Butterfly

by Rodrigo

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0

Depending on the camera, you can read the sensor temperature from makernotes using exiftool. See, for example, Olympus tag 0x1007 here. ths is right: intervals between exposures may leave gaps.


4

The spot removal tool is what you want, you can either click to heal spots or drag for things like hairs.


0

Laser pointers for presentations are typically in the 5 mW range. Lasers used in concerts are substantially stronger (10-10000x). Those have been shown to permanently damage a digi cam sensor (usually straight burn lines across the entire sensor). I haven't done any tests, but can't imagine sensors being damaged by small laser pointers. Given @Menace's post ...


3

Various sources indicate that average reflectance of surfaces is somewhere between 12-18%. Calculating exposure from table values is not very typical. Most photographers would use a light meter, either built in or external.


2

What is the area of CIE 1931 diagram that is being covered by contemporary digital camera sensors? The raw values are not colors per se and the concept of gamut is not working well with raw output of digital cameras. The data become colors after raw development, which depends on many factors. That said, I was wondering what is the outcome of my ...


7

Luckily I have a D80, so I tried to replicate your experiment. Unfortunately: It was during the day; I was in my garage, though it has a window from which some light leaked inside; My cabinet is wooden, not steel; My lens is a Sigma 18-50 f/2.8, unlike yours ;) But I did use the lens cap, I did close the cabinet, and I set the aperture at f/22, just in ...


8

I recommend this paper for possible explanations. It’s about the Pancams used in both Mars Exploration Rovers. It describes a thorough examination of noise sources in CCDs and describes the detailed calibration routine for the Pancam CCDs. Here is the Link to the paper: Mars Exploration Rover Athena Panoramic Camera (Pancam) investigation (PDF Document) ...


31

First, understand a couple of things: Even though we call these things "digital cameras," the process of turning photons into numbers is entirely analog. Analog circuits pick up all manner of noise from their surroundings. Noise isn't one constant value, it's a range of them that top out at a level called the noise floor. The processing you did on the ...


11

This is basically noise, but from several different mechanisms. Consider the extreme amplification of small details you had to apply to get this picture. There are several distinct source of noise here. The overall graininess is random noise from individual sensels. This is going to happen. Every sensor has some finite random noise added to whatever ...


-1

The image was taken with the lens cap on What is the partial circle apparent in the bulk of the frame? It's the lens cap.


23

Maybe it represents the small variation of the temperature of the sensor. A hot sensor produces more noise than a cool one. The small temperature difference can be explained by the presence of electronic components, or the way the sensor is in contact with other parts, allowing more or less heat dissipation. Some related links : ...


8

Is the lens cap the center-pinch style? Seems like you can see the contours of the cap in green. If so, the other visible shapes (circle) are probably due to lens features as well. Try removing the lens and shoot with a body cap attached to see how the image changes. The white portion could be light (IR, maybe) leaking in through the view finder. My camera ...


4

Our eyes and brain do things on a daily basis that make LSD's effects seem relatively tame. One of the things our brains do is a color balancing activity of their own. No one knows why for certain, but its theorized we do it so that it would be easier to track prey as they dodge in and out of shadows (prey reflect the blue sky while in the shadow, so they ...


-2

Electronics and the human mind are different things. As already mentioned, our eyes adjust the lighting/scene for us. Light, in physics, are wavelengths. In wavelengths are different frequencies. These different frequencies determine the colour. Below is a very simplified example of the relationship between colours and wavelengths: From: ...


1

Why do we 'correct' this by distorting the values according to the light source?] Because your visual system responds to relative changes in the intensities of different colors, whereas the camera sensor records absolute intensities. If you stand under a sodium streetlight for a while, you get used to that light being "white" even though it's quite a ...


1

The general answer to what you're wondering about is that there's a big difference between the simple photometric scene recorded by our eyes or a camera, and the results of filtering this raw data through human perception processes. One human perceptual phenomenon that might be closely related to what you're asking about may be this one, whereby even the ...


12

Yes. I just got back from a trip shooting at the Wildlife Refuges. I didn't remove the lens, and in fact, hadn't removed the lens for about the last 3,000 images. The last 300 images have a very distinct dust spot that appeared somewhere during the last day's shoot. Fortunately, in a place where I can crop it out without impacting the images. Dust on a ...


17

Several models of zoom lens are designed in such a way that they likely inhale dust and may vent it into the body of the camera. How big a problem this is remains debatable (see this discussion for example). Also, most lenses are not externally dust sealed so air and fine particles are likely to make their way in over time. For these reasons it probably ...


-2

Electronics get smaller and smaller. I am thinking that when it warms up the buss makes the proper connection due to shrink and expansion. The solder leads must have been manufactured cheep. But this is just a guessing game for me. Same thing has been happening with mac book pros when they warm up they are fine. The electronics warms up and it is ok. But ...



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