Review Samsung 45mm f/1.8 2D/3D NX test (aps-c)
The Samsung 45 mm f/1.8 is a bright lens with an NX mount, designed for the APS-C format system cameras of that brand. The special thing about this lens is not just that it is a relatively bright lens with a fixed focal length, but also that, with a suitable body, can make stereo photos. We reviewed the Samsung 2D/3D lens on a Samsung NX300, currently the only NX-body suitable for stereo photography. Of course, we also tested this Samsung lens as we usually do with a normal lens, so that we can make an image quality comparison with other lenses.
Samsung 45mm f/1.8 2D/3D NX @ Samsung NX 300
|The lens is, by the 3D-ability, which is thicker and heavier than you might expect for maybe a fixed focal length lens. There must be room for the 'doors' in the interior, which we'll discuss more later. The design is flawless and fits seamlessly with the NX series, and there's nothing to complain about with the finish either. Very nice. |
The lens features the iFn-system, with which you can control certain functions using the focusing ring. The thought behind it is that you almost never use that ring for focusing, and that you can also use the left hand for the camera operation.
Of course, there is a white and a black version.
Stereo effect with only one lens!
|Stereo cameras have been around almost as long as photography. This is typically done with a camera with two lenses side by side, so those two pictures differ a bit from each other's perspectives. Also, there are sliders where you have a camera with one lens that can shift between two shots a bit to achieve the same effect. With a stereo-viewer in which each eye sees one image, you get the stereo effect. |
The Samsung stereo technology uses the principle that the blurred parts of the image are a bit different when you use the left or right half of the lens. This is the same principle as in phase detection autofocus .
The 45 mm lens has a switch that allows you to (only on a NX300, not on the other NX models!) back and forth between 2D and 3D. In the 2D mode, it works just like any other lens fixed focal length lens. In the 3D mode, two transparent screens slide from the sides of the lens. Those can be made opaque electronically. By first capturing an image with the 'right' window blinded screen and then one with the 'left' window blinded, you get two shots with different perspectives. The stereo basis is obviously not great because the lens opening is less than two inches. The principle also works on film, because the screens can be changed at lightning speed (60 per second) from 'open' to 'closed' and back. The stereo effect is visible on a TV screen when using 3D glasses. The TV projects alternating the left and right images; the glasses are synchronized with the screen and allow you to watch with one eye. On the photo here, you see the two 'valves' in the lens. Using the lens in 2D mode, then those are stored in the lens housing.
|In the 3D mode the NX300 saves two files for each shot: a 'normal' 2D JPEG (this turns out on closer inspection to be the left image) and a file with.an MPO file extension. Those files you can view in 3D on a suitable television with the accompanying 3D glasses. Not on the computer! Photoshop will not open the MPO files. We tried various software programs and eventually 'cracked' the files with 'StereoPhoto Maker' (free download from Chip.de). There appear to be two JPEGs in each MPO file, of which the 'left' is identical to the JPEG file that the camera stores. The largest image size is 2688x1512 pixels (4.1 MP). The MPO file format is a so-called open standard, which can be used in principle by all manufacturers. Converting the two JPEGs to a 1920x1080 pixel TV picture is only done in the television. Whether the NX300 files also work in other 3D TVs than that of Samsung, we have not studied. The manual does not mention this. |
The camera when shooting in 3D largely takes control. All shots are made at f/6.0. That's not a 'real' aperture, because you're only half the lens surface is used, you immediately lose a stop, and the light transmission of the doors also won't be 100%.
We photographed the electronic stopwatch on our computer screen. If you put the two JPEGs next to each other, then it turns out that the time interval between the two shots is about 30 milliseconds. See the picture in the upper right. With this brief interval, you cannot capture excessively moving subjects in stereo. We also made a shot of the lighting fixture above our workplace, with the background of a white lace curtain (on the right and bottom right). It is clear that the position of the light box compared to the folds of the curtain in the two shots is different. That difference gives the stereo effect. It is, in view of the small stereo base, only really observable for objects at close range.
Is the stereo effect for 'still-photography' worthwhile? We do not know. The picture on the TV picture looks somewhat crumbly; it is of course highly compressed because a TV screen doesn't have many image pixels. In addition, are you bound to a horizontal image format. The real profit when working in 3D is probably when filming, but that was not part of this test.
|Although the attention in this lens is especially on the stereo-option, is the normal (2D) a very good standard-lens. Do note that the focal length of 45 mm (KB-equivalent 67 mm) might not be to everyone's taste: too long for an all-round lens or for landscapes, too short for a portrait lens. |
The sharpness earns the score "very good" as long as it's 2-3 stops apertured. At maximum aperture only the center is really sharp. And yet even in the extreme corners at maximum aperture there's a resolution of nearly 1500 lines per picture height.
|The vignetting is extremely low over the full range, and in practice as good as invisible. In the JPEG mode it's clear that some vignetting correction is applied. |
|The distortion in RAW is very noticeable, but very low in JPEG files. |
The distortion in RAW is very noticeable, but very low in JPEG files.
Conclusion Samsung 45mm 3D review
See our list of tested lenses to compare the performance of this lens to other lenses.
|WYSIWYG score: This table shows the performance of this lens when you store the files in the camera as jpg, with all available in-camera lens corrections applied. This score gives you for this lens/test camera combination: "What you see is what you get". |