikonos lens with extension tubes.

Angled LCD Display
The large 3” NEX-5 Display can be angled up at approximately 15degrees allowing easier composition and more comfortable diving posture. The angled LCD greatly enhances perspective when shooting low subjects, and facilitates an upward shooting angle for blue water backgrounds.

Patented Port Locking System
With a salute to the past, Nauticam’s Locking Port Release adopts Nikonos system styling cues, and quickly allows port optics or adapters to be changed with no twisting or threading, minimizing the possibility of o-ring extrusion. Fast. Simple. Secure.

Double Safety Housing Clasp
The housing back is sealed with an easy to operate safety clasp. Dual safety buttons eliminate the chance of accidental opening.

Nauticam Build Quality
Only the finest materials and cutting edge manufacturing processes are used to make Nauticam housings. The housing body is machined from solid aircraft grade aluminum, then hard anodized making it impervious to salt water. Marine grade stainless steel is used in all fasteners. Nauticam flat ports are optically coated glass, and the optional 4.33” dome port is an optical grade acrylic. The large acrylic LCD window is treated with an anti-reflective, scratch resistant coating.

Optional Rubberized Ergonomic Handles
Nauticam uses a sophisticated overmold process to produce extremely comfortable rubberized ergonomic hand grips. The soft feel and ergonomic design make the housing easy to grip and minimize hand fatigue on long dives. Both single and double handle configurations are available for complete customization, and each handle can be adjusted laterally allowing the user to dial in perfect fit.

Optical Flash Connectors for Inon S-TTL, and Sea & Sea DS-TTL
Reliable automatic flash exposure is available with Nauticam housings and a variety of optically fired flashes. Inon Z-240, D-2000, S-2000, Sea & Sea YS-110 Alpha, and YS-01 strobes provide automated lighting, precisely reproducing the camera’s onboard flash at a proportionally greater intensity. This system yields accurate TTL flash performance with no electrical sync cables to flood!

Nikonos V Len Support
One of the unique advantages of a mirrorless system is that almost lens can be used via an adapter. One of the options this makes possible is an adapter for the heralded Nikonos U/W Nikkor water contact range finder lenses. While the Sony E- mount lenses offer excellent optics and autofocus performance, the Nikonos lenses yield incredibly sharp images.

Specifications

Depth Rating: 100m (E18-55 Port 75m)
Dimensions: 164mm x 118 x 83mm
Standard Features

Patented Locking Port Release Lever
Super Sensitive Shutter Release
Optical Strobe Connectors
M10 Threaded Hole for Strobe Attachment
Cold Shoe for Accessory Mounting
Embossed Control Function Labels
Quick Release Camera Mounting Shoe
Complete Access to All Camera Controls
Optional Accessories

4.33” Dome Port for Sony SEL16F28 16mm + VCL-ECF1 Fisheye Conversion Lens, #36125
E18-55 Port for Sony 18-55 F3.5-5.6 Zoom Lens, #36121
E18-55 Zoom Gear for Sony 18-55 F3.5-5.6 Zoom Lens, #36122
Pancake Flat Port for Sony E 16mm, #36124
67mm Closeup Lens Holder for Macro Photography with E18-55 Port, #36123
Nikonos U/W Nikkor Lens Adapter, #36201
Tray with Left Handle, #36311
Right Handle, #36312
USA Retail Price, $1550

Estimated Shipping Date, September 27

Nauticam NA-NEX5 Housing
for the Sony NEX-5

题外话：没有研究NEX的镜头组，不知道是不是出自蔡司之手，目前可选不多，只有18-55mm， 16mm， 30mm，好在对于水下使用体裁明确，16广角，30微距两个应该够用了，有点遗憾30mm＊1.6以后也只有48mm，拍小虾小蟹之类的容易惊吓到小动物，不如百微，可以离很远拍。