What will be coming from Canon and when ?

Started 4 months ago | Discussions thread
Mikael Risedal
Senior MemberPosts: 2,357
Like?
Re: What will be coming from Canon and when ?
In reply to Wayne Larmon, 4 months ago

Wayne Larmon wrote:

Colin Smith1 wrote:

Mikael Risedal wrote:

What will be coming from Canon?
The sensor from Canon is almost good as from Sony/Toshiba etc. Canon are little bit behind in QE with 50% compare to the best Toshiba 65% Sony 56%.
The DR problem starts when Canon reads out the signal from the sensor , Canon have long analog signal path way. And this shows at base iso with high read out noise, pattern noise banding and therefore 11-11,7 stops DR compared to others like Sony with 14 stops and even little more.
More Mp-when?


To use the latest APS line and make a 24x36mm sensor with the same structure as the 18Mp sensor in 7d will be expensive and time consuming because APS line will be occupied, Canon has no steppers, lenses to expose a 24x36mm area in one time with smaller geometry/scale as its needs for a new sensor tech as Sony, Toshiba, Panasonic with for example column wise ADC on-board the chip. Canon can stitch the sensors but also that is time consuming and costly
Canon has neither the whole assembly in house, the turn themeselves to Fujitsu
Compared to Sony who has 5-7 lines and down to 90nm (and even smaller) Canon has two older lines.
It is no coincidence that Canon tell us that it is enough with 20-22Mp when Canon has no equipment to go down in the scale/ geometry which is required if they are going to compete with new tech and higher resolution in larger sensors

Huh???

Canon uses old, obsolete technologies for their sensors. Read this comment by Fazal Majid

Until a couple of years ago, roughly up to the 5DmkII, Canon sensors were better (the D3 had better low-light performance, at the cost of far fewer pixels). They rested on their laurels and opted not to update their fab and are still building their sensors on 0.5 micron technology, when Sony is using 0.18µ technology. This means the transistors used to read photon data take more surface area, space that cannot be used for actually capturing pixels and thus improving SNR.

For more details, see:
http://www.chipworks.com/blog/technologyblog/2012/10/24/full-frame-dslr-cameras-canon-stays-the-course/

This comment was in response to a blog post by Philip Greenspun (creator of Photo.net) that discussed this issue (Philip owns Canon equipment and wasn't too thrilled when he learned how poorly Canon sensors rate on DxOMark.) Here is Philip's blog post:

http://blogs.law.harvard.edu/philg/2013/01/18/independent-analysis-of-dxomark-sensor-tests/

Back to the Chipworks teardown. Canon is an using old .5 µm process, while Sony and Toshiba have advanced to .25 µm and .18 µm processes. This is what Fazal is talking about. And what Mikael is referring to.

Wayne

Not fewer pixels if you compare 1dmk3 and the signal noise was better than both 1dmk3 and 1dmk4

--
Member of Swedish Photographers Association since 1984
Canon, Hasselblad, Leica,Nikon, Linhoff, Sinar
President of IARNA International anti-banding and read out noise Association

Reply   Reply with quote   Complain
Post (hide subjects)Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow