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There is no measurement for shutter lag, unfortunately, on digital cameras.

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โˆ™ 2009-10-06 23:22:48
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Q: Is there a measurement for shutter lag on digital cameras?
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What is difference between lag compensator and lead compensator?

The difference between a lag compensator and lead compensator is that the lead compensator modify the transient response of the system while the lag compensator modifies the steady state.A Compensator Gc is of the form K*A(S+1/T)/(S+1/(AT))the S=-1/T is the additional zero and S= -1/(AT) is the additional pole. For a lead compensator, A is between 0 and 1 while for the lag compensator A is bigger than 1 which allows of an appreciable change in gain, hence a change in steady state response.A lead-lag compensator is a component in a control system that improves an undesirable frequency response in a feedback and control system. It is a fundamental building block in classicalcontrol theory. Contents [hide]1 Applications2 Theory3 Implementation4 Intuitive explanation5 References6 See also7 External linksApplicationsLead-lag compensators influence disciplines as varied as robotics, satellite control, automobile diagnostics, laser frequency stabilization, and many more. They are an important building block in analog control systems, and can also be used in digital control. Given the control plant, desired specifications can be achieved using compensators. I, D, PI, PD, and PID, are optimizing controllers which are used to improve system parameters (such as reducing steady state error, reducing resonant peak, improving system response by reducing rise time). All these operations can be done by compensators as well. TheoryBoth lead compensators and lag compensators introduce a pole-zero pair into the open loop transfer function. The transfer function can be written in the Laplace domain aswhere X is the input to the compensator, Y is the output, s is the complex Laplace transform variable, z is the zero frequency and p is the pole frequency. The pole and zero are both typically negative. In a lead compensator, the pole is left of the zero in the complex plane, , while in a lag compensator .A lead-lag compensator consists of a lead compensator cascaded with a lag compensator. The overall transfer function can be written asTypically , where z1 and p1 are the zero and pole of the lead compensator and z2 and p2 are the zero and pole of the lag compensator. The lead compensator provides phase lead at high frequencies. This shifts the poles to the left, which enhances the responsiveness and stability of the system. The lag compensator provides phase lag at low frequencies which reduces the steady state error.The precise locations of the poles and zeros depend on both the desired characteristics of the closed loop response and the characteristics of the system being controlled. However, the pole and zero of the lag compensator should be close together so as not to cause the poles to shift right, which could cause instability or slow convergence. Since their purpose is to affect the low frequency behaviour, they should be near the origin.


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Related questions

What does it mean to have shutter lag?

Shutter lag is the time from when the shutter is triggered (pushing the shutter button) until the time the image is recorded. In professional cameras the shutter lag is far less than consumer cameras. Some professional cameras will take 6 to 8 frames per second when triggered by hand. Consumer cameras vary from about a tenth of a second to 2 seconds of shutter lag.


What are disadvantages of using a digital camera?

Shutter lag is the most commonly cited problem with digital cameras, because of the time it takes for auto focusing and the activation of the picture capture mechanism, often in situations where timing is important like sports events, the time between pressing the shutter button and the actual time the camera records the image can mean the difference between getting or losing the shot.


What causes shutter lag?

In a mechanical shutter it is the time that it takes for the mechanical components to mesh and begin the movement of the shutter blades. These components must also build up the forces necessary to move against the springs that hold the blades in the closed position. This build up of forces takes some finite amount of time to overcome, hence a lag time. Then, depending on mass of the shutter blades there is a finite time it takes for the blades to move to the open position. This is due to inertia. (Inertia is the property of matter by which it retains its state of rest or its velocity along a straight line so long as it is not acted upon by an external force.) In an electro-mechanical shutter additional lag times are provided by the inductance of the actuating mechanisms, (usually some electro-magnetic actuator). In these cases the time it takes for the actuator to build up the energy necessary to be able to overcome the "at rest" forces causes additional lag. Shutter lag is a property that shutter manufacturers work very hard to reduce to a minimum required duration. ****************** While technically correct, shutter lag in a modern non-digital SLR is virtually undetectable. The questioner was probably referring to the lag time of a non-SLR digital camera, which as most people have observed, can be a pain in the butt. The answer in that respect is that the lag is due to the time it takes the image to be converted to digital information. High priced digital SLRs have much less lag as their processing time is much shorter. The trade-off is the dent it puts in your wallet. Micron.


What are disadvantages of using a camera?

Shutter lag is the most commonly cited problem with digital cameras, because of the time it takes for auto focusing and the activation of the picture capture mechanism, often in situations where timing is important like sports events, the time between pressing the shutter button and the actual time the camera records the image can mean the difference between getting or losing the shot.


Can I use the mytouch 4G slide instead of bringing my digital camera everywhere?

This would be a great choice. Most phones do have great video and cameras, but the Mytouch is incredible. Zero shutter lag, clear Shot HDR.. you'll love it! Yes, you can post direct to social media like Facebook.


Is there a digital camera that will take pictures the precise or near enough moment you press the button?

I believe you are referring to Shutter Lag. It's the amount of time you wait between pressing the button and the camera actually taking the photo.Generally speaking, more expensive cameras have smaller Shutter Lag times. DSLRs are almost instant, but even they have a little lag time.In small point-and-shoot cameras, Sony tends to be a little quicker than most.Important Tip:Automatic cameras do several steps before they actual take the shot. They 1) focus, 2) calculate the exposure, and 3) take the shot.If you press the button down half way and hold it there, the camera will complete steps 1 and 2 and wait for you to press the button all the way down to do step 3.Pre-focusing before your shot, by holding the button down halfway, will reduce your shutter lag time.This means you have to think ahead and be ready for the shot before it happens. This is true for any camera, even the big DSLRs.


How do you make your digital camera faster?

If you mean, how can you reduce the shutter lag, you can speed things up by prefocusing (hold the button down halfway) before you have to take the picture. Read your manual.


How is your modern day camera better than the older camera?

well this depends on if your referring to Film Cameras as the old cameras or if your referring to older Digital Cameras the difference between Film and Digital cameras is that with Digital Cameras your able to have the image processed immediately after shooting and can have it viewed on an LCD Display meaning you waist less money waisting Film or having to buy Chemicals, another upper hand with using Digital is that you can fit more Photographs in a Memory Card compared to a 100ft roll of Bulk Film, maximum being only around 140 frames per 100ft compared to thousands on an 8GB SDHC Memory card on a 10MP Camera. The down side to Digital is that it can be much more confusing to use compared to a Film SLR Camera where with Film Cameras you have dials for controlling how the frame should be exposed as for Digital many cameras can take a while to prepare (White Balance, ISO, etc) and some Digital Cameras can have Lag time due to the time it takes for it to Focus (when on Auto Focus) another problem with Digital is that it requires a Battery/'s to work as for Film Cameras many run using Mechanical Shutter and not Electromagnetic (meaning it does not use any power source)


Why does it take a while after you press the button to take a picture before it is actually taken?

Less expensive digital cameras suffer from this lag, due to the time it takes to process the image and turn it into digital information. More expensive DSLR's are faster, and this lag time is often part of their published and promoted features. It is worth asking about when buying any digital camera.


Why does screen seem to shake while we see it through camera?

That happens for cameras with electronic viewfinders. What you see is an electronic projection of what the camera sees. This projection is not instantaneous. There is a slight lag. So when you move the camera even a bit, the projection lag makes the image look like it is shaking. For some cameras, this lag is very small, and you will have a hard time detecting the shake.


What are the disadvantages of digital photography?

For most "amateur" or "snapshot" photographers, there's virtually no disadvantage. For anything more serious, you start to see shortcomings, but there are shortcomings in a lot of things: 1. Lag time: the time it takes from when you press the shutter release until the shutter actually opens and closes to capture the image. In the good old days, if you pressed the shutter down all the way, you took the picture. With digital cameras there can be a delay, and that could cause you to miss the moment that you wanted to capture. 2. Enlargements: because the ability to enlarge is dependent to a fair extent on the resolution power of the camera, you need significantly higher resolution for super large prints or really tight crops. In the good old days of film, film "grain" was such that just about any film under 400 ASA (almost like ISO) you could get pictures sharp as tacks up to 2x3 feet with no problem, even if you had to do some cropping. In digital photography, you need upwards of 18 mp to assure a sharp print with no crop and even higher with any significant crops, and those cameras are 10x the cost of a film camera. Eventually the mps will go up and the cost will go down, but it's happening slower than one might like. 3. Delicacy: Especially with DSLRs that allow you to change lenses, sensors are susceptible to dust, and dust will affect your image (and require you to process any defects out). And we're talking a single speck of dust. Keeping a film camera clear of dust is less difficult or critical (although it can happen of course). 4. Electronics generally: there are non-digital cameras around that are 50 years old and are just as good as the day they were new, or can be adjusted to be darn close. Digital cameras have a "click life", meaning their components may have a significantly shorter usable life.


What digital camera has the fastest shutter speed?

To the best of my knowledge, it is the Olympus E3 at 1/8000 second as of 2008. However, an important measure of digital camera speed is also fps (frames per second) as the camera must meter and check focus and other settings before taking the shot. At present DSLRs can't be beat in this regard. Compact digitals usually suffer from shutter lag. Casio claims the fastest fps at 60 fps, 6.0MP, jpeg as of Aug. 2007. You should denote from this that the fps numbers alone mean nothing unless everyone is using the same yardstick. When have the manufacturers ever done that?

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