Questions tagged [sensor]

A sensor is the digital camera's equivalent to film. It contains millions of tiny light-detecting areas called photosites, which convert light into an electric charge. After exposing the sensor to light, this charge is read from each pixel and converted into a digital image.

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1answer
135 views

Sensor spot/dust testing - should test shots be exposed to the right?

I recently bought a new camera and have been doing some sensor spot/dust testing. In some sites/guides/videos, aside from the usual setup (ISO 100, F/22, focus to infinity, shoot at a blank white wall,...
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3answers
52 views

Electronic shutter - what controls it?

From what I've read thus far, electronic shutter is a type of device that controls whether the image sensor is turned off or on non-mechanically. What exactly controls it and how does it turns the ...
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1answer
94 views

Is my sensor dying?

Please check this 100% crop of a night sky. I shot this on a Nikon D750 with a Nikkor 50mm f/1.4 D @ f/8, ISO 100, RAW format. I had already noticed that kind of noise / hot pixels (all these small ...
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2answers
149 views

pixel binning vs higher individual pixel size

Some smartphone cameras support pixel binning, to switch between high-res and low-light modes. An example would be the S20 ultra, which has an 108MP sensor that can bin pixels on a 3x3 grid, leading ...
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2answers
61 views

What covers a sensor, and what can we clean it with? [duplicate]

What can we clean camera sensors with? Generally googling returns 'ethanol'. Various people use ethanol for the job. What else can we use? Isopropyl alcohol, perhaps, eye glasses cleaner? The ...
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1answer
87 views

What causes this kind of sensor spots, and how do I clean it? [duplicate]

I get this spot in my images, on Sony A7III shot data: 0,8" second, F/36, ISO3200. Focused at closest point. Full Frame: Frame crop: As seen here, the spot is caused by dirt on the sensor: I ...
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3answers
190 views

Bayer color effective true resolution [duplicate]

Because in a typical digital camera, each pixel records only one color though use of a Bayer filter or similar mechanism to achieve color vision, the true resolution of a ## megapixel sensor is ...
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4answers
822 views

photon counting with a DSLR

I'm quite new to photography, but was wondering what settings I should have in order to have a good approximation of the relative number of photons that creates each pixel? i.e. best settings such ...
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1answer
76 views

How to calculate a sensor size when all I know is focal length and resolution? [duplicate]

A lot of the related questions require variables that we simply do not have. I would like to calculate sensor size for a video camera. We have focal length and resolution but I do not know the field ...
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3answers
387 views

Is it better to shoot at diffraction limited aperture or sharpest lens aperture?

In the old cameras like Nikon D80 with 10 Megapixel pixel count. The diffraction limited aperture is F/13 but its known that lenses are generally sharpest at the F/8 so it's a no brainer to shoot at F/...
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3answers
236 views

Reason for offset in lens/sensor and tripod mount?

I have noticed that my Canon Powershot G11 tripod mount is more in the center of the body of the camera and not aligned with the lens/sensor. Is there a reason for this? My concern is that as I rotate ...
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1answer
69 views

Why was JFET-LBCAST such a short lived sensor technology?

I have been reading Wikipedia for a while and I realized Nikon developed this technology for a long time for their top of the line DSLR's and then abandoned it in the favor of the CMOS sensors. But ...
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2answers
102 views

Is Sensor Noise Consistent Between Cameras of the Same Model?

The RAW photo editing program Darktable has a "Denoise - profiled" filter which reduces image noise by using a noise profiles for your camera model and ISO submitted by other users: The darktable ...
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2answers
141 views

Is diffraction limited aperture independent of lens?

I have always understood diffraction limited aperture as a property of the camera and its sensor, not of the lens. The camera has a certain sensor size and a certain megapixel count, which together ...
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1answer
39 views

Why do I get pinkish tint on some photos in DJI Mavic 2 Pro hyperlapse?

I tried to take a twilight hyperlapse with Mavic 2 Pro. However, there is a pinkish tint unevenly distributed randomly in the shots: Needless to say, all images have the same settings (as part of ...
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3answers
86 views

How do I use a container of sensor cleaning fluid?

I purchased Visible Dust sensor cleaning kit, but don't know how to use ampoule in which cleaning fluid is contained. Instead of screw cap there is snap-on cap with stick protruding into fluid, in ...
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2answers
151 views

Is 24MP actually matched to Full-HD Resolution when factoring in the differences on how pixels are defined?

Naive assumption: 24MP sensor vs a Full HD monitor of 2MP, sensor has much more resolution. Second look: You sample something that is not synchronous to your sampling raster/clock, you need to ...
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1answer
50 views

Lumix G85 - Black Corner regardless of lens and no hood - please help

I have owned a Panasonic Lumix G85 for about a year. This month, I've started getting a black area on the left corner of my images, which you can also see on the EVF. I can't see anything on the ...
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1answer
70 views

Ghosting artefacts in narrow DOF photographs

Snapping with a Canon EOS 600D in narrow DOF situations (for example with low f-stop numbers at long focal lenght), I get ghosting artefacts on the parts of the photograph which are out of focus. ...
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1answer
174 views

Why is my dSLR giving me an incomplete image?

I'm shooting with a gently used Nikon D70s (with roughly 15k clicks) and a newer Nikon AF-S Nikkor 55-200mm ED VR lens. The lens works fine on other cameras. The memory card works fine on other ...
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0answers
36 views

Are any common (optical) filters useful to attenuate overwhelming blue spotlights in live music situations?

Strong blue spotlights as typically used on outdoor stages are often so physically bright (which I guess they have to be, given how viewers perceive blue as very dark) that they provoke channel ...
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122 views

Small spots on EOS m50 sensor [duplicate]

I had open my lens of Canon EOS m50 while I am on a ferry to a local island near by. Once I reach home I saw few spots on sensor which doesn't look like dust. I used swabs and cleaned the sensor it ...
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229 views

What causes this repetition pattern in a picture? (when re-arranging its pixels by their intensity - code included) [closed]

Just out of curiosity, I was playing with RGB coordinates and pixels of pictures. Then for some reason I decided to get all pixels of a picture, get the RGB coordinates/values of each pixel (eg. RGB(...
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4answers
224 views

Why does the green gain affect the blue and red values on a CMOS sensor with individual gain control?

I'm taking pictures of little surfaces (5 x 5 Millimeters) in an experimental setup with an ids camera that contains a cmos sensor. Afterwards the pictures are split into the 3 color channels (red, ...
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1answer
66 views

What would be the most technically unaltered/numerically close camera-to-monitor workflow using common software? [duplicate]

If the intention was to, as much as possible, shove the ADC output octets that were present in the camera right up the framebuffer and out the HDMI cable - possibly truncating LSBs, if possible ...
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3answers
563 views

Is there any camera with a square sensor?

For creators who wants to make videos for platforms like IGTV and youtube as examples you have two totally different formats. Portrait and landscape. You could obviously crop a video or photo from ...
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4answers
403 views

Since larger pixels increase depth of field and sensitivity, why don't we have large sensors with a low number of pixels?

If I understood correctly, the DoF (all other parameters fixed) increases with the pixel surface. So to have a high sensitivity together with a deep DoF, why don't we just have big pixels (and thus ...
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6answers
2k views

Does a sensor count the number of photons that hits it?

I'm interested in the grayscale image case. In a sensor there is an array of cavities which collect photons. (Source: Cambridge in Colour Digital Camera Sensors) Does each cavity count the number of ...
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2answers
111 views

Do different microlenses on EOS R / RP affect use with EF lenses?

I have read that EOS RP uses otherwise the same sensor as the 6D Mark II. However, RF mount has a lower flange focal distance than EF mount. Therefore, Canon has adjusted the microlenses in EOS RP to ...
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1answer
91 views

Calculation for getting dimension of object in image [duplicate]

I am trying to calculate the dimensions of an object in an image. This is a sample image I took to get height of the brown box. I have this white box which measures 16cm and I would like to know the ...
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2answers
71 views

Is there any long-term negative effects of frequent automatic in-camera sensor cleaning?

Many newer digital cameras offer an automatic sensor cleaning option in the menu that uses some sort of sensor vibration to shake off dirt. This strikes me as a source of potential long-term ...
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1answer
126 views

What does the solution used in DSLR sensor cleaning kits contain?

What is the actual solution used in DSLR sensor cleaning kits?
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4answers
3k views

Can smartphones with the same camera sensor have different image quality?

Xiaomi Mi 9 and Redmi Note 7 Pro have the same camera sensor — Sony IMX586 Exmor RS. Does this mean both smartphone have same image quality output when pictures are taken?
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1answer
86 views

Is there any real need for substitute filters for a manual-focus, live view full spectrum conversion?

Assumption: If I have some cheap/used/partially-broken-but-picture-taking DSLM, and want to use it as an experimental full spectrum camera, the only downsides to cleanly removing the filter stack and ...
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4answers
600 views

Do cameras actively filter out UV light, or only infrared?

I know that a camera has a filter in front of the sensor to limit incoming light to the visible spectrum, to replicate what a human eye can see. But wherever I look on the internet, I always read ...
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1answer
167 views

Does near infrared AF assist light work with sensor based autofocus?

Some flashes, cameras and wireless flash triggers (like Canon ST-E2) have a near infrared AF assist light that is invisible to the human eye. My understanding is that his AF assist light works at ...
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3answers
161 views

Why do DSLM designs almost never shift the sensor plane all the way back to save on thickness?

A common problem with mirrorless designs is that long, especially adapted or output-telecentric designs, still stick out far more than they would eg on a small film SLR or rangefinder. One obvious ...
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4answers
417 views

Pixels and photodiodes

A photodiode is the smallest element of a digital sensor, while a pixel is the smallest piece of information in a digital image. I wonder if the two terms can be used interchangeably or there are some ...
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3answers
640 views

Does red noise even at low ISO values mean a hardware problem with my camera's sensor?

I have an Canon 200D (Rebel SL). I am concerned about the red noise in the darker parts of the picture, at low ISO values. Especially in the blue sky. Could this be a hardware problem with a sensor? ...
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1answer
137 views

Why does purple lines appear in CCD?

I know CCD scans the array line by line and over voltage from even a single pixel can wreck the whole line. But why are these wrecked lines colored magenta?
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4answers
3k views

Why are camera sensors green?

When I look at a CMOS sensor it's green. But CCD sensor. photos in the internet show pink sensors. So what exactly defines the color of an camera sensor? Especially what defines colors of the ...
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1answer
349 views

Have I damaged my camera's sensor? [duplicate]

Excuse the image of the random cat, but I noticed these random purple spots/lines in all the pictures I've taken today. They're in the same location and in the same shape so have I damaged the sensor?
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2answers
199 views

dB ratings for sensor SNR, what do they specify exactly?

I find the use of dB values to specify sensor properties confusing.. A rating of 20dB SNR at a given ISO setting could mean, assuming a reasonably linear system: RMS noise voltage and thus luminance ...
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2answers
113 views

Will these particles on the sensor affect image quality?

I have a Canon Rebel T6. I'm really newbie and know very little about photography. I think I made and big mistake and accidentally let dust enter the sensor area and the mirror area. To visualize the ...
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1answer
94 views

What could be the reason for suddenly changing brightness in raw image?

A series of night shots show this abrupt change of brightness: It starts at approximately 60% horizontal and extends to the right corner. I didn't notice this effect before, the temperature was ...
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2answers
412 views

LIDAR burnout; ways to check for damaging infrared lasers before shooting besides looking for posted warnings?

The BBC News article Driverless car laser ruined camera describes a situation where a particularly powerful infrared laser from the LIDAR of a prototype car at the CES show damaged the sensor of a ...
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1answer
337 views

Are colours from CCD sensors different compared to colours obtained from CMOS sensors?

I heard multiple times that cameras with CCD (I am talking about consumer DSLR) produce more lively or simply more pleasant colours. I think it's a myth but it's not clear to me how much basis it has ...
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1answer
381 views

Sony A7 and A9 Camera Sensor - Why are the edges of the sensor beveled?

I recently cleaned my Sony Mirrorless camera sensor using both a rocket blower and a wet cleaning solution. I was able to successfully remove all the dust/smudges, but I do still have some dust on the ...
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0answers
228 views

What is causing these artifacts in a photo of lightning?

What are the almost pixelated edges in this photo called? What would cause it? The photo is cropped so it stands out more. I find it often happens with highlights with softer edges. You may need to ...
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1answer
487 views

Do Nikon sensor jpegs have a very slight yellow cast to them in the image compared to Canon?

I shoot with a Nikon D3400 and I am a beginner casual photographer. I shoot in maximum quality jpeg(NOT RAW) on auto white balance. Recently my friend and I were shooting some same subjects(my friend ...

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