After the first test market Sony SLT A55 by translucent mirror water temperature to be recognized, in the months before the launch of the high-end positioning in the A65 and A77 models. However, as a successor to the entry-level rtc A57 has until recently been launched. Judging rtc solely from the parameter A57 and A55 predecessor did not seem much different, almost rtc the same 16.1-megapixel sensor, 15-point AF system phase, 1,200-zone metering and 100% field of view viewfinder (EVF viewfinder is not difficult to achieve this) . At first glance it seems that the only difference between the change in body size, do not really just a shedding A57 version A55 it? Let's take a look inside the following evaluation, in the end there is a change in those areas.
As a semi-permeable reflector models (SLT) DSLR body with the other most obvious difference is that it's EVF viewfinder mode. Compared with the A55, A57 EVF achieve tangible piece above 144 million pixels, and have two modes is adjustable for different use of the crowd, it can have a different point of view finder far, the concept says simply, that is, when can see the entire viewfinder eye to the viewfinder when the maximum distance. After adjusting far viewpoint rtc can reach 25.2 mm, very good value, and friends who wear glasses should be like this feature. Original performance piece on the A55's EVF is also fairly satisfactory, at A57 above its magnification becomes 1.04 times from 1.1 times, but the actual use is still feeling the greatest change in the viewfinder fluency Shanghao a lot, every time shoot a picture does not appear the case of a black screen and the viewfinder can be very smoothly continue to prepare rtc for the next shot, this experience has been very close to the traditional OVF. Sophistication on the screen is also very good, there is no pixel grainy. rtc But let us not satisfied with two aspects, one is immediately after turning on the viewfinder, there is a clear picture from dark to light in the process, although this process can still be normal shooting, but the duration is very short, rtc but in When capturing still feel some inconvenience; the other is not the A65 it uses the above specifications staggering 2.36 million pixel XGA OLED EVF, but similar to DLP technology, namely red, blue and green three colors each displaying only one By high-speed refresh rate to achieve color mixing, rather than a simultaneous rtc display of three colors, to say the advantages of it, can be more delicate details of the performance, but the disadvantage is that occasionally some dynamic scenes or angle to see the rainbow-like edge, from time to time to remind you that this is EVF, not OVF .......
Features A57 main body of the function is its high-speed continuous shooting 12Fps relative to the A55 10Fps, considered a relatively easy to find upgrades. rtc In this mode, the focus will be locked at the moment you press the shutter and aperture will be fixed at the most, but also goes about 8.4 million pixels, note that this is the time to take advantage of the central part of the photosensitive element, in other words , frame smaller, resulting in the equivalent focal length and framing perspective will change. Entire shooting in fine photo quality up to shoot 23, that two seconds or so, then the body will take some time to write the image cache, you need to wait for some one shot to the next. Frankly, rtc the number of shooting into a 12 by 10 in fact do not have much sense, after all, to limit this shooting mode find many degrees of freedom is very low. Continuous full pixel 10Fps normal state is not in question, you can automatically AF, you can set the aperture and so on. A57 tracking AF performance in the entry-level body in the performance is not bad, and the success rate is relatively high. Semitransparent reflective reflector device structure is fixed (you can manually lifted after opening the lens), rtc no action at the time of the shooting, so you can easily rtc do many professional level comparable to the fuselage ultra high-speed continuous shooting speed, and it is due to Only the focal plane shutter curtain operates its shutter vibration is also very mild, although it looks like there is no lens shutter silent, but the body stable shooting is done without any problems, unlike rtc some DSLR machine Once the high-speed rtc continuous shooting type, as if the hands of the machine as in the tremble. One thing to say is that it's shutter sound is not nice, with a very sharp, "grumble" sound, but this is a question of the beholder - use DSLR-old players on this voice might feel not in the habit . As entry-level position in the models, A57 built-in auto-portrait composition, clear image zoom and wisdom shooting mode features three very suitable for beginners. rtc Auto A57 features a portrait composition is newly added, it can be saved as a picture through automatic face recognition for cropping photos composition, the human face is placed on the screen composition trichotomy golden point. rtc Perhaps for veterans, the trichotomy rtc composition is very easy to do things, and many newcomers to some extent, this feature can really enhance the beauty of your photos. This feature will save time before and after cutting rtc two photos, so when you open it anyway everyday use - as long as the memory card capacity is big enough.
Clear Image Zoom nutshell rtc optimized digital zoom function, has twice the maximum amplification effect, Sony claims that you can achieve comparable levels of optical zoom. After the actual rtc results we can say ... to make it through - and occasionally on the premise that quality care can look, but want to use it to replace the optical zoom is not possible - you can see some of the up after almost calculus enlarge mark law. So encounter situations focal length is not enough, if you care more about the quality, the more we recommend that you walk a few steps forward. Wisdom shooting mode can detect the scene and subject recognition, automatically adjust the parameters of the camera, including continuous shooting, HDR, Handheld Night Scene, and other functions. Is actually an enhanced version of the Auto position, so that users can more fool-style shooting. These three functions are new to this type of camera for pure novice, indeed can greatly reduce the difficulty of shooting, but from another perspective, taking pictures all the time if the exposure parameters, and even the composition completely handed machine body, the only thing to do is press the shutter, so the child seems to have a lot less fun of photography. For some enthusiast, the peak of the focus has been on the NEX series rtc of products are very popular feature in transfer some manual focus lens, it will highlight the edge portion of the focus areas on the screen. The A57 also appeared in the feature, taking into account the A57 is still A-mount design, flange distance (focal plane distance) is identical with the DSLR body, so the advantage is not as adapter NEX E-mount series as obvious But such practical function, in fact, occasionally used, so there is always better than none. A57 built Steady Shoot body anti-shake function, did not change much as before, the actual use would be able to reduce the security shutter speed 2-3. Need to be reminded that, if fixed on a tripod to shoot long exposure, it is best to turn off this feature, otherwise the point of anti-shake function will continue to operate but will result in some cases significantly paste off photos. The main characteristic feature semitransparent mirror image structure is capable of shooting in the movie is still a very high-speed autofocus, and ordinary DSLR difference is that the latter is due to filming reflectors lifted, so is the use of contrast AF to achieve while the former transflective reflector fixed part of the light through the mirror position is located in a semipermeable film is incident rtc on the sensor, the other part of the light is reflected by a semi-permeable structure to focus on the original phase, the solution to the SLR structure the high-speed phase focusing function is not contradictory with the filming of both. A57 is the above mentioned methods used, can be done manually control the exposure parameters of images, stereo Mic top of the fuselage also reduces wind noise. AVCHD and MP4 video formats supported are two, you can shoot at up to 1,920x1,080 resolution AVCHD, rtc 50Fps of 28M high-definition video encoding. Also appeared on the A55 over the overheating problem, this time on the A57 has been resolved. Because of this feature differences with other Sony SLT models is not much, there is not much ink a fee. Life, can be found on the A57 EVF viewfinder with more power than LCD viewfinder some, in general, and occasionally shoot a few images in the premise of maintaining the four hundred or more of battery life is not much problem. Quality performance
A57 is there to enhance the picture quality is a key factor in deciding whether it is worth buying, but also where we need to focus on in this review to explore the place. Transflective reflector structure just launched once had great controversy, many users worried about the impact on the loss of light through the semi-permeable membrane is one-third the amount of light would be quality. A77 until other high-end machine is still using a SLT technology, which from another angle shows the SONY confidence for this technology: no problem, rest assured it. And we used for some time in the future can also be sure that this technology is relatively mature, fully one-third of the impact that the loss of the amount of light through to the final image can be controlled within a range of nearly rtc invisible. But we must take into account the additional problem that the other brands in the current low-pass filter to remove rtc even take to improve the quality of the program, whether SLT can keep the same progress? ISO noise control capabilities following are the default settings and the highest quality output Jpg.
ISO 800 overall cleanliness is very good, very rich in detail preservation rtc under ISO 1600 quality perfectly acceptable rtc in the areas of solid color with a slight smudge, but not affecting the perception of ISO 3200 noise appears obvious, there began to be slightly lower saturation, in detail pretty good on reservations under ISO 6400 noise appeared in large numbers in the dark part of the white noise is also very clear, smear feel heavier, edge detail, there are some losses so for this camera, we recommended to the ISO control in 3200 following the shooting, If the thumbnail, then, ISO 6400 also have some availability. Overall rtc performance is quite good. But in bright rtc indoor rtc achieved ISO test results and not as a complete reference, we are more inclined to the actual light conditions down to test its imaging performance. A57 at high ISO capability of the details of the deal relative to the previous generation A55 have a certain upgrade, the biggest change is significantly reduced smear sense, on the edge of treatment, as far as possible to retain more information rtc in the premise of maintaining the purity of the screen. More dynamic range sample photos as an entry summary A57 grade product, it does not use a piece of high degree of concern with the level of the highest pixel CMOS, which can also be understood, A65 or who will buy it (laughs) . No update on the pixel, then the other aspects rtc are bound to be improved. 12Fps ultra high-speed continuous shooting? EVF resolution a little better? Does not seem too appealing, more changes on a specification. However, if you purchase the product just look at the specifications, we do not need to do the evaluation of. A57 biggest selling point, we think it should be relative rtc to the previous generation product quality aspects to enhance the overall A55, for example, it may not be a sensitivity to the same level of performance of the best, but also belong to the kind of good. Considering that it added some of the starters quite convenient features, such as automatic portrait composition, clear image zoom, Smart Capture, as well as bring EVF viewfinder rtc difficult to get started lower, allowing users to just kind of photographic equipment rtc also contact can be filled easily on a good photo shoot. Changes in body size, and for some women users, they may be more hope in the hands of a small number of cameras can, while men tend to be very receptive to the user larger fuselage. After six years since Sony acquired Konica Minolta entered interchangeable lens camera market, it has been playing a "spoiler" status, its products have always had a high price, the consumer's point of view, we are still very I hope to see this in. Currently, the official suggested retail price of A57 single-lens kit for HK $ 6,790 (about CN 5,515, NT $ 25,800), the actual purchase price will certainly be lower than this figure, the price is still good. If you already have a user is in the hands of the A55, we recommend to buy more higher-level A65 and A77, to get an upgrade larger; and for first-time users to buy, A57 would be a good choice.
Tags: Alpha A57, AlphaA57, APS HD CMOS, ApsHdCmos, dslr, dslrs, hk, hong kong, HongKong, review, Sony, Sony A57, Sony Alpha, Sony Alpha A57, sony ericsson, SonyA57, SonyAlpha, SonyAlphaA57, SonyEricsson, translucent mirror, TranslucentMirror
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