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Friday, 6 February 2015

Canon reignited the megapixel war today by officially announcing the 5DS and 5DS R, the highest resolution full frame DSLRs in the world. The cameras continue the 5D line with an impressive jump in megapixels, going from 22.3MP to a whopping 50.6MP.
Physically the cameras appear to be identical to their predecessor. The LCD on the back is still a fixed, non-tilting 3.2-inch display with 1.04 million dots.

ISO has actually taken a step backwards. While the 5D Mark III offered a range of 100-25600, the new cameras are limited to 100-6400. Canon doesn’t explain this in its announcement today, but we previously heard that it was because the cameras have a superior color filter array for the best color accuracy Canon has ever offered.

With such high resolution, both cameras have been engineered with designs and features that attempt to minimize camera shake. In addition to physical design choices (e.g. reinforced guts to increase rigidity), the cameras have redesigned mirror vibration control systems and a new feature called Arbitrary Release Time Lag in Mirror Lock mode. This makes the camera snap a photo only after a certain amount of time has passed after shutter release, which allows camera shake to go away first prior to the exposure.

If you don’t always want 50.6MP files popping out of your camera, there are new crop modes and aspect ratios to choose from. You can drop down to 30.5MP for a 1.3x crop mode and 19.6 for a 1.6x mode. There are also choices between 1:1 (i.e. square format), 3:2, 4:3, and 16:9 for your photos’ aspect ratios. A mask or outline on your LCD screen will show you exactly what framing the resulting photo will have.

Both cameras pack dual DIGIC 6 processors, a 150K pixel RGB+IR metering sensor with 252 zones, dual SD/CF card slots, an intervalometer, a bulb timer, a 100% field of view viewfinder, time-lapse movie creation, a 61-point AF system with 41 cross type, 5fps continuous shooting at full res, and shutters rated for 150,000 cycles.

On the video side of things, the 5DS cameras capture 1080p recording up to 30fps or 720p up to 60fps, but they lack microphone inputs and HDMI out capabilities. We previously heard that yet another 5D, the 5D Mark IV, will be more video-centric when it’s launched later this year.

The difference between the 5DS R and the 5DS is that the “R” edition omits the low pass filter that’s used for dealing with the moire effect in order to achieve slightly better detail resolution. Otherwise, these two cameras are identical.

Update: If you’d like to see what a 50.3MP photo looks like, here’s a full-resolution sample photo shared by Canon:

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Wednesday, 4 February 2015

YOUTUBE Channel, "The Slow Mo Guys", they take you through a speed camera in slow motion into the world, such as the rubber band tied at the moment and then explode a watermelon circle, or see the bullet shot out of the water when screen, but this time the Slow Mo Guys job situation is shooting DSLR mirror room, the process of using slow shutter operations film presents!

Principle of operation of the shutter I believe many people have seen the information and explanations, but then how did not actually witness it impressed! The Slow Mo Guys shoot with the Phantom Flex high speed camera Canon EOS 7D mirror room to ultra-high video frame rate 10,000fps presented 400 times in slow motion video, you can clearly see that after pressing the shutter inside the DSLR is how it works : mirror lockup, before and after the shutter curtain from the top down to complete the exposure, and then put down the mirror. The slow motion through the presentation of shock when the mirror is raised and put down is also more pronounced. Another film also demonstrates the differences set the shutter speed from 1/8000 seconds to 1/1000 second to control the amount of light of different before and after the shutter open inexpensive, poor closing time is not the same.
▲ Slow shutter operation of the rendering process.

▲ different shutter speeds through space the size of two pieces of curtain control the amount of light. (Source: film screenshot)

In addition, The Slow Mo Guys also mentioned the rolling shutter (rolling shutter) of the impact and effectiveness, due to CMOS at the completion of the exposure, the electronic signal is like a top-down / left to right (or vice versa) as the shutter operation Lim progressive scan, so there will be the main effect of deformation or jelly. Usually under extreme conditions, such as when the fast pan mirror, violent shaking of the screen, or the main rapid lateral movement from the front of the lens. The film also has examples (from 5:40 start watching), the scenery shot in the car, along with the picture can be seen whizzing fence poles and are skewed. Because of rolling shutter on the record there is a time difference of the photosensitive element, so sometimes feel weird to see some fantastic pictures, such as another example cited in the film (from 4:45 seconds to start watching), to spray champagne yet in the air, but the shadow has to face the people.

Relative to the rolling shutter, CCD sensor used in the past is global shutter (global shutter), the photosensitive element, "while" the exposure of the entire screen, there is no such problem. It is understood that there are now a global shutter CMOS, but they are used for professional-grade equipment, can look forward to the next round after the maturity of the technology used in consumer products. If you're still not clear rolling shutter and global shutter works, you can refer to this article abroad, detailed illustrations inside, you probably know how the poles are crooked.

▲ rolling shutter because of the time difference, champagne was sprayed into the face of the first half of the shadow already. (Source: film screenshot)

▲ rolling shutter another common example, the body from the front of the camera quick lateral movement and produce skewed. (Source: film screenshot)

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