Archive for: cmos

Canon Mirrorless Information [CR1]

Canon Mirrorless Information [CR1]

A bit of information
With Canon’s expected foray into the mirrorless segment just around the corner, a bit more information has started to flow.

We’re told the new camera is in fact a new mount, I think most expected this. The camera will launch with at least 2 lenses and an EF adaptor. One lens will be a wide angle “kit” lens as well as a telephoto lens.

No word on whether or not the EF adaptor would also adapt EF-S lenses, though I would hope it did.

It is also suggested that the new primes that Canon has announced and released (24, 28, & 40mm) are the first in a series of small prime lenses meant to work well with EOS EF and the mirrorless camera.

Information about the body itself is pretty vague. It’s still suggested the camera will use the 14mp CMOS G1 X sensor. A “good” ISO range and “average” video performance. A video focused camera could be “in the future”.

EF Lens Adaptor
We have posted a couple of patents in the past about such an adaptor. You can view them here and here.

Northlight has posted a cool little diagram showing the size of the EF adaptor in comparison to the new EF 40 f/2.8 pancake.


Canon Develops World’s Largest CMOS Sensor

The new sensor beside a 35mm Full Frame Sensor

Canon succeeds in developing world’s largest CMOS image sensor, with ultra-high sensitivity

TOKYO, August 31, 2010-Canon Inc. announced today that it has successfully developed the world’s largest*1 CMOS image sensor, with a chip size measuring 202 x 205 mm. Because its expanded size enables greater light-gathering capability, the sensor is capable of capturing images in one one-hundredth the amount of light required by a professional-model digital SLR camera.

At 202 x 205 mm, the newly developed CMOS sensor is among the largest chips that can be produced from a 12-inch (300 mm) wafer, and is approximately 40 times the size of Canon’s largest commercial CMOS sensor.*2

In the past, enlarging the size of the sensor resulted in an increase in the amount of time required between the receiving and transmission of data signals, which posed a challenge to achieving high-speed readout. Canon, however, solved this problem through an innovative circuit design, making possible the realization of a massive video-compatible CMOS sensor. Additionally, by ensuring the cleanest of cleanroom environments during the production process, the sensor minimizes image imperfections and dust.

Because the increased size of the new CMOS sensor allows more light to be gathered, it enables shooting in low-light environments. The sensor makes possible the image capture in one one-hundredth the amount of light required by a 35 mm full-frame CMOS sensor, facilitating the shooting of 60 frame-per-second video with a mere 0.3 lux of illumination.

Potential applications for the new high-sensitivity CMOS sensor include the video recording of stars in the night sky and nocturnal animal behavior.

Through the further development of distinctive CMOS image sensors, Canon will break new ground in the world of new image expression, in the area of still images as well as video.


The CMOS Sensor Squared [CR2]

Get Squared
This is a leak from an unnamed camera manufacturer about square sensors.

We have heard in the past that the 1Ds Mark IV would have a square CMOS sensor. Most people dismissed it as poppycock.

This rumor may appear to be in a different format that previous rumors, however this is how it was sent to me and I was told to post it as such.

by Dean Francis

Camera image sensors commonly use rectangular formats (3:2, 5:4, 16:9 aspect ratios). However, to obtain the highest image quality, the square format (1:1 aspect ratio) should be used. The advantages are surprisingly extensive as outlined below:

The square format covers 100% of the maximum field of view. The maximum FOV is the largest area that can be covered by any four sided sensor (see diagram). A rectangular format (3:2) uses only 89% of the maximum FOV. Simply stated, the wider the rectangle, the smaller the photograph. The square format is about 11% larger – a considerable amount of image data.

Generally speaking, image quality suffers along the outer third edge of lenses. That’s where any circle of confusion (COC) issues become readily apparent, such as blurring, chromatic aberration, distortion, vignetting, etc. A rectangular format actually pushes outward into that area of the lens. 18% of the image (4 corners & 2 sides) are clearly degraded. However, the square format eliminates degradation (all 4 sides) and minimizes the remainder by pushing it farther into the corners.

Photo sites benefit dramatically when their size is increased. The square format has a surface area 12% larger than a rectangular format (3:2). Photo sites can be manufactured 12% larger, a gain of +1.12 per micron. The 12% increase also expands sensel (super pixel) variations of resolution and enables 16 bit RAW capture when coupled with improved binning algorithms.

Cropping a landscape oriented photograph (3:2) down to portrait discards about 60% of the image data (see diagram). With a square format, only 20% is lost. Landscape vs. portrait orientation can be determined later based upon output. Once cropped, only 3% of the peripheral loss region remains (extreme corners).

Photographers no longer have to rotate the camera and the secondary portrait grip becomes a thing of the past. Also, the quantity of materials is lessened (about 10%) by shortening the toe, foot and heal of the bottom plate. Weight is thereby decreased, allowing for significant changes and reallocation of the source/component materials. Additional battery capacity can be maintained and/or relocated to a secondary or supplemental location. The sensor is also cooled more evenly (about 5%) by equidistant dissipation of heat through the mount.

The list of improvements for the square format is extensive, benefitting camera functionality in all photographic and video applications. It’s also highly cost effective from a materials/manufacturing standpoint, desirable from the consumer’s viewpoint and fully marketable as a standardized format.   Dean E. Francis