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發表於 2010-8-26 01:30:46
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這次 SONY 出了 4款新 DSLR
16MP - A55 ; A580
14MP - A33 ; A560
A55 , A33
| Sizes | • AVCHD
 1920 x 1080, 1080i (60/50fps), Av. 17Mbps
• MP4:
 1440 x 1080, 1080p (30/25fps), Av. 12Mbps
640 x 480 (30/25fps) | | Audio | • Dolby Digital Audio
• Stereo audio capture via optional external mic. | | Format | AVCHD / MPEG4 | | File size | 2.43 MB/sec (1080i
AVCHD), 1.65 MB/sec (1440 x 1080 MPEG4)) | | Max file size per clip | 2.0 GB for Motion JPEG, card capacity for AVCHD (new file is created automatically after file size has reached 2 2.0 GB) | | Recordable time | Approx 29 minutes (around 9 min with SteadyShot enabled) |
DPreview 評測
http://www.dpreview.com/reviews/sonyslta55/page14.asp
Video quality comments
The Sony SLT A55's sensor is APS-C size and therefore you can't quite create the same depth of field effects as on a full-frame-camera such as the Canon EOS 5D Mark II but you still get a much shallower, more cinematic depth of field (and much better image quality) than most camcorders or any digital compact camera. The videos are screen-filling and the level of detail and smoothness are pretty much in line with other cameras of this level. In low light the footage becomes grainy but again, this is not worse than on any of the competitors. There is also no discernible quality difference between the MPEG-4 and AVCHD formats.
索尼SLT A55的傳感器是APS - C規格，因此，你不能完全創作相同的景深效果作為一個全畫幅相機，如佳能EOS 5D markII，但你仍然可以獲得一個更淺，更電影景深（和更好的圖像質量）比大多數攝像機或數碼相機。 該影片是screen-filling 和影像細節和平滑性方面幾乎一致與其他相機的這個水平。 在低光的畫面變成粒狀，但同樣，這是不遜於任何的競爭對手。 也沒有明顯的質量差異的MPEG - 4和AVCHD格式。
Continuous is the default AF mode when shooting video (single is not available). It is generally pretty good but there are some occasional focus shifts and the AF can, despite the A55's translucent mirror, struggle to follow fast-moving subjects. As sometimes the focus motor can also be heard in the audio recording we would recommend switching the AF off and focus manually as an alternative.
連續自動對焦模式是默認的視頻拍攝時（Single 不可用）。 一些偶然的焦點focus轉移和自動對焦表現可以，即使 A55使用半透明反光鏡，快速移動的物體仍然不容易對焦。 有時對焦馬達也會被收音進去，我們的錄音將建議關閉切換自動對焦和手動對焦作為替代。
Talking of audio, the A55 has built in stereo microphones but with the option to add better external stereo mics. We did not have a chance to test the latter but experience tells us that an external microphone a very useful accessory if you plan on recording 'serious' video with sound. The built-in mic is pretty sensitive and though the sound quality is perfectly acceptable it's not directional enough, and tends to pick up camera operation noises.
說到音頻，A55已經內置立體聲麥克風但可以選擇添加更好的外部立體聲麥克風。 我們沒有一個測試的機會，但經驗告訴我們，一個外接麥克風一個非常有用的配件是必要的如果您計劃錄製'重要'的視頻與聲音。 內置的麥克風是相當敏感，雖然聲音質量是完全可以接受它的不定向不夠，往往會錄進去拿起相機操作的聲音。
Like pretty much all other video-capable large-sensor cameras the SLT-A55 suffers from distortion caused by its rolling shutter. The readout of the sensor means horizontal lines of the image are scanned, one after another, rather than the whole scene being grabbed in one go. The upshot is that verticals can be skewed if the camera (or the subject) moves too fast - the top of the image has been recorded earlier than the bottom, so vertical lines can be rendered as diagonals. The effect is clearly noticeable on the A55 but you have to pan quickly to make it too intrusive. The camera is fairly average in this respect but we have seen a few models which handle the problem a little better.
就像幾乎所有其他可錄影大尺寸sensor相機;- A55 仍有rolling shutter造成失真distortion現象。 該傳感器的讀出方式水平線的圖像進行掃描，一個接一個，而不是整個場景scene一下子被抓住。 其結果是可以垂直影像會有偏斜，如果攝像頭（或主題）動作太快 - 頂部的影象會早於底部記錄，所以垂直線可呈現為對角線。 這效應A55相當明顯，在你迅速pan會使intrusive更清楚。 該相機在這方面表現相當平均，我們已經看到幾個型號的處理問題的一個好一點
Overall the A55's video mode delivers good quality output that is far better than anything you'd get from a digital compact camera. The optional external microphone is a good option for more serious videographers but the lack of control and shutter speed during video recording make it less of a creative tool than some competitors. Below you'll find some examples of videos taken with the camera for you to download and draw your own conclusions.
總體來說，A55的視頻輸出模式提供良好的質量是遠遠優於任何你可得到DSC數碼相機。 可選的外部麥克風是一個不錯的選擇更重要的錄影，但缺乏控制和快門速度在錄像方面來說比一些競爭對手缺乏創造性工具空間。下面你可以找到一些例子，影片採取的相機為您下載並得出自己的結論。
翻譯修正 Daren
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發表於 2010-8-25 15:49:12
發表於 2010-8-25 17:16:21
lcd可翻.對拍蝶是非常好的.
