Hot answers tagged live-view
14
No, for a CMOS based dSLR, the shutter remains open during the video recording, so the shutter in use is actually electronic. B&H photo, by the way, have a pretty good article on some of the concepts. It's in reference to video recorders, but much, not all, of it applies to dSLRs as well.
Anyways, you do have an actuation for the act of flipping the ...
13
Page 44 in your manual!
The part you're probably looking for is (quoted from the manual):
Rotate the live view switch. The mirror will be raised and the view
through the lens
will be displayed in the camera monitor. The subject will no longer be visible in the
viewfinder.
The live view switch is located next to your mode dial and is ...
12
Major reason is that the DSLR lenses are optimized for Phase Detection. Every component of the lens is tailored towards quick movement and stopping the glass in precisely picked moment. Contrast detection on the other hand works best with stepper motors capable of quickly switching directions so that you can move lenses inside back and forth looking for ...
10
On a long exposure charge is allowed to accumulate on the sensor over a period of time, whereas in live view the sensor is discharged for every frame (so thirty times a second or so). Some hot pixels result from slow charge leakage which only occurs during a long exposure, hence you wouldn't expect to see these in live view.
Also liveview subsamples the ...
10
Yes, manual focusing is more accurate than phase detect AF (except for the combination of very recent Canon camera + lens). Over at LensRentals blog Roger performed AF tests back in July / August 2012. For almost any combination of camera and lens, manual focus can (given enough time) be better than phase detect AF. Read the whole blog series if you want to ...
9
It's the whole area in the square. Live view uses something called "contrast detection auto-focus", and that works by moving the lens back and forth until the sampled area exhibits the most contrast. Since blur is by definition low-contrast, this is very effective at finding the correct focus.
But, in order to work, it needs an area, first because there's ...
8
Video uses an electronic shutter, rather than the physical shutter used for photo taking, so each individual frame doesn't contribute to the actuation count in a DSLR.
However, the mirror and shutter must open at the beginning of live view mode, and close at the end, so technically there is one actuation per time you enter live view.
8
I would be willing to bet this is simply due to the camera changing modes back and forth between live view, actually exposing a photograph, and returning to live view.
In live view, it sounds like it stops the aperture down to where it should be.
When you take the shot, live view "exits", so the camera is set back to normal. That would reset the aperture ...
8
I suspect the major reason this is true for DSLRs is to get the lightning-fast focus times that point-and-shoot cameras don't have. The autofocus mechanism is not actually part of the CCD/CMOS, but a separate device in the camera body, and the mirror splits the light coming through your lens so that half goes to the viewfinder and half goes to the autofocus ...
7
Yes, and no.
Your camera will shut itself down or put itself in a "cool-down" mode in order to save the sensor from overheating. I've had my Canon T1i warn me, and then shut things down in order to cool off.
Could you develop hot pixels? Yes. (I would tend to the idea that any hot pixels are pixels that were prone to going hot anyway, and so you would have ...
7
As @cabbey suggests in the comments, different manufacturers handle aperture in Live View in different ways.
Most Nikon and Pentax cameras stop down the aperture to the setting selected before entering Live View, and keep it there until the shutter is pressed regardless of the setting being changed whilst in LV.
Most Canon and Sony cameras keep the ...
6
That is what a Camera Finder is for. There are 7 current DSLRs with a rotating display. Those do exactly what you ask for twisting away from the camera body rather than simply tilting up and down as some articulated displays do.
For a specific recommendation, the truth is that they are all good, particularly if you cannot tell the difference. Newer ones ...
6
To answer some of your questions directly, since you asked a few of them. First off, the mechanics of previewing a scene with the view finder vs. with live view are different. When viewing the scene through the view finder, you are seeing a direct optical projection of the scene as the lens attached to the camera sees it. Light is bent via a mirror from the ...
6
An image sensor is basically a small computer chip, and have similar heating characteristics. When transistor gates switch from on to off, or the other way you have small electrical currents in the chip. Everywhere on the chip there is a tiny amount of resistance, and when you have currents going through resistors the energy turn into heat.
During readout ...
6
I do not own a Nikon D5100 nor have I used one. From my research online, I believe that the Nikon D5100 does not in fact have a feature such as "Live View Exposure Simulation". This is what you are looking for.
Unfortunately, this feature is non existent in Nikon's current offerings. It is common for Canon to have this feature though - that is why you are ...
6
It actually depends on the camera that you have. You basically have two kinds of "Live Preview", the first using an automatic gain fonction to help you with the framing. It's the most basic one and for this, no matter what exposure setting you choose or modify, the screen will keep showing the same scene.
The second type of live preview is called Real time ...
5
The best answer I can provide is MILC article on Wikipedia. I'd add power consumption to the list of drawbacks - using an active viewfinder/LCD screen requires current delivered to the sensor and of course to the display.
5
I THINK it may be the secondary mirror stuck down -
Attached to the bottom of the main mirror, which is semi-silvered, is a secondary mirror pointing down.
If this is stuck down when the main mirror flips up, it will let light in from the viewfinder and possibly reflect light back in at the sensor.
set your camera to "lock mirror up for sensor cleaning" ...
5
Most Canon DSLRs can do it. On the EOS 60D this is called Quick Mode, despite it not being quick at all. You just have to select the option in the Camera menu. The other option is Live Mode which uses contrast-detection.
It is called the same on the 7D and I believe very similarly on the T?i models as well but I don't have them here to check at this time.
5
In Live View, the mirror is up and the AF collimators do not have view of the scene and can't do any focusing. The EOS Quick Mode flips the mirror down, exposing the scene to the collimators and then flips the mirror back up. There isn't a way for a traditional mirror-equipped DSLR to show live view WHILE using the collimators to focus.
The Sony Alpha DSLRs ...
5
I think I may have your answer. On the D300 and D700, if you are using lenses that have an aperture ring LV is disabled unless a certain menu setting (f7 on a D300, f9 on a D700) is set the correct way ("Sub-command dial OK").
Your 300mm has an aperture ring; your 24-85mm does not.
See:
...
5
Why does the LCD show only black in Live View in manual mode on T3i, until I half-press the shutter?
The Live View screen will by default try to 'mimic' the exposure you're likely to get with the settings you have dialled in. So in dim light with ISO 100, a fast shutter speed, and a small aperture, you will likely just see a black screen. When you half press the shutter the camera brightens it up while it meters the scene and so you can see what you're ...
4
On a DSLR the mirror is up when the camera is in live view, blocking off the AF sensors which are located away from the lens-sensor axis. AF in live view is usually handled with contrast detection, which is much more processor intensive. Compacts are designed to focus when in live view mode, so their mechanism is optimised for that particular setup, which is ...
4
My guess is that light is leaking in through the viewfinder. When you put the camera to your eye, it's blocked, but in live view, it's not, so some light leaks in. This wouldn't normally be so apparent (particularly not in a relatively short exposure like this, ¹⁄₈₀th of a second), I wouldn't think, so something else must be going on too, but I'd start by ...
4
You have just invented the mirrorless inter-changable lens camera. SLRs were needed because back then, in the 60s and early 70s, there were no electronic viewfinders. Things like the Nikon F were amazing and advanced.
Some people prefer the pentaprism viewfinder, but that is just a personal choice. With a good electronic viewfinder, cameras can be lighter, ...
4
This is an expensive hobby. I think we generally consider < $1000 to be consumer level. Margins are actually pretty cutthroat in this segment of the market, and it's expensive to make a strong and reliable articulating screen, which is why you're not seeing it on the lowest-level DSLRs even though it's a very consumer-friendly feature.
That said, you can ...
4
You could try digiCamControl. One of its advanced features is Live View via computer display. However, the D3100 may not support that feature.
The Nikon SDK allows you to capture Live View images as JPGs. So a program could be written to loop, capture and display those JPGS. Someone has written a C# wrapper for the SDK which gives an example of this ...
4
D3100 cannot support the feature that you want to implement, but the new Nikon D3200 has change the image of the D3xxx series. with the help of WU-1a Wireless Mobile Adapter, you can connect it to the DSLR, to automatically send your images to your Smart phone and even use your smartphone to remotely capture images from D3200 and D5200. I'm not sure if it ...
4
Short answer: the difference is in an SLR the mirror flips up to take a photo, whereas the SLT employs a semi-transparent mirror so that the mirror never has to move.
Now to your questions:
1) How does a DSLR do continuous focusing (AI servo/AFC)? Does it literally flip the mirror up, take the shot, put the mirror down, refocuses and repeat?
That's ...
3
It would depend on the specific camera, but in many cameras Live View will show 100% coverage (the final image will be the same as what you see in the LCD) where the viewfinder may only be 95% (true on certain Nikon models at least).
Live View uses a different autofocus mechanism, which seems slower to me, but is said to be more accurate. It is often used ...
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