Hot answers tagged

54

There are at least four reasons. Resolution First, although the same sensor may be used, video generally uses only a portion of it (either by skipping lines or some more sophisticated method). 4K UHD video is the equivalent of about 8 megapixels. Most DSLRs these have three or four times the pixel count, and many have even more. That means it's possible to ...


51

If it was launched at the Kennedy Space Center in Florida, there are ten of these Contraves-Goerz Kineto Tracking Mounts spread around the complex. Contraves-Goerz is now a part of the L-3 Brashear company. Multiple cameras are attached and all the cameras on each mount are precisely aimed on parallel optical axes. Other launch facilities use similar, if not ...


38

No, it won't work. The gray card works by reflecting ambient light (here "ambient" is used to include whatever flash, gels, etc. you're lighting your scene with other than the phone). You know it's supposed to be gray, so the difference between what you get and gray is the correction you need to make. By emitting pure gray light (assuming your phone can do ...


18

Yes, still cameras can do things 4k video can't. I imagine that future cameras will go in the direction of the Canon 1D C, which has still photography and 4k video in the same body. From a photography standpoint, the advantages of shooting stills instead of frame-captured video include: Higher resolution. 4k video is around 8 megapixels, compared to the 16-...


18

Definitely don't try to support the camera by its hotshoe. It's not designed for it. I don't think you should put anything at all on a hotshoe. Everything is so heavy and all the weight is pushing and pulling in all directions on that little joint. Even if your hotshoe is designed to do that, that's an insanely bad holder. Your camera is hanging off the ...


15

It really depends on what you want to do with the camera. After all, there are many great photos that have been taken with older cameras, both when they were the hot new model and when they were no longer on the cutting edge. As with all equipment recommendations it comes down to the question of what do the technical demands of the photos you want to take ...


13

If the result you are looking for is a photograph, the short answer is no. The same equipment won't give better results with video than it can with stills. I think the apparent difference is due to exactly one thing: resolution. Try taking one of your still frames, resampling down so it's 1080 pixels tall, and then comparing. There isn't any inherent low-...


12

Here is a methodology to find it: Prepare a white screen on you computer, for example a white document in GIMP. Take an out-of-focus photo, for example, focus at infinity and the widest aperture to avoid vignetting. Use different settings. Overexpose until the histogram is almost to the right. Underexpose until the histogram is almost to the left. Open the ...


11

4K video cameras will not be able to replace still cameras. First, 4K video resolution is only about 9 megapixels. Megapixels aren't everything, but in general more is good, and modern mid-grade to high-end still cameras clearly take advantage of more than that. Second, and more importantly, video cameras are optimized for video, and that has needs which ...


10

Older models like the 30D simply lack the hardware required to continually read from the image sensor. These models cannot support video, except at very low framerates by opening and closing the mechanical shutter continuously. Since the introduction of live view with the 1D mkIII in 2007, Canon DSLRs have been equipped with an electronic shutter and can ...


10

That effect was made famous in Hitchcock's Vertigo. It's called by various names: Hitchcock/Vertigo zoom, dolly zoom, reverse tracking shot. To achieve this effect, the camera zooms in or out, while the dolly (movable platform on rails) moves the camera towards or away from the subject to keep the subject the same size, while the background zooms in or out....


10

I would add two items to Matts answer equipment cost: nature photographers want to have a spare camera, and expect to break things when traveling in rough places. It adds up. lighting: not always an issue in nature photography, but it is easier to set up flash than continuous light. Having said that I expect 4K video to overcome stills as technique of ...


10

Taking sequences of periodic images, by their very nature of being periodic, is used to show changes in the scene over time. Time slice photographs. In particular, Dan Marker-Moore has created some truly beautiful time slice photos. From his site, A Time Slice is an image that combines series of photos taken from one location over an about of time. Each ...


9

Why do high resolution cameras shoot stills at high resolutions, but only typically shoot video at 1080p which is about 2 megapixels? For example I have a Sony-NEX 6 which can shoot stills at 16 megapixels but only 1080p by 1920p video. There are several reasons why most high resolution still cameras that also shoot video don't produce video at the ...


9

The next camera will certainly be better but each moment you wait is a missed opportunity for photography. Improvements are incremental from year to year. Last year's model are almost as good as this year's but they are much better than those 5 years ago. This is on average and there were some years where the performance did not improve or even reduces ...


8

I use ffmpeg for this task. It is a command line program that works well on Windows. A typical command line would look similar to ffmpeg -r 15 -start_number 1234 -i DSC_%d.jpg -s 1280x852 -vcodec libx264 output.mp4 This assumes that your files are named according to the pattern DSC_1234.jpg and that the first file is no. 1234. The framerate is set to ...


8

Data rates, data rates, data rates. A high resolution photo from a 24 megapixel sensor for example is 20 to 30MB in raw or 10MB in high quality jpeg. If you were to store that many frames for video, that would be 240MB to 720MB per second. No SD card can write that fast and the amount of information that would have to be processed by the image processing ...


8

The vertical lines are a type of noise called 'grid noise' or 'read noise'. It is noise caused by 'dark current' in the electronics of the sensor and the camera's electronics that amplifies the analog signal from the sensor before it is converted to digital information. It is caused by electrical current that is not created by a photon striking a sensel (...


8

The most probable cause is cheap LED lighting, maybe even using RGB LEDs. As with most shutterless cams, the image information is read from the sensor in lines. This causes two known effects: The Rolling shutter effect and banding. What you see here, seems to be banding. To dim LED lights, you have to pulse the light. Your eyes are slow enough not to ...


7

This isn't possible with DSLRs using optical viewfinders. This image (source) shows the cross-section of a DSLR: Normally light enters the lens, reflects off the mirror (#2) into the pentaprism (#8) and then to the optical viewfinder (#9). When the mirror is in this position, light does not reach the sensor. When recording a video, the sensor makes 60 ...


6

This really is an interesting and rather loaded question. For one thing, 4k video is HUGE compared to photos. Full quality 4K video that would really maintain quality at a per frame level takes around 250GB to 500GB per hour of video. Taking photos only require one particular frame to be captured and can capture at much higher quality. (4k UltraHD is ...


6

More generally, you'll find that most cameras which are primarily stills cameras will be limited to 30 minutes of video. This is due to EU regulations which mean that anything which can record longer than 30 minutes is a "video camera" and attracts a higher rate of duty. Panasonic are a notable exception to this in that they produce separate EU and non-EU ...


6

Does it film video? No. I used a Rebel XT/350D for a long time, and I can tell you that it does not record video. It was a great camera for learning, but it's about 11 years old at this point and has been far surpassed by its successors in the Rebel line. The first Canon Rebel model to officially support video was the Rebel T1i/500D, and every model since ...


6

What on earth makes you think you're not still composing, even if you're shooting 360º? You can make a sizable difference in the images you take simply by choosing a different vantage point. Both remapped from 360ºx180º panoramas of the same subject (the Spreckels Organ Pavilion in Balboa Park), taken from two different vantage points, first one's from the ...


6

TL;DR: yes, the video mode is cropped by approx. 1.28× (calculated by measurement). The effective video focal length is 36mm (in 35mm equivalent). I read (in a user comment) that the iPhone's focal length is longer when shooting video because the frame is cropped slightly to enable video stabilization. Is this true? It appears to be true that the video ...


6

In short, everything about color has a psychological meaning or response: https://www.ncbi.nlm.nih.gov/pubmed/28612080 Oversaturated images tend to grab our attention and there is both a trend for them and backlash as far as art is concerned (Why are vibrant, saturated photos considered 'not as good'?). But, Social Media is not art, it is all ...


5

This isn't possible on the 600D; you have to half-press the shutter to get autofocus. As you'll discover, this still isn't an ideal solution as you'll tend to get a lot of "focus hunting" as the contrast-detect autofocus looks for the best lock, and (if you're using the kit lenses) a lot of noise as the autofocus motor drives. I'd recommend trying to learn ...


5

I would say noise. As you increase the ISO you get more noise, and noisy images do not compress as well as clean ones. Noise increases the amount of information in the image, so that results in each frame being larger and taking up more bandwidth.


5

You could try using Registax. Generally, Registax is used for astrophotography, particularly of the planets in our solar system. Registax uses the concept of superresolution to stack hundreds or thousands of frames, discard the worst, keep the best, then interpolate the information from all of those frames in such a way that it enhances detail and resolution....


5

I know that you asked for a non-command-line solution, but I think that this one is simple enough to post. Moreover, I noticed the "no CLI" only after I wrote it, so... maybe could be useful for someone else. There is an example doing exactly that (although for a different objective --- long exposure without ND filters) that I think it is what you need in ...


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