Before the rush

Before the rush
by evan-pak

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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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1answer
665 views

What is the native color gamut of a modern digital sensor?

What is the area of CIE 1931 diagram that is being covered by contemporary digital camera sensors? I can find triangles for LCD panels being comapred to sRGB and aRGB and ProPhoto. There are always ...
4
votes
2answers
128 views

Does Stopping down affect the performance of the sensor's AA filter?

I noticed a while back that with a lens stopped right down (say f16-22), any dust on the sensor becomes much more noticeable and "focused", and wide open (say f1.4) it is practically invisible. This ...
4
votes
1answer
767 views

What are the right cleaning tools for an APS-C sensor?

I have got my gear ready for a long holiday in next month, but I'm pretty much confused when it comes to having the right tools for cleaning a sensor. The typical procedure I have experienced from ...
3
votes
3answers
182 views

How is shots per second of a camera is measured?

I was just curious to know what are settings used in testing the camera's shots per second?Especially the shutter speed. Whether its set to the camera's maximum capability or any standard shutter ...
3
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2answers
347 views

The Lowdown on Image Quality on DSLRs

I have seen sites that use measure DSLR performances with Image QUality (in numbers). So I was thinking, given a D800 and a D7000, with the same lens, the same lighting condition and many other ...
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2answers
748 views

Assuming a perfect sensor, what is the physical limit of ISO/pixel area?

Assuming that camera manufacturers can eventually make the perfect sensor that introduces no electrical noise to the signal, at what point (measured in ISO/area of a pixel) will shot noise be so ...
3
votes
3answers
966 views

Canon 1Ds Mk II's scratched Low Pass filter. Now what?

Besides our workhorses (Canon 5D3 and 60D), we have an old camera - Canon 1Ds Mk II which has its OLPF scratched. That is, the camera works (ok, more or less because the signs of time are present on ...
3
votes
4answers
5k views

Sony NEX5: Why do I have a dark spot in my images? [duplicate]

When I look through the display, I see always a small grey circle at the same place. Also in the picture it's the same circle. When I change the lens, the circle is still there. So I assume it's ...
3
votes
4answers
250 views

Can exposure be bracketed by many sensor readouts during single exposure?

I am getting into some HDR photography and was thinking of a new ways that camera manufactures could help us in capturing HDR pictures. Say you want to capture three image and you have a constant ...
3
votes
1answer
249 views

How close are we to the sensor pixel size limit?

Given the wavelengths of light we see, presumably there is some limit of pixel size below which we cannot resolve – i.e., packing four pixels into the area of one pixel would not be able to ...
3
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2answers
920 views

Does front-curtain sync put blur in front of an object, and rear-curtain sync behind it?

I recently watched Adorama's video on rear curtain sync flash photography. At 4.12 to 4.42, the presenter claims that when using front-curtain sync, the background/long exposure blur will be put on ...
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votes
1answer
715 views

How to clean spit off my camera sensor?

A short while ago, I [foolishly] attempted to clean some specs of dust from the sensor of my camera by blowing on it. While this was successful in removing the dust, I inadvertently spat on the ...
3
votes
1answer
823 views

Why is there a vertical lines pattern in noise?

Take a look at this image (shot with a Nikon D60). The shadows have been aggressively brightened to make the noise clearly visible. If you look closely, you'll see that the noise is not completely ...
3
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2answers
4k views

Can video shooting have a negative effect on a DSLR sensor?

When compared to shooting still photographs, does shooting video have any negative effect on DSLR sensors? For example, I wonder if shooting video may produce more heat, which might be harmful for ...
3
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2answers
3k views

Nikon D5100 half bright-half dark image with horizontal thin black line

I am getting half bright-half dark image with horizontal thin black line on my Nikon D5100. Does anyone has any idea ? i am extremely worried. Warranty just expired. I have sample images uploaded at ...
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2answers
577 views

How is the spectral response of a camera typically measured?

I cannot find any resources that detail a standardized method of measuring the spectral response of a camera. Does such a standard exist? Does anyone know how to do this? To give some context, I'm ...
3
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2answers
573 views

Does high reflectiveness of digital sensor lead to poor lens performance?

I Googled film vs dslr and found an article from 2007 that said: Digital sensor has higher reflectiveness than film. The light bouncing back from sensor will cause flare and lead to poor optical ...
3
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2answers
204 views

Are these weirdly-shaped purple stains really from particles under the first layer of the sensor, and if so, what can I do about it?

I have those little particles on my pictures. There are a lot of them, as you can see, and they have different weird shapes: I already sent my camera for a sensor cleaning and the guys at the shop ...
3
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1answer
88 views

Sony Full Frame E Mount Sensor Corners

Context I've seen the Canon 5D Mark III, Nikon D750 and A7R before. The sensor placement of the Nikon and Canon reveals the whole sensor if you look "down" the mount on the camera. On the A7r though ...
3
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1answer
131 views

How fast does a sensor cool down sufficiently after a long exposure?

If I am taking long exposures for star trails how long should I wait between exposures to allow the sensor to cool down?
3
votes
1answer
775 views

Could a damaged sensor cause stripes on the image?

Today I discovered that my camera has started to save pictures like this: But, when I use the camera viewfinder, everything looks fine, both via LCD and via the EVF. I thought it could be the SD card,...
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0answers
47 views

Are there industry standards or specs for image sensor resistance to damage from intense light?

While the occasional snapshot that includes the sun is generally safe, there are certainly combinations of lens and duration that can damage an image sensor if the sun or other sufficiently bright ...
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3answers
4k views

Does the Canon EOS Rebel T5/1200D have any dust related problems?

I’m planning on purchasing the Canon EOS Rebel T5/1200D very soon. It’s the only DSLR that fits my budget (other one is the Nikon D3100 which I don't plan to get). I like everything about the camera ...
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0answers
185 views

Why is there a grid pattern of darker pixels in this twilight sky flat field? [closed]

This is the first time that I'm really inspecting the calibration images we were taught to take/use during data reduction, and I've noticed something in all the flat fields. The image below clearly ...
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4answers
2k views

Shooting 50mm EF vs EF-S

I have a Canon EOS 550D with a APS-C sensor. I have two lenses, (1) Canon EF-S 18-135mm f/3.5-5.6 IS and the (2) Canon EF 50mm f/1.8 Mk II. If I use the 50mm focal length in the first EF-S lens... I ...
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5answers
319 views

Why does it seem like large sensors are necessary for good low-light performance?

Phone manufacturers have recently started advertising the size of the photosites on smartphone camera sensors. They argue that larger photosites lead to better low-light performance. I think a good ...
2
votes
2answers
1k views

How does sensor size relate to image resolution?

How is it possible that with a particular sized sensor (say APS-C) it is possible to get different sized image cameras (by this I mean a 10 megapixel camera, a 15 megapixel camera etc)? Where does ...
2
votes
3answers
634 views

Which camera/lens combination achieves the highest possible image quality for macro?

Doing lots and lots of research I have a hard time time finding the ultimate answer to this question. I would like to shoot macro and products and aim for maximum sharpness and reproduction. Maximum ...
2
votes
2answers
395 views

What is the meaning of “cropped sensor”?

What is the meaning of the term "cropped sensor"?
2
votes
2answers
912 views

Dust on the sensor, should I be worried?

I did a 30 second long shot without the lens and checked the sensor and saw some dust on my sensor (even though camera has sensor cleaning). I didn't see any defects on photos yet, but is it something ...
2
votes
4answers
111 views

Can the same sensor have different dynamic range and color depth in different camera makes?

The Nikon D7000 and Sony A55 were found to have the same sensor. But during testing, which I understand is subjective- DxoMark (dubious reputation, I'm aware) revealed that the D7000 has a much ...
2
votes
3answers
345 views

Will a macro extension tube eliminate the cropping of an APS-C lens on a full-frame sensor?

I understand using an A-mount lens intended for APS-C sensors on a full-frame camera results in cropping of the image. According to a tech at Sony, you lose 1/3 of pixels (APS-C is a 2/3 sensor so it ...
2
votes
1answer
199 views

What are the main limiting factors for dynamic range in modern cameras?

Another question got me thinking about what is limiting dynamic range in digital cameras. From my understanding the precision of the analogue-to-digital converter, i.e. how many discrete levels it can ...
2
votes
3answers
243 views

If I set my camera to lower resolution, does that mean more sensor area per image pixel?

My camera is the Nikon D3200 and the specs state that it has a Sensor Pixel Area of 14.85µm2 @ 24MP. When i set my camera to JPEG (fine), I have the ability to set the picture size. Would setting it ...
2
votes
2answers
477 views

Sony A7R Noise compared to Nikon D800/E Sample Explanation

I am looking for a high resolution camera for fine art prints and the Sony A7R seems great since it has the same Sensor res as the D800 in a smaller enclosure. For some reason when I look at sample ...
2
votes
2answers
581 views

Can an Optical Low Pass Filter be applied via a lens filter?

I constantly see references to video being the application where an Optical Low Pass Filter is most useful, but it seems that still images do best without one. Would it be possible to then have a ...
2
votes
2answers
318 views

What makes the Foveon X3 a “direct” image sensor?

In marketing materials mentioning the Foveon X3 sensor, I usually see it referred to as the "Foveon X3 direct image sensor" (example): I understand how the Foveon X3 sensor works (stacked ...
2
votes
2answers
211 views

Why don't sensors on satellites and rovers degrade as quickly as DSLRs on the space station?

I just saw a report on NASA TV that said that dSLR cameras are replaced every 12 to 18 months because of the large number of dead and hot pixels, but video cameras last much longer, and they were ...
2
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1answer
1k views

how does full frame cameras give better bokeh than crop sensor? [duplicate]

Possible Duplicate: When do the differences between APS-C and full frame sensors matter, and why? Why does a bigger sensor lead to a shallower depth of field? When I compare my camera which ...
2
votes
1answer
626 views

Why might my camera show spots in video mode?

I own a Canon Rebel T1i, and when I try to record video, there are two dark spots on the screen. These do not appear when I take photos. Video (spots in center and right center): Photo: Does ...
2
votes
2answers
69 views

Pixels and Subpixels usage in TIFF and RAW

The first answer to this question says that when saving images in TIFF, each pixel holds three colors' data and because of that, the file is larger... and RAW only hold monochrome data in each ...
2
votes
1answer
94 views

Contradiction in information resources on capturing UV light with a digital sensor [duplicate]

I encounter a contradiction. Many resources state that a digital sensor are unsensitive to UV light. Even wikipedia, "However, newer photographic film and digital cameras are highly insensitive to ...
2
votes
3answers
9k views

How can I easily tell if a sensor or lens is damaged?

I am pretty interested in recognizing any damage to digital camera in very low level (without any advanced tests). For example, how can I identify the damage of a sensor or lens? If there are any ...
2
votes
2answers
162 views

Canon APS-C: what is the maximum sensor size EF-S lenses are designed to support?

Given that Canon APS-C cameras differ in sensor size (e.g. 70D has a 22,5 x 15,0 mm and 700D has 22,3 x 14,9) is it possible for future models to switch from a 1,6 to 1,5 factor like Nikon crop ...
2
votes
1answer
172 views

How Does A 5D Mk3 Generate The Histogram It Displays In Live View?

What is happening under the hood when a 5D Mk3 displays a histogram (luminance or RGB)? What exactly is the data it uses (raw sensor data, jpeg or something else)?
2
votes
1answer
308 views

How do digital sensors that capture one color at each photosite compare to sensors that capture many colors?

There are different type of digital camera sensors, those sensors that can capture only one color at each photosite and those who can capture more than one color at each photosite. Which one is ...
2
votes
1answer
805 views

Why does my Nikon D90 make a strange sound during built-in sensor cleaning, when my friend's D90 doesn't?

I noticed a quiet sound (like squeaking) when using the built-in sensor cleaning of my Nikon D90. In some forums I read about many people having this behavior with the Nikon D700 and some Canon ...
2
votes
3answers
144 views

What causes noise floor in an image sensor?

In the book Image Sensors and Signal Processing for Digital Still Cameras, it says that Read noise, or noise floor, is defined as noise that comes from the readout electronics.Noise generated in a ...
2
votes
2answers
88 views

Is the anti alias filter really a blurring filter?

I'm trying to dig into the nature of how the anti aliasing filter works. This is of importance to me as I need to capture small details at the very edge of the resolution limit of the cameras lens as ...
2
votes
2answers
386 views

What determines the fastest shutter speed for an electronic shutter?

I tried my luck over at Robotics but didn't have any luck finding somebody knowledgeable. Somebody therefore suggested to post the question here again. I understand that there are different types of ...