I am writing this review from the point of view of a (Nikon) dSLR user. My review will consist primarily of reviewing how a dSLR owner would assess the qualities of the Sony NEX-5N, how it fits in and how it can be integrated into an ecosystem where continued ownership of a dSLR is a given. In the process, someone who does not own a dSLR will nonetheless get an understanding as to how the Sony NEX-5N is seen from the perspective of a dSLR owner, and will see its relative strengths and limitations vis-a-vis a dSLR.
SENSOR
The Sony NEX-5N uses a Sony 16mp APS-C sensor that is very similar to the sensor used in the Nikon D7000 and the Pentax K-5, both excellent performing dSLRs. In all respects, my initial testing showed that the sensor in the Sony NEX-5N is almost at parity as my Nikon D7000, e.g., excellent dynamic range at base ISO 100 and excellent S/N performance at ISO 1600, 3200 and even the occasional foray to ISO 6400.
SIZE, WEIGHT, HANDLING AND POCKETABILITY
As a long-time dSLR user now used to the size and weight of a dSLR with its fairly large and heavy weight lenses (e.g., Nikon D700+MB-D10 and 70-200mm f/2.8 VR II lens), the NEX-5N's most startling aspect for me was its small size and light weight. Holding the NEX-5N without any battery and lens, the NEX-5N is so light and compact that it is practically like holding a point and shoot camera, only that it comes with a hefty hand-grip that makes it possible to hold the camera more securely and quite comfortably.
Adding on the battery and the pancake 16mm f/2.8 prime lens adds substantially to its weight and heft but not to the extent as to be objectionable as a light carry compact camera. This combo however is no longer what one would consider as a camera that can comfortably carry in a pocket unless the pocket is in a jacket or cargo/tactical pants pocket. The Sony 18-55mm f/3.5-5.6 is substantially an even bigger package but still fairly light weight.
Despite its decent grip, I highly recommend that one buys a wrist strap for use with this camera. While this camera comes with a shoulder strap, the light weight of this camera makes it very easy and comfortable to carry with one's hand and/or wrist. The wrist strap also ensures that the camera is immediately available for use. A shoulder strap is normally use to distribute the heavy weight of a camera over a bigger area but the light weight of this camera makes a shoulder strap unnecessary. Moreover, a shoulder strap allows the camera to sway and dangle dangerously unless one holds it down. This makes a wrist strap more ideal and convenient.
CONTROLS
The NEX-5N does not come with the many dedicated buttons common to dSLRs but it functions well enough given its compact size and limited buttons. The NEX-5N is controlled primarily either through the touch screen, the rear-rotary dials or a combination of both. The touch screen lags a bit while the rotary dial is fast and instantaneous.
As someone who shoots primarily on Manual Mode and on Aperture Priority, it was fairly easy to set the camera on this preferred mode. Pressing the button above the rotary dial or touching the upper right hand corner of the touch-screen LCD will bring the user to the Menu Option. From there, the Shoot Mode is accessed.
What took a bit longer to find was where the controls are for the shutter and the aperture on manual mode. It is obvious that the documentation that Sony provided with the camera was not designed for an experienced dSLR user but once I figured out where the shutter and aperture mode was on manual mode, it was very easy to set and use.
On Manual Mode, the rotary dial controls the shutter setting. Pressing on the "Down" button shifts the rotary dial control to Aperture and turning the rotary button allows the user to change the aperture setting.
On Aperture Priority Mode, the rotary dial controls the aperture setting and pressing on the "Down" button allows the user to adjust the exposure compensation function.
On both modes, pressing the "Left" button allows the user to change the Shooting Mode (single, continuous, timer, remote, bracketing).
The ISO, White Balance and Metering Mode are easily accessed through the more ponderous menu option. For whatever reason, Sony chose to group these functions under the "Brightness/Color" menu instead of under the "Setup" menu.
Under the "Setup" Menu, there were a few goodies that are worth mentioning. This camera allows the user to choose from 3 grid lines in the EVF. The options available were: Rule of 3rds Grid (3 x 3 grid) , Square Grid (6 x 4 grid) and Diagonal + Square Grid (6 x 4 grid plus an x-grid). In addition, the NEX-5N has an AF Micro Focus Adjustment function. This is a very useful function when using prime lenses - something that the NEX-5N is well suited for.
The NEX-5N has several buttons that can be programmed for various uses when in P A S M Shooting Mode. I used 2 of these for ISO and White Balance. Under the "Setup" Menu", one can proceed to the Custom Key Settings. I then used the Right Key Setting on the rotary dial for White Balance, and the Soft Key B Setting for ISO. I used Custom for Soft Key C and was able to add Metering Mode, AF Mode, Autofocus Area, and AF/MF functions. Ignoring all these details on how to proceed with the setting, suffice to say that under my current setup, I have fast and very easy to shutter, aperture, ISO and WB - the minimum essential controls when using a dSLR.
As an aside, one reason why I have easily adjusted to the NEX-5N's controls is that I currently use different camera models. In contrast to my early experience when I used 2 cameras with similar controls (Nikon D300 and D700) which made switching between one camera to another easy and convenient, I have since sold my D300 and acquired a D7000 to use with my D700, as well as a Nikon D3100, Fujifulm X100 and Panasonic GH2. This change has made me more willing to learn and adopt to the different sets of controls in these cameras. My mindset is essentially that of learning and adopting to the different camera controls rather than one wanting to maintain a consistent set of controls among the different cameras. This background will help the reader to understand why I have no specific objection to the controls of the NEX-5N which is contrary to what a significant number of dSLR owners have complained of.
SHOOTING STANCE
One can take photos with this camera in 3-ways. The first way is handheld, and using its rear LCD screen. The second way is handheld, using an optional viewfinder. The third way is on a tripod, using its rear LCD screen.
Having previously owned several point and shoot cameras (e.g, Panasonic LX-3, Canon S-90, etc.), I am acutely aware of the limitations of the limitations in aiming, composing and focusing while using the camera's rear LCD screen with the arms extended forward. This limitation eventually made me sell these cameras and made me choose the Fujifilm X100 and the Panasonic GH2, both of which features an integrated viewfinder.
So what makes the NEX-5N different? For one, an NEX-5N owner would have the choice of getting the optional electronic viewfinder for this camera. Expensive but otherwise excellent, the EVF gives an owner an alternative of brining a small compact camera with an external EVF, or an even more compact package without the EVF. Moreover, unlike cameras with built-in EVF (such as the X100, GH2 or the Sony NER-7), the optional external EVF in a Sony NEX-5N gives the owner an option to shoot with the EVF oriented 90-degrees upward.
Even without getting the optional external EVF, the NEX-5N has the added advantage vs point and shoot with fixed rear LCD screen because the NEX-5N has an articulated rear LCD screen of the NEX-5N that can be positioned to approx. 80-degrees upwards so that one can aim, compose and focus while looking down and while holding the camera with two hands and with both elbows firmly tucked to one's side. This is an eminently much more stable shooting position than a regular non-articulating LCD screen that requires the user to stretch out his arms, an inherently unstable shooting stance.
Finally, using a tripod, the articulating rear LCD screen makes it easy to aim the camera with no need to activate live view button or switch or periodically pressing live view as the camera automatically shut this down sooner than one would want. The camera can easily be positioned to the level of one's eye or at a lower position and flipped the camera screen upwards.
As a side note, anyone wishing to install a quick release tripod camera plate need to be aware that the NEX-5N may require a specialized adapter plate. Unless the quick-release camera plate is also narrow and slim, the quick-release plate will extend and unnecessarily enlarge the dimensions of this diminutive camera and thus sacrifice one of its advantages and attraction. For now, I am using the same Arca-plate that I am using with the Fujifilm X100 but a customized plate which will conform to better hold and support this camera may be a more ideal setup.
USING 3rd PARTY LENSES
Except for the Sony/Zeiss 24mm f/1.8 and the recently released Sony 50mm f1/.8 OSS (and possibly the Sigma 19mm f/2.8 and the 30mm /2.8), there aren't currently (as of this time of edit, 2012 May 20) many good native E-mount lenses available for use with the NEX System. For this reason, it is inevitable and also advantageous to use one's dSLR lenses on the NEX-5N through an adapter.
I am able to use my Nikon F-mount lenses on the NEX-5N through an adapter. The adapter is almost as large as a Sony 16mm f/2.
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