Spring 2012

Spring 2012
by ani

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28

The key here is how much light will be hitting sensor during flash, and how much during the rest of exposure. The sensor does gather light during the whole exposure; all of it is blended into one static image. In case the ambient light is much lower, it won't have nearly as much effect on the total light that reaches the sensor, and therefore only surfaces ...


19

I just read that a normal flash illuminates a scene within a 1/250th of a second. (A flash would keep the scene illuminated for a 1/250th of a second, right? In general, that's wrong. Flash duration is flash duration and sync speed is sync speed. Apples and oranges. The 1/250th of a second is the sync speed of (many) cameras. That's basically the ...


14

If the camera is on a tripod, and we assume little or no camera movement, then there are two possibilities. Most likely, at 3", your brother is not going to stay perfectly still and there will be some subject movement. You could fix that in part by using flash during the exposure to freeze the foreground subject. And also, it's presumably fairly dark, ...


9

The issue that you are having is that your brother may appear to be still for the 3 seconds of your shutter speed but even breathing can impact the photo from being sharp. He is still moving even though it doesn't look like it. A solution I found with doing a photo like this is to have a flash set to second curtain and hit him with the flash; it should put ...


9

If you take a photo at 1/10 second without flash and the image is black, you have effectively "killed the ambient" with your shutter speed, the shutter duration is too fast (with your other settings) to allow enough light to hit your sensor to make an image. When you add flash, the flash duration is very, VERY fast, 1/1000 of a second or faster (depending ...


9

Simple: the flash duration is very short. A full-powered flash is usually around ¹⁄₂₀₀th of a second, and if less than full power is used, it can be in the ¹⁄₁₀₀₀₀th range. If this flash is the only significant contributor of light in the image (and indoors, it's easy for that to be the case), the rest of the time the shutter is open just doesn't matter. ...


6

I just read that a normal flash illuminates a scene within a 1/250th of a second. (A flash would keep the scene illuminated for a 1/250th of a second, right? Sort of, depending on the specifics of the flash unit and the power setting. For example, a Canon 580EX Speedlite set to full power discharges over 1/250s according to Andy Gock's Actual Measured ...


6

You're right, there are situations when flash won't freeze the action. It all depends on the relative levels of the ambient and flash illumination. If the majority of the light is coming from the ambient lighting, you'll still see motion blur with a slow shutter speed, because most of the light in the scene will NOT be coming from the flash. However, if ...


5

A polarizing filter will probably cut out 2 stops of light, which would allow you to shoot at 1/200 instead of 1/800. Depending on your lens, you might be able to shoot at f/11 or f/16 and further reduce the shutter speed. You should get good prop blur at 1/125 or so. The problem with a CPL is that as you pan across the sky, or rotate the camera from ...


3

Your premise is wrong, because actually both your subjects are blurry: the cars and your brother. The difference is for which it is desireable. To make only your brother in the foreground appear sharp, use a flash. Use second curtain sync to override the blurry long exposure of your brother with the light of the flash at the end of the exposure. To limit ...


3

There are some software packages which do this. Vladimir Yuzhikov's SmartDeblur and the much more complete ImageMagick come in mind as first free solutions but most probably there are other ones. The most common approach is the one which is the deconvolution based on the Wiener filter If you want to read more, there are also other methods for achieving ...


3

I used to live in a large city suburb and over time found some very interesting subjects to practice panning. I appreciate that these subjects are not high speed planes, but with the challenges of a suburban area, may provide some benefit and improvement for your next visit to an airshow or motoring event. Skateboarders, Roller skaters and Roller bladers ...


2

Mmmm... not really. Best I could do with Photoshop CC 2014's Filter > Sharpen > Shake Reduction.


2

Yes, to some extent. See also: Can anyone recommend *freeware* to reduce motion blur by deconvolution?


2

Unfortunately, no. Once taken, a blurred picture is composed by individual pixels disposed in a way that give this distortion effect. Some software algorithms are capable of reducing this effect when it is mild. They rely on a sort of automatic boundary recognition. Simplifying, when they see a difference in colors, they assume it is the edge of an object, ...


2

Panning isn't so much about how fast, in terms of feet-per-second or miles-per-hour, your subject is moving. It is more about how many angular degrees per second your subject moves relative to the axis of rotation of your camera. A car moving at 20-30 mph will move the same angular distance per second as a plane moving at 200-300 mph if it is 1/10 as far ...


2

This effect is a simple motion blur. You recreate it with using a slow shutter, low ISO, low light and a steady hand or a tripod. The person just moves the body part. Try this simulator out. On the running dog image, check "Link" then move the shutter slide to the left. Longer exposure makes moving objects blurred. To recreate this on your smartphone, you ...


2

Motion blur? How to reproduce that? On a retouching software you go to... Effects > Motion blur... Normally you need to work in a specific layer. If you are refering to a photo you simply use a slow shutter speed. How low? depends on how fast the object is moving, how close you are to that subject so what is the relative distance you need on the framing ...


2

The question seems to make an incorrect assumption: that at a sync speed of 1/250 second the entire sensor is uncovered at the same time for 1/250 second. This is not the case. Most of that time is consumed by the first curtain opening and the second curtain closing. There is only a short instant between the transit of the two curtains when the entire sensor ...


2

Your brother will be moving during the exposure no matter how hard he tries not to. You need to use flash to illuminate him separately - doesn't have to be rear curtain sync, front will work just as well, just not an automatic exposure that'll force it to 1/60s. That will create two exposures in the same frame - flash power, aperture and ISO for your brother,...


1

I think the effect is caused at least in part by the many small branches that you don't see in the image. As you're moving along in the car, the dark twigs and small branches moved across the frame at various rates depending on their distance from the camera. Some points on the sensor happened to image various branches and twigs throughout all or most of the ...


1

1/250 is the time that it typically takes for a mechanical shutter curtain to travel from one end position to another. So for any faster shutter speeds, the closing curtain has to start moving before opening curtain has finished its travel, and 1/250 is the fastest shutter speed where, for just a moment, the whole sensor (or film frame) is exposed at once. ...


1

Your understanding of how a flash works is wrong. The flash duration is more in the range of 1/1000 to 1/8000. Due to physics and the design,the shutter needs to be open longer 1/1000 in order for the flash to "Sync". Flash photography usually involves both ambient light, and light from the flash. Usually we like to use faster shutter speeds to avoid ...


1

This question can be deterministically answered with a small amount of mathematical calculation. Every sensor has a finite number of horizontal and vertical pixels. Therefore, at any specific focal length, we can determine the effective distance between pixels. The exposure time must be short enough that the moving object does not have sufficient time to ...



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