13 votes

Why aren't square CMOS sensors more popular by now?

Aesthetic considerations of the image aside, it's just mechanically obvious that a square fits inside of the image-circle produced by the camera's lens a lot better than a rectangle does. The short ...
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  • 140k
13 votes

Why are camera sensors green?

An unfiltered CCD or CMOS sensor looks very similar to any other silicon integrated circuit that has a very regular/repeating structure of similar structure size - semi-metallic gray (from silicon, ...
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12 votes

What limits the size of digital imaging sensors?

The largest CMOS sensors available commercially for photography are "medium format" and measure about 44mm x 33mm. CCDs exist in slightly larger sizes up to 54mm x 40mm. Larger sensors for scientific ...
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  • 117k
12 votes

How would a curved sensor change camera and lens design?

Digital image sensors used in modern cameras are essentially silicon chips: Sensor dies are produced in large batches on silicon wafers. The wafers are cut into many pieces with each piece housing a ...
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11 votes

Why does increasing sensor size necessarily lead to lower silicon wafer utilization?

Looking at those images/calculations it seems right to me. You might have enough silicon to make another sensor, but it's not in the right place. There's not another 24mm x 36mm spot anywhere on that ...
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  • 4,240
10 votes

How would a curved sensor change camera and lens design?

Curved film planes were very common in low-end roll film cameras and even 35 mm simple cameras. This is because they improve the image quality of a lens with a spherical focal surface, as is the case ...
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  • 5,814
9 votes
Accepted

Why does the Canon 450D have only 14bit depth RAW images?

The 14 bit depth is the limit of the physical sensors capabilities, it isn't just that the engineers decided to throw away useful data. An increasing number of bits available in a sensor reflects an ...
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  • 1,174
8 votes

Is it OK to clean a DSLR's CMOS (with filter removed) with compressed air spray?

TLDR; Do this at your own risk! The compressed gas is formed from a liquid propellant in the canister which under certain conditions can spray all over your very delicate electronics leading to short-...
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  • 9,430
7 votes

How would a curved sensor change camera and lens design?

It's not like there isn't any research being done in this direction: Origami silicon optoelectronics for hemispherical electronic eye systems ...reshaping conventional planar sensor systems into ...
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6 votes

Is it OK to clean a DSLR's CMOS (with filter removed) with compressed air spray?

If it's only compressed air (and not compressed refrigerant that is used in typical "canned air" products), then ideally it is no different from using a rocket blower, other than different air ...
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  • 31k
6 votes
Accepted

Why does increasing sensor size necessarily lead to lower silicon wafer utilization?

There is nothing that stops them putting smaller sensors on the wafer. It is rather doable. Some concerns are: Too close to the edge the mechanical processing introduces stress and dislocations so ...
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  • 6,107
5 votes

What limits the size of digital imaging sensors?

There are even bigger sensors. If you look closely to the image in the top-right corner of that page you'll see that the biggest sensor there is 'Medium Format Kodak KAF' sensor. Ok, I understand ...
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  • 4,395
5 votes
Accepted

What is the difference between APS-C and CMOS sensors?

Those are completely orthogonal concepts. APS-C is a sensor-size. Other sensors for DSLRs are Full-Frame or APS-H. CMOS is a type of sensor. Other sensors are CCD. One can have an APS-C CMOS sensor, ...
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  • 101k
5 votes

What is the difference between APS-C and CMOS sensors?

So this thread actually still comes up in search so i'm going to add a little addendum to it. I think the reason some folks get confused about this is because sometimes during compares it shows up in ...
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5 votes

Are these stripes bug or not?

No, it is not normal. These stripes look a lot like Newton's Rings, even though they aren't rings. Did you use some filter in front of the lens, which might have created those patterns?
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  • 6,770
5 votes
Accepted

Why are camera sensors green?

The color you see when you look at a "sensor" is usually determined by the combined colors of the colored filter arrays that are placed directly in front of the actual silicone chip as well ...
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  • 168k
5 votes

Why exactly do "CMOS astrophotographers" prefer CMOS sensors?

With a CMOS sensor, the analog-to-digital converters (ADCs) is on the same die as the imaging sensor. With a CCD, you get analog signal out of the chip, and an external analog-to-digital converter (...
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  • 6,032
4 votes

Is it OK to clean a DSLR's CMOS (with filter removed) with compressed air spray?

NEVER. All the other answers apparently missed that you've removed the IR/UV cut filter from on top of the sensor. All the standard cleaning methods assume this protective glass is in place. You are ...
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  • 49.1k
4 votes

Why does increasing sensor size necessarily lead to lower silicon wafer utilization?

Firstly, I think this is off topic. Secondly, I can't directly answer specifically for silicone, but I did work in circuit board manufacture. I assume the same the same points apply. When preparing ...
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4 votes

What limits the size of digital imaging sensors?

Some more things that can limit what's practical to below what can be manufactured: weight (of the resulting system). A very large sensor needs a very large image circle, which means large lenses, ...
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  • 4,889
4 votes
Accepted

Native ISO vs Boost ISO. What kind of amplification corresponds to each of them?

You're getting a little confused. Un-boosted ISO Or what you're calling "native range." There's a native ISO setting, which is what the sensor uses without any amplification, and you can consider ...
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  • 49.1k
4 votes
Accepted

What are the bottlenecks in a regular CMOS sensor chip?

What is preventing me from sampling it at a higher rate? Every discrete step in the operation takes time. Changing the value of inputs to a logic gate takes time. Once those inputs have stabilized, ...
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  • 31.2k
4 votes
Accepted

Active array, Optical Black region and non-microlensed region in CMOS sensor

Those are known as manufacturing buffer pixels or, sometimes, dummy pixels. They often exist to act as a sponge for any electrical interference that would otherwise effect the imaging pixels. ...
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4 votes

Is the color reproduction of different cameras inherent to the sensor or due to software?

It can be about either the sensor's sensitivity to specific portions of the visible spectrum or about the algorithms used to create color from the monochromatic luminance information collected by the ...
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  • 168k
3 votes

Why does increasing sensor size necessarily lead to lower silicon wafer utilization?

For high value chips, like imaging sensors or i7 CPUs, it generally isn't worth it - silicon real estate isn't the major part of the costs. You would need the other chips to be smaller, but have a ...
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3 votes

What's the difference between CCD and CMOS image sensors?

The working principle is the same in both systems. Light makes electrons in silicon 'jiggle about' and the silicon is etched in a way that the jiggling makes those electrons move in the same ...
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  • 9,430
3 votes
Accepted

How is the spectral response of a camera typically measured?

Here are some of the ways: http://www.image-engineering.de/iq-products/iq-tools/measurement-devices/camspec http://www.image-engineering.de/iq-products/iq-tools/measurement-devices/camspecs-express I ...
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  • 2,001
3 votes

What is CMOS in SLR camera?

I'm sure somebody more knowledgeable than me will give an extensive answer, but the short answer is: It refers to the technology of the image sensor, see active pixel sensor on Wikipedia. Roughly ...
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3 votes
Accepted

CCD sensors use a digital shutter. Why don't the more expensive CMOS sensors?

There are CMOS-based cameras with electronic shutters (basically all cameras with video mode have electronic shutters) but the technology does have its limits. When the camera reads from a CMOS ...
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