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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Is there a way to know how much a Sony mirrorless camera was used for video?

I'm willing to buy an "as new" A6000 from someone who said to have quit photography and used this same A6000 for 2 recordings only. I can't visit the seller to see it for myself and I'd have three ...
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3answers
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Can a dSLR sensor be replaced with one that belongs to another model?

My D7200 sensor needs replacement due to scratches and I've called a repair center (not a certified Nikon repair center) and they have offered me a reasonable price (about 200 USD). However, I've been ...
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1answer
211 views

Solid greenish horizontal line is showing on all the pictures captured from canon eos 1100d

How can I get rid of that line? Do I need to send it to service center? Can I use some canon software to manually remove those lines from pictures? This is my first DSLR and it's out of warranty! ...
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Determining the size of the smallest resolvable detail for a given camera

My generic question: Given camera specifications, e.g: sensor resolution, sensor image area, pixel size (area), optical size, focal length (ratio), fov (horizontal and/or vertical) and ...
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1answer
461 views

Do I need to take bias frames for long exposure astrophotography?

I have read many places that for the best calibrated astrophotographs, you should be taking bias frames, dark frames, and flat frames. But on a forum I read the following statement You usually don'...
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3answers
606 views

Effective focal length with crop sensor, and detail of image

I have in fact read the other threads, and I am still not clear on this topic. For any given lens, say a 400mm EF or FX telephoto, I am shooting a subject in low light, for arguments sake lets say I ...
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1answer
259 views

How is ISO and output communicated on CMOS sensors?

CMOS sensors have analog amplifiers for each pixel. To my understanding, the pixels are set on a single wafer which can only handle one communication at a time. ISO values are most likely sent out ...
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2answers
243 views

How close are we to the theoretic limits of sensor low-light performance?

Consider a low-light, high-ISO, short-exposure shot. We all know the image will be noisy. I understand that the image noise is dominated by the photon counting noise (shot noise) that is caused by ...
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Sensor scratch: how likely is this one to cause problems and would it worth a replace

Well, I have scratched my sensor, or since I made research, I'd better say the infrared filter on top of my sensor. I have made sure that this is a scratch after I had my sensor cleaned by the service ...
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1answer
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Would too much sensor cleaning reduce image quality [duplicate]

Would too much sensor cleaning (wiping) impact the sharpness, dynamic range, and color depth?
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251 views

Is this scratch or just dirt?

The things I highlighted in the following photo, are they scratches on the sensor or just dirt?
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Light scratch on sensor: is that fixable

Short question, could a very light scratch on sensor be fixed?
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1answer
146 views

Why doesn't the shutter close (like it does in mirror-up mode) when changing lenses to protect from dust?

I've just noticed a lot of dust on my sensor and I had to send my camera to the service center to get my sensor cleaned. I've noticed that when I use the mirror up mode "the function that prevents ...
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1answer
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Is the Canon G3X sensor larger than the sensor in Canon's G16?

I'm confused by the differences in the literature. In short, does the Canon G3X have a larger sensor than the G16?
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Same focal distance, narrow FOV but bigger sensor. How is possible?

The iPhone 7 Plus, according to the exif, has 4 mm focal distance 28 mm equivalent. The iPhone 8 Plus, according to the exif, has 3.99 mm focal distance 29 mm equivalent. The iPhone 8's field of view ...
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854 views

What's the relation between sensor size and maximum aperture

Is there any relation between the maximum aperture of a lens and the size of the sensor? I'm looking at the smartphone. A smartphone has 4 mm focal length (equivalent to 28 mm) and f/1.6 aperture ...
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Is it true that the best images from all digital cameras can be obtained at ISO 200?

Recently a very professional photographer who shoots stunning pictures told me that the best images can be obtained from digital cameras at ISO 200. He also stated that this is what all the ...
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How to deal with single channel overexposure?

I've been shooting quite a few gigs at clubs/concerts and repeatedly experience issues with scenes lit by small bandwidth lights (for example lasers). These lights cause a single channel to ...
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1answer
815 views

How is spectral sensitivity of a camera calculated?

I understand that to recreate the spectral response of a camera's sensor, you need to use a monochromator/spectrometer to get calibrated images. But I'm not sure where you go from there. When looking ...
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1answer
154 views

Manual Clean 5D Mk3 sensor

I have previously cleaned my Canons sensor manually. My 5D Mk3 is greyed out on manual clean. How do I get this back into operation?
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Black dots appear in photos

First off, I understand that there is another thread with a similar question but mine is slightly different. I have a Nikon D80 and all of a sudden these black dots appeared on my photos. Quick google ...
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1answer
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What do those black image corners mean?

I've downloaded a sample RAW image from the brand new compact superzoom camera Sony DSC-RX10 Mark IV and opened in RAW Therapee 5.2. As the camera is very new, the program doesn't know how to handle ...
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4answers
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Are there cameras that take photos capturing NIR, Visible and UV light?

Basically, is there a commercially available camera (or an image sensor) that can capture all 3 (NIR, Visible and UV) in one photo. There are lots of examples online of people taking pictures in ...
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4answers
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Why does a more expensive camera have fewer pixels?

I compared the specs of some cameras. The Canon EOS 5DS and the EOS-1D X MARK II each has a full-frame sensor. The second is more expensive. Their pixel counts are 8868 x 5792 and 5472 x 3648. Nikon ...
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1answer
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Why no raw channel histograms? [duplicate]

I understand the basic logic of providing histograms of JPEGs. The sensor pixel values get combined, processed, interpreted as a color, then broken out into new RGB values. So, if you were to give the ...
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4answers
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Set ISO sensitivity per channel?

To control color balance in digital camera exposures it would potentially be useful to be able to change the sensitivity of the sensor on a per channel basis, or alternatively to be able to apply an "...
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2answers
671 views

Dust spot or scratch?

I'm a bit worried about a potential scratch to my d7000 sensor as shown in the rather grainy image below. Note the black line in the top left. It is more of a fine line vs. the 'spots' I've seen in ...
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1answer
482 views

Are self-cleaning sensors now standard?

As someone who shoots out-of-doors a lot, I am very pleased to have a self-cleaning sensor. I don't see this feature mentioned much in camera reviews, and I am wondering whether they are now a ...
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1answer
785 views

how to estimate camera film back? [duplicate]

I have to plot a full-hd video (1920-1080) made with a nikon d750 with full frame sensor for a CG and live action compositing. 1 - how can i calculate the physical size of the sensor? 2 - Is there ...
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Why doesn't digital Large-Format exist?

In the digital age of photography, we can see a range of digital camera sensors sizes in use, from 1/3.2" in small phones, up to Medium format sensors that are 53.4 x 40.0mm in size or more! Why has ...
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3answers
830 views

Keeping mirrorless camera sensors clean; tips? [duplicate]

I have a Sony A7S II which I adore; but—like every other camera—it too has its disadvantages. For me, one of those disadvantages is the sensor which is exposed when you switch lenses. And a simple "...
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1answer
614 views

Reason why MFT are less bright than FF cameras? [duplicate]

My understanding is that low-light performance is a function of the amount of light received on the sensor per unit area (correct if wrong). If this is the case, wouldn't an MFT system have the same ...
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2answers
909 views

Reconciling gain (e/ADU), full well capacity and ADC bit depth

I have a CCD sensor datasheet which cites the following parameters in accordance with the EMVA 1288 standard: ADC bits 14 bits Well depth 17273 e- Gain (e-/ADU) 0.17 I'm unable to reconcile ...
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How can I tell if a drop damaged my camera's sensor?

I dropped my Nikon D5500 recently from a height of around 3 ft onto a hard surface. Visibly, there is no damage to the camera. However, having handled some DSLRs, I think it's very unlikely that ...
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What online tools exist to compare image noise between different sensor sizes?

I am currently thinking about upgrading my Canon SX720 with 1/2.3-inch sensor to a compact camera such as Canon G9X Mark II with 1-inch sensor. Before doing that I want to look at some samples images ...
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1answer
263 views

Large difference between number of image sensor pixels and pixels in the image from my iPhone

According to the specifications given by Apple, the iPhone 5s camera has 8 megapixels. I assume that this is supposed to mean that the image sensor has 8 million photosites, and I would appreciate it ...
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4answers
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Can the sun damage the sensor on a mirrorless camera?

I'm researching a good technique for taking pics of the upcoming solar eclipse and I want to use my Sony NEX-6 mirrorless camera. I found this question here from 2010 but no one brings up mirrorless ...
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3answers
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Is it possible for a camera to take different exposures at the same time with different ISO's?

I don't know exactly how ISO works within a digital camera, but from a video I saw, it described it as the camera essentially brightening the image from the sensor, given the same amount of light from ...
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2answers
424 views

does the presence of Moiré in a photo implies the “lens outresolve the sensor”?

I sometimes come across affirmative comments such as "there's moiré in the photo so the lens out-resolves the sensor". But is it true? I would say: moiré in a photo isn't a sufficient indication ...
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1answer
374 views

Canon T5 photos are black

My Canon Rebel T5 recently started shooting all photos with a pink to black gradient. I have taken off the lens and confirmed that the shutter does actuate. This effect is seen on all of my lenses. ...
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1answer
355 views

Strange image artefacts from PS3 Eye camera

I am using PS3 Eye camera (model 5SLEH-00448) to take photos with OpenCV (C++) on Rapsberry Pi. It runs via v4l2 driver that only supports YUYV uncompressed capture mode. I save the images as PNG. I ...
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4answers
641 views

Do full frame sensors have a higher exposure? [duplicate]

I was reading a piece on the comparison of APS-C to full frame sensors. In this article, it mentioned that full frame sensors can have larger individual "photo sites", and can therefore capture more ...
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1answer
834 views

Dust visible on pictures with small aperture

A few months ago I took my then new camera (Nikon D7200) out with a tripod to take some small aperture shots. I noticed a significant amount of artifacts on the resulting pictures. A quick Google ...
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2answers
393 views

What are the bottlenecks in a regular CMOS sensor chip?

To be clear I'm not referring to any processing stage but just hardware. What is preventing me from sampling it at a higher rate? Will it burn out or just start giving me garbage? What is the reason ...
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1answer
996 views

How can I calculate sensor size (width and height) from focus length, vertical, and horizontal angle of view?

How to calculate sensor size (width/height) when knowing focus length, vertical & horizontal angle view (FOV)?
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4answers
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How much light and resolution is lost to color filter arrays?

Color digital cameras are typically implemented by putting a color filter array (CFA) like a Bayer filter, plus an infrared cut filter, in front of a sensor that is sensitive to light frequencies ...
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3answers
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Hot, stuck, or dead pixels. What's the difference?

What is the difference between hot, stuck, and dead pixels with regards to a camera's image sensor? What can cause each to occur? What can be done to reduce their influence on a photo?
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5answers
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When comparing camera sensors, what does [x] µm Pixel mean, and what does it say about image quality

In this article (sorry its german) I read about camera sensors. They show values like 1,4 µm Pixel, or 1,55 Pixel. What does this mean, and how is it related to sensor size? If I got it right, a ...
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3answers
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Can all colors be described with RGB?

If one could pick ideal sensitivities for the RGB filters of a camera sensor, would it be possible to capture any color as humans see it?
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Can we compare the color reproduction accuracy of 2 camera sensors only by looking its sensor spectral sensitivity curve?

I have the camera specifications from the manufacturer. The RGB quantum efficiency curve (I think it is also the spectral sensitivity curve) is provided. How can we compare these two cameras's quality ...

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