Spring 2012

Spring 2012
by ani

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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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491 views

What *exactly* is white balance?

When setting a white balance configuration, we adjust the temperature and green-magenta shift to a wavelength-intensity distribution of light that correlates most closely with the actual distribution ...
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3answers
949 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 ...
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1answer
291 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 ...
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2answers
537 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 ...
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5answers
390 views

Why do cameras use a slit between two curtains rather than exposing the entire sensor instantly?

Why is it more effective to use "a slit travelling from top to bottom of the sensor" in faster shutter speeds, rather than exposing the entire sensor instantly? And the slit thing only comes in fast ...
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6answers
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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 ...
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3answers
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How linear are DSLR sensors?

To be more precise, let's say we are taking a W&B photograph. Picture 1 : And let's say we take it once with a 1/1000 shutter speed, so that the values for R/G/B range from 0 to MAXVALUE / 2 ...
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8answers
2k views

What is Snapsort's “true resolution” score?

On Snapsort I found this explanation: True resolution Manufacturers advertise high megapixels to sell their cameras, Snapsort calculates the true resolution of each camera based on the ...
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2answers
865 views

Black dots on all photos

I took this image with a phone (some Sony). The lens is clean on the outside. The owner of the phone says those black dots started appearing and supposedly are multiplying. Is it some dust in the ...
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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 ...
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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 ...
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3answers
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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 ...
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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 ...
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1answer
301 views

In terms of “image quality”, is the sensor the only spec of a DSLR I should look at when shooting RAW?

There are so many specs which don't have any influence on your RAW file. I'm trying to isolate the factors that matter for image quality only. For example, I'm not sure about the processor : of ...
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2answers
351 views

Are these spots on the sensor or the lens? [duplicate]

Equipment is Canon EOS 5D3 (5760x3840) with a 24-105 f/4 L lens at 105mm, ISO 200. The following are crops from the same small (676x449) section of a couple of blue sky shots I did to test for sensor ...
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1answer
1k views

What camera companies make their own sensors?

Is it public knowledge what manufacturers make their own sensors and what import it from others? I heard somewhere that Sony manufactures Nikon's high end sensors, but don't know about the others. ...
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2answers
9k views

What causes banding noise?

I'm looking for information (and references) on three related topics: What causes banding noise in CMOS sensors? What is the physical/technological cause? Is the cause the same in CCD and CMOS ...
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2answers
1k 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, ...
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1answer
276 views

What do “dark current” and “sensitivity” mean for a camera module?

I am looking at a camera module to be used for a project which deals in shooting frames in dark areas and night conditions. This is a camera used from a circuit board. I have the following light ...
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3answers
875 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.
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1answer
306 views

What settings should be used for self-cleaning sensors?

This question mentioned a self cleaning sensor. I have a few questions in reference to self cleaning sensors. Is there a reason to clean the sensor at startup, shutdown, (or both) automatically? Can ...
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2answers
496 views

When is it more suitable to have a full sensor-camera instead of a crop sensor-one?

I've been reading about this a bit, and I get the sense that full sensor-cameras are best suited for shooting landscapes, whilst crop sensor-cameras are preferable for portraits and close-ups. Please ...
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1answer
782 views

Can I clean dust from a scratched sensor?

I have a camera with a scratched sensor (a Canon 1Ds Mk II) - can I clean the dust from the sensor? And if yes, how? By using the wet method? Or just by blowing air? The scratch is in the middle. ...
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1answer
910 views

Does this look like a sensor problem?

I have these tiny dots in a lot of my pictures. They look like tiny stars. On this Nikon D60 I've tried cleaning the area where the shutter is (what's this called?) with a hand pumping duster, but ...
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2answers
470 views

Is “Ultrapixels” just marketing or is there a real benefit?

HTC has branded the sensor in its new phone (the HTC One) to be "Ultra pixels". For the same sensor size it only gives you 4MP where today's standard for top of the line smartphones is 8MP and up. Of ...
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2answers
165 views

What is the nature of noise in small-sensor cameras, and can it be overcome in the future?

What is the physical nature of noise in small-sensor cameras? Is it thermal noise in the semiconductor? Is there hope that in a couple of years, noise in small sensors will disappear, and small ...
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2answers
6k views

GoPro Hero HD field of view is larger at lower resolutions, how is that?

How is it that the FOV can be greater for the smaller resolutions in their camera, which has no zoom? I would expect a greater FOV when more of the sensor is used. From: http://gopro.com/cameras/hd-...
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2answers
170 views

Why some pixels become hot pixels?

What is the physical explanation to hot pixels? What happens to the sensor when a good pixel become an hot pixel?
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1k views

Convert RGB camera to infrared, but 3 channels not just 1?

A common way to make an infrared camera is to remove a commodity camera's IR-blocking filter (and add another filter to block the visible spectrum). Is there a similarly cheap way to convert an RGB ...
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7answers
1k views

Why don't sensors have a wider aspect ratio?

than 3:2, like 16:9 or 16:10? Given the popularity of widescreen TVs and computer monitors with wide aspect ratios, and that most photos are viewed on a screen, rather than printed, and that the eye ...
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4answers
832 views

Why does BRIGHT red in direct sun come out orange?

I was at the NEC today dropping off a car for an auction, and took this quick photo (no intention to use for anything so no attempt at composition!) This was taken on a LG Nexus 5 mobile phone. I ...
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6answers
3k views

Is small sensor always a bad thing?

I own a DSLR. I want to buy some not-too-expensive compact, and there are a lot of compacts in the range 100-250$ with 1/2.3" sensors. Can such a sensor/camera set give a quality somewhat comparable ...
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2answers
649 views

What is this dead pixel problem really called?

On all photos from my last vacation I see this red point. It appears on in-camera JPGs as well as on RAW files. A see a red pixel in the same position on all pictures. How is this problem called? Is ...
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2answers
2k views

How does a sensor cause vignetting?

Vignetting is usually assigned to lens characteristics, or caused by light-blocking objects in front of a lens, like lens-hood or a filter. Is there vignetting (or vignetting-like effect) caused by ...
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2answers
530 views

Does the Nokia Lumia 920 truly present any significant advancements in cameras?

Nokia is touting the new Nokia Lumia 920 as a breakthrough on many fronts for digital photography, even going so far as to say that it can achieve DSLR like results. Of course one of the things that ...
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2answers
345 views

Why does the Pentax K-01 have less DR than the Pentax K-5?

I thought that the K-01 and the K-5 both sported the same sensor, but checking their specifications in Snapsort I found that their Dynamic Range is different by a little bit more than 1 EV (12.9 EV vs ...
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2answers
460 views

What is the effect of long exposure on file size?

Is it a rule that long exposure will produce a larger size file compared to a shorter exposure? It seems logical, since you are writing more data to the memory card when you expose for more time. ...
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4answers
630 views

Can condensation be formed in the camera sensor?

When entering a hot place after leaving a cold place, some condensation can be formed in the lens and manufacturers recommend you to avoid using the equipment in this state. So, if condensation can ...
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3answers
302 views

What are the RGB primaries in a camera?

More generally, what is the nature of the gamut? Primaries as peak sensitivity don't behave the same as primaries for mixing output. I suppose this is necessary to know for RAW importing and would be ...
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2answers
3k views

Why is on sensor PDAF drastically slower than traditional PDAF?

Why is on sensor PDAF drastically slower than traditional PDAF? I assume the technology is the same, doesn't matter if the module is on the sensor or located behind a mirror. But the performance is ...
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1answer
196 views

What is the benefit of the sensor marker?

I know that this marker on my Canon EOS shows me where my sensor is: Form technical point of view this is interesting, but is there benefit for me as a photographer to know exactly on which level ...
4
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1answer
788 views

How to show Sony NEX F3 image quality is better than Nikon 1 J1?

According to this site, Sony NEX F3's sensor is 3x as large as Nikons, and it's image quality is 73 vs Nikon's 56 (how on earth do you come up with a number for this?). I have been experimenting with ...
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2answers
3k views

What is the structure of a photosite?

I know that sensors are made from several (million) photosites. But what is in the photosites? What chemicals, if any? How are they made? What actually detects the light? I am looking for both CMOS ...
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1answer
164 views

Can lens stacking cause sensor damage?

Can damage be caused to a camera's imaging sensor (any size) simply by reversing, or stacking, lenses? Would stacking lenses cause a concentration of light to strike the sensor and perhaps damage ...
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1answer
1k views

what's the relation between sensor size and image quality (noise, dynamic range)?

I'm reading this description on sensor size: Digital compact cameras have substantially smaller sensors offering a similar number of pixels. As a consequence, the pixels are much smaller, ...
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1answer
3k views

Which digital cameras are using which sensors?

I was surprised to learn from http://photo.stackexchange.com/a/3434/4795 that Sony built sensors are used by a few major camera manufacutrers (eg. Nikon, Pentax...) Does anyone have a list or a link ...
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88 views

What factors affect the dynamic range of a sensor?

I understand what dynamic range is, but I'm interested in what it is that allows different sensors to have increased dynamic range over other sensors. For example, the classic explanation of a sensor ...
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3answers
552 views

Shooting images smaller than the sensor size

I have a d600 and I appreciate very much the high resolution I get (useful especially for landscapes), but for most other subjects I find 6000 x 4000 to be overkill, making post-processing ...
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1answer
267 views

Are the perspective control advantages of a tilt shift lens less important on higher resolution cameras?

When using a tilt shift lens for perspective control, you can use shift to help account for converging lines such as in a scene of a church from 100ft away. I can also handle this type of perspective ...
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1answer
634 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 ...