底下是Canonrumors.com网站中提到的5D后继机可能规格:
* 21.1MP FF
* DIGIC IV
* ISO 100-6400 L:50 & H:12800
* 5 FPS
* 3.2" High Resolution Screen (LCD)
* 19 point AF
* HDMI Out
* Liveview
* HD Movie Mode
* Viewfinder: 100% Coverage
* Full weather sealing
* EF Lenses only
●Reducing the micro lens gap to capture all the light hitting the sensor. This has been highlighted in the 40D, 1D III and 1Ds III sensors and the new 50D sensor now achieves effective 100% coverage. Only very minor improvements are expected from this point on (e.g. shaping the lenses towards the corners of the frame to capture angled light.
●Reducing the noise level of each pixel. Canon have made changes over several generations of sensors to achieve this, bringing the amplifiers closer to each pixel, changing micro-circuit configuration and lowering voltages so the sensor runs colder. Again the design of the 50D is a big step forward here from the 40D and 1D III etc. Canon have one more big jump lined up, with low voltage cold running CMOS designs to gain at least an additional stop in lower noise at higher ISOs or long exposures.
●Better digital noise reduction. These are the changes in DIGIC noise processing. First with the Chroma Noise reduction in DIGIC III and now with more advanced multi-level noise reduction options in DIGIC IV. Canon believe they have made most of the gains possible via processing algorithms but do still have some areas to develop. The next focus will be faster noise reduction processing so that it does not come at an impact on frame burst rates (look to the 1D3 replacement for example)
●Pixel binning for high ISOs. A new technology enabled by the complexity and processing power of DIGIC IV where they can bin 2, 4 or 8 pixels together at the raw level and average out the noise between them. This is seen by Canon as a key technology in balancing very high resolution sensors (in the 50mp range) with low noise at very high ISOs. Right now they are not pushing this too much with the 50D so as to not create confusion in the market (they see more potential for the technology as sensors get larger and in the pro-market).
●Increased image resolution – This is a newer strategy (most evident on the 450D where they have changed the anti-aliasing filter (thinner and closer etc) so as to achieve a crisper image per pixel without loosing the benefits of anti-aliasing filter on diagonal edges etc.. The 50D has the same technology. One further option for the future is for Canon to drop the anti aliasing physical filter and do it in a future DIGIC generation where there can be smarter allocation of colour values than the blurring achieved by a light based filter.
●Increased raw bit depth for improved dynamic range. Here Canon have made the jump to 14 bit and will move to 16 bit in their future sensor technology generations. Canon see the main usage of extra bit depth as providing the dynamic range to translate the sensor image into a printable or viewable image with a higher dynamic range. In other words mapping the 14 or 16 bits into an 8 bit viewable or printable image that mimics the dynamic range in the scene.
●Dynamic range preservation options – Canon are putting a lot of focus into how to provide the photographer with the best options for preserving the dynamic range of the original image in both a RAW file and the 8 bit JPEG. The highlight tone preservation option on the 40D, 1D III etc was the first step. The new 'automatic brightness' options in the 50D are another, where they try and optimise the brightness of various parts of the image to reduce the dullness from shadows. Canon are planning much more in this area, down to the equivalent of varying the ISO level across the different parts of the sensor when the image is taken (easier in live view mode of course).
尤其是第三点"Pixel binning for high ISOs,这可能也是5D后继机有能力把像素规格开到很高(比如谣言指出的21.1MP)的原因,或许可能让最大像素拍摄时,高ISO略输D3/D700,但缩到约12MP拍摄时,噪声跟D3/D700一样,解像力却更高
当像素越高时,是否可把这些像素拿来做其它应用?把数个"(ex: 2、4、8个pixels)pixel数据合并当成一个pixel数据,藉此分散噪声到每个pixel里,因次当需要使用高ISO时,可能是降低拍摄像素来达到,让高像素感光组件同时能保有可用高ISO的能力
Canon的5D Mark II準備要出的謠言,也是傳了不短的時間。不過,最近卻突然爆出一個新的機能,那就是這幾天Nikon D90討論非常激烈的錄影能力(其實D90也有其他地方更新,但討論熱度完全無法與錄影相比)。在D90這種等級的數位單眼放「錄影功能」是否恰當的討論還沒有停歇的情形下,沒想到更高階的5D Mark II也爆出能夠錄HD等級影片的謠言。
Canon的5D Mark II傳言甚囂塵上,再加上5D也撐得太久了,想來出的機會是很高的,但有沒有HD錄影能力,目前倒是無法證實。不過筆者倒是很希望5D Mark II 能夠加進去,因為不管錄影效果好不好,其他廠商也不得不跟進。這樣數位單眼繼LiveView之後,錄影功能也會開打。如果這款單眼有的話,想來日後數位單眼錄影能力的普及,也是指日可待了。