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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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2answers
9k views

What is the Chief Ray Angle (CRA)?

I want to select image sensors for a particular application. One term that I have come across regularly in their datasheets is the CRA. I was comparing 2 image sensors and although they were of ...
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4answers
3k views

Given the same lens, does shooting with FX cameras yield sharper results than DX cameras?

I have a D7000, and I want to buy a D800 sometime next year because of a "foolish idea" that FX cameras yield sharper images over DX cameras. I am quite new to photography and did my research. ...
9
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2answers
4k views

Why don't comparisons of aperture take sensor size into account?

When one compares focal length, many times we use the 35mm equivalent length. A 50mm lens on an APS-C sensor camera(1.6x) would be a 80mm equiv. length on a full frame camera. But when we state the ...
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3answers
3k views

Does change of lens affect a camera's megapixels?

I have a Nikon D40. It has only 6.1 MP. I am planning to buy additional lens for it. Can changing the lens of the camera increase or decrease the megapixels of the camera?
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4answers
2k views

Where is the color mosaic filter on a DSLR sensor?

I have been looking at this tutorial from Astostuff on taking off the hot mirror on a D70, but cannot figure out from the page where the color mosaic filter is located. Is it possible to remove the ...
9
votes
1answer
373 views

Where is this dust located on my sensor?

I have a really nasty looking piece of dust on my 550D's sensor, situated in the top right-hand corner of each image I take with anything higher than f/11. I am going to get a decent sensor cleaning ...
9
votes
1answer
949 views

Can the slant edge SFR method measure lens resolution greater than the Nyquist limit for the camera sensor?

The slant edge SFR method has become the standard for measuring resolution of lenses and camera systems. It works by scanning a five degree slanted edge to calculate a line spread function. This is ...
9
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0answers
364 views

What does expanded ISO mean?

Especially with regards to image quality. I am particularly interested in when you expand to a lower ISO, say 50 rather than 100. Generally the standard high ISO is too noisy, with the expanded ISO ...
8
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7answers
1k views

Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR?

People keep inventing different form factors and formats for cameras, but none seems to have hit on what seems (to me) like an obvious one. Why doesn't somebody build a camera with a sensor that has a ...
8
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6answers
530 views

Why is the main sensor not used instead of the separate AF sensor to focus a DSLR?

From this answer I understand that the reflex mirror of a DSLR is actually not reflecting all the light, but it passes a certain amount on to the AF sensor. So if the reflex mirror can pass light, ...
8
votes
4answers
2k views

How many bits of data are typically actually captured by a digital camera sensor?

In a comment on this question someone suggested that camera sensors typically only output 12-14 bits of data. I was surprised because that would mean that 24 bits of color is only useful for doing ...
8
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3answers
1k views

How relevant are the DxOMark scores and tests?

To me the DxOMark sensor rating seems a bit bizarre. They recently rated the sensor of Nikon D3300 to the same score as the Canon 1Dx got which I find unlikely to reflect their performances, and which ...
8
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4answers
6k views

How effective are in-camera integrated sensor cleaning systems, and have they improved?

Few years ago, Canon introduced some sort of internal sensor cleaning system that (as far as I understand it) shakes the sensor off any dust it collected during use. This shake is very high frequency. ...
8
votes
2answers
784 views

Why doesn't a Medium Format camera exist with good performance at high ISO?

I have had a look at enough medium format offerings, but all the products seems to offer many megapixels and poor performance at high ISOs. Why doesn't a brand exist to offer slightly lower ...
8
votes
2answers
469 views

Nice cameras for B/W photography?

Considering that most people cannot afford a Leica Monochrom, are there any other cameras that are better suited than average for Black and White photography? I mean, some sensor designs emphasize ...
8
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2answers
989 views

Why are sensors less sensitive to blue light?

This is a followup question to Why is the blue channel the noisiest?. The simple answer to that question is that sensors are less sensitive to blue, and therefore require more amplification, which ...
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3answers
2k views

Does a 35mm prime lens show the same bokeh as a 50mm prime lens on a cropped sensor?

I came to know that a 50mm prime lens on a cropped sensor behaves like an 75mm prime lens. So, does the 35mm prime lens behave like a 50mm prime lens on a cropped sensor? If yes, then will it show ...
8
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1answer
5k views

How to fix an image sensor damaged by long sun exposures?

I took a number of shots of the sun during mid-afternoon and now all my images have pink spot where the sun was. Is there anyway to fix this, or is it permanently damaged? The camera was pointed at ...
7
votes
7answers
1k views

Does a larger sensor resolution increase the difficulty of shooting hand-held?

I'm thinking of upgrading to a D800 and I think I read something about the 36MP resolution of the sensor to be a liability when hand-holding the camera at lower shutter speeds. Unfortunately I cannot ...
7
votes
5answers
567 views

Why is there no full-frame but low res sensor?

So I just watched a review on the Sony NEX-7, which is 24MP in APS-C size.... I am a Canon user and I immediately think about the announced Canon Powershot G1X with almost APS-C sensor but at a lower ...
7
votes
5answers
525 views

Why are there no rotatable sensors instead of grips for portrait photography?

Why are there (at least to my knowledge) no rotatable sensors instead of grips for portrait photography. It seems like a great solution to obtain a lightweight DSLR for both landscape and portrait ...
7
votes
4answers
603 views

Has low-light ISO performance really improved over the past 3-4 years?

I have a Canon 40D and I always shoot RAW. I am overall pleased with the 40D except for its low-light performance. Anything at or above ISO 800 is unusable for my taste. Just to solve this problem I ...
7
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3answers
1k views

Loss of image quality after sensor cleaning?

I use a 550D for photography. I got dust in my sensor few days ago while I was doing reverse macro and cleaned it from Canon Service Center. After cleaning I checked my sensor (taking picture of blue ...
7
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2answers
322 views

Why don't mainstream sensors use CYM filters instead of RGB?

From what I understand most digital cameras have a sensor where each pixel-sensor has three sub-sensors, each one with an R,G and B filter. RGB is obviously the more fundamental colour model since it ...
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4answers
1k views

Is a self-cleaning sensor necessary when using only one lens?

The Canon 1100d lacks a self-cleaning sensor. If I use this camera without ever exchanging the lens, is the absence of a self-cleaning sensor a bad 'feature'? Are the bodies of modern DLRS cameras ...
7
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1answer
5k views

What effect does UV filter provide?

I know that I should always use a filter on my lens to protect the camera lens, however, exactly what impact to the picture does using a UV filter have since that is the one most often used? Do I ...
7
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2answers
738 views

Why does my sensor require frequent cleaning?

I have a Nikon D300 and in the past couple years I've found that it seems to require sensor cleaning very frequently, something like once a week or more. I've been dry cleaning with a combination of ...
7
votes
3answers
730 views

Is Poisson Noise (“Shot Noise”) a significant source of noise for typical photography?

In this answer, @jrista states that even a camera with a perfect, noiseless sensor would still have noise due to "Poisson noise" aka "Photon Shot Noise" - noise caused by the random variations of ...
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2answers
290 views

What are the lens-mount benefits of mirrorless systems?

There are plenty of comparisons between DSLR cameras and mirrorless/EVIL/system cameras, and the overall picture is that the two systems target different users and different uses. But I'd like to ...
7
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1answer
3k views

OEM Camera Sensors for a computer project

First off I'm not sure if this is the place for this question, but it seems to be the closest fit. I want to buy a small camera sensor (like for netbooks/phones), from what I have read on wikipedia ...
7
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2answers
999 views

Why don't point & shoot cameras employ the oversampling technique of the Nokia Pureview 808?

From the reviews, the oversampling technique employed by the Pureview 808 seems to work really well, making good use of the 41 MP sensor to create saner resolution images of higher quality. I was ...
7
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1answer
308 views

Are there bad effects of frequent pixel-mapping?

I read on two different sites that pixel mapping should be done once or twice a year. But sometimes I end up doing it once a month. Will it have adverse effect on the CMOS image sensor?
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3answers
1k views

Why are there no digital cameras with ultra-bright integrated lenses, like f1.0, f1.2 or even f1.4?

Why are there no digital cameras with ultra-bright integrated lenses, like f1.0, f1.2 or even f1.4? One would think that with smaller sensors vs. film, it would be much cheaper to build an ...
6
votes
3answers
2k views

Image quality when using the same lens on 16Mpix vs 24Mpix

I'm considering buying a new camera and my two candidates are Nikon D7000 and Nikon D7100. I heard that 24Mpix sensor needs very good lens to produce sharp images. Considering that I currently have ...
6
votes
3answers
508 views

Fancy technology cropped vs old technology full frame - Which will give better images?

After selling my 1Dmk2 last year the time has come to get myself a new body, all along I'd decided that I wanted to do more "wow" pictures, big landscapes and do some more portait photography (up ...
6
votes
1answer
270 views

Why does my sensor flip up slow on live view?

I have noticed some strange behavior on my 450D tonight. I was shooting some macro on Live-view(couldn't get low enough using the viewfinder) and I noticed that after my shots(approx. 2-second shutter ...
6
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3answers
549 views

How do I get rid of these different spots after sensor cleaning?

I've just cleaned sensor on my Nikon D40x for the first time using sensor swabs and Eclipse solution. Here is a picture taken before cleaning and after . Dark spots on the first photo do not appear ...
6
votes
1answer
569 views

Where is the AF sensor located in a DSLR?

As I understand every DSLR has a separate, smaller sensor that handles phase detection focusing. Where is it located? If this location is different for every DSLR, and therefore this broad question ...
6
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5answers
475 views

What companies offer an IR camera filter?

I'm planning on converting a Nikon D50 to dedicated infrared, replacing the internal IR cut filter with one that will block visible light, and pass infrared. Google has turned up a couple sites, and ...
6
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2answers
400 views

Are there digital cameras with a RGBW sensor?

I have seen on Dpreview that fujifilm has been granted a patent for a new type of sensor with a strange non-Bayer pattern. Thinking about it... Is there a camera using a simpler Bayer RGBW pattern? ...
6
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3answers
525 views

How to clean an actual CMOS sensor? (Not the IR low pass filter)

All of the "sensor cleaning" instructions I've found are actually for cleaning the IR low pass filter in front of it. Unfortunately, I've got a tiny bit of tape residue on the actual CMOS sensor of ...
6
votes
1answer
192 views

What characteristics make a digital sensor good?

Generally, the technical image quality of a digital image (before we get to the post-processing stage) is the product of the characteristics of the lens and the recording medium, with an important ...
6
votes
2answers
231 views

What are these strange lines on images from my Fujifilm FinePix F850EXR?

My camera recently started displaying lines on captured images along with some discoloration (you don't see the lines or any discoloration when simply looking through the lens). There was no ...
5
votes
6answers
937 views

Have cropped digital sensors reached their peak design limits?

APS-C and smaller sensors seem to have plateaued off in terms of their megapixel counts, possibly due to diffraction limits. The ISO performance of these sensors has not increased substantially in the ...
5
votes
2answers
1k views

Is it sensor damage? Or dust?

I have been trying to shoot partial solar eclipse today with my Nikon D3100, and later noticed this spot on images: http://pix.academ.org/img/2011/01/04/70baea815d1557594f096a82ab05704f.png I do not ...
5
votes
2answers
4k views

Why is the sensor size small in D3100 as compared to D3000?

I thought Nikon D3100 must be more advanced than D3000 (because of the higher number and the increased price). But, the D3000's sensor size is 23.6mm x 15.8mm and the D3100's sensor size is actually ...
5
votes
3answers
2k views

How common are hot pixels on new cameras?

How common are hot pixels on new cameras?! I read that people may check up to 5 cameras at stores to actually find a perfect one, is this true? so how commons is this? what is the chance of getting a ...
5
votes
3answers
2k views

Can you use alternative brushes to clean DSLR sensors?

A lot of praise goes to Arctic Butterfly when doing DIY sensor cleaning. However are there cheaper solution to brush off dust by using other non-sensor cleaning specific brushes? Most high quality ...
5
votes
2answers
541 views

What are causes for image sensor getting heated? Does Live View cause more heat?

As I have known so far, image sensor gets heated when being exposed to light for longer time. Is there any other reason why an image sensor gets heated? Does heating depends on sensor type (like CCD, ...
5
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3answers
547 views

How are pixel value and intensity related?

How does the value of a pixel at any point correspond to the intensity of light photons striking at that point? Is there any mathematical relation between these two? 1 pixel value = ?? lumen.