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Digital cameras see black scrolling lines when filming light from my desk lamp

Cheap (to make) LED lights will flicker at twice the mains frequency. There are many ways of overcoming this in the design of lights, such as using a larger smoothing capacitor (which makes the light ...
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9 votes

Digital cameras see black scrolling lines when filming light from my desk lamp

The reason is very simple. LED's are not constantly turned on, but flicker at a very high rate, usually due to fluctuations in your powerline. Your video camera records at a fixed framerate and as ...
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  • 191
7 votes
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What gives a local TV news show that "look"?

The answer is both "light: lots and lots of light" and the imaging system. But it is not f22 (which on most cameras would produce a surprisingly soft result due to diffraction limits). The "light: ...
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7 votes
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SDI - serial digital interface

General SDI vs. HDMI Information SDI is easier to connect to other professional equipment than HDMI. It is an all purpose signal, as opposed to HDMI that was originally intended only to connect to ...
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6 votes
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What is the cheapest camera I can plug external microphone to?

Do you own a high-end smartphone? You can plug-in pretty much any microphone and have very decent audio quality. Some Android phones even support usb mics. So you probably need a cheap adapter for ...
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  • 7,099
6 votes

Does 4K impact quality when filming in low light? (other parameters being equal)

There are three key factors in your cameras low light performace: 1. Lens (Aperture) The lower your f-stop, the more light gets through to the sensor, you will also have a very shallow (narrow) Depth ...
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5 votes

Does 4K impact quality when filming in low light? (other parameters being equal)

Yes, if you record a video in 4K, then downsize to 1080p, the image will look much clearer than if you shot the video on a 1080p camera. You can also zoom in up to 200% and still retain the quality in ...
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4 votes

About film making techniques

Remember its all about the story. How to tell the story. And the tools you use to tell it. Editing, lighting, special effects and sound (are the tools used to tell your story.) Remember: story, ...
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  • 1,079
4 votes

What is the cheapest camera I can plug external microphone to?

The Canon VIXIA HF R500 is the least expensive consumer camcorder (from a major brand) that I have been able to find. I own one and love it. It has an external microphone jack that is compatible with ...
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  • 259
4 votes

Does the new Panasonic 4k LUMIX LX100 seem like a good entry-level 4k camera?

When I was first looking for a good portable camera, the LX100 was on the top of the list. When looking at research, the LX100 provides great IQ (at 4k) in a good compact device for the price. If you ...
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4 votes
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After Effects: Parent a Camera's position to a Null-Object with specific Off-Set

To drive an animation by another layer use the pick whip or the selection list to parent it. In the following example the Camera (layer) adopts all animation properties of the Null. Note: Camera is a ...
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  • 2,269
4 votes

Recording video's with two cameras?

I've had my fair share of matching. C100 with 5D MK III, 5D MK III with 7D, 7D with C100, 7D with a Sony Camcorder. It's all a matter of getting two cameras that are similar in terms of resolution ...
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  • 799
4 votes

Why do cinema cameras cost too much?

Look at it from a data rate point of view: a GH4 records 4K at 100 Mbps. A RED Carbon Fiber WEAPON records at 300MBps. That's 24x the data rate. Look at how very much more expensive it is to ...
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4 votes
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Why use different camera angles?

Different angles are used for many reasons. Wide and/or long shots are used to establish the setting where the video is being shot. Medium shots are used to show the relationship between people and/...
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4 votes

What is causing these horizontal lines moving vertically up the whiter portions of the video?

You seem to have a flickering light source that is out of sync with the camera's rolling shutter. Traditional lights You should first verify that you are filming in 60/30/24 fps in regions whose power ...
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  • 773
4 votes

What are Grey Balls used for?

Yes, they are used for adding visual effects in post. The mirrored ball is for creating an environment map or reflection map. These maps provide the same lighting from the real scene to the virtual ...
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  • 2,146
4 votes

Digital cameras see black scrolling lines when filming light from my desk lamp

LEDs are a very fast reacting light source, far faster reacting than incandescents or even flouresecents. So if the current through the LED varies rapidly the light output will vary equally rapidly. ...
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4 votes
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Camera flash produces unwanted artifacts on the video

This is actually a collateral effect of the concept of rolling shutter. Most video devices do not expose all the frame area at once. They expose starting from one side and (up or down) and move from ...
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  • 1,055
4 votes

What is the minimum camera requirements to create professional quality videos?

The camera only plays a part in what makes a good, clean image. The most important parts are Lighting, Lenses and Knowledge of the person operating the camera. If you film in a dark location and have ...
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3 votes

Making the camera travel through a hole in a letter

Here's one idea for the effect, which you can even do in Premiere: Get a live-action camera shot where the camera is slowly trucking forward. In post-production, create a title that has at least one ...
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  • 1,589
3 votes
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What is good software for camera recording under Linux?

I was going to recommend Kino which is the one I used when I needed to do that, but according to their web page the project is no longer mantained, so you can either use it the way it is or try the ...
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  • 297
3 votes
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Making lenses (water and dust) splashproof?

It depends on what you mean by splashproof. Rain covers are the absolute cheapest form of protection (as little as $5 or as much as $70+), though they generally leave the front element exposed and ...
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  • 19.2k
3 votes
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Thousands of frames per second?

The Casio EX-F1 can shoot upto 1200fps, but the resolution reduces as the frame rate gets higher. They go on eBay for about £600. http://www.casio.com/products/archive/Digital_Cameras/High-Speed/EX-...
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  • 6,408
3 votes

What's the best way to video chess/go/baduk/weiqi board from above (i.e. top down view)?

(This is an alternative to mounting a camera above a game board.) If it proves difficult to mount and operate a camera above the board, consider using a mirror as an alternative. The camera can be ...
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  • 1,589
3 votes

Do Film Makers Want 4k?

In my opinion, the market for 4k delivery is still very small, but that doesn't mean its useless. Shooting at a higher resolution than the delivery resolution allows you to recompose shots without ...
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3 votes

What gives a local TV news show that "look"?

Mostly it's in the light: lots and lots of light. This allows the camera's iris to be as closed as possible, giving maximum depth of field. An image taken at f2 is going to have a tight focal plane, ...
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  • 4,654
3 votes

Why do cinema cameras cost too much?

You are probably comparing cameras that record compressed 4k video with cameras that record uncompressed video, i.e. RAW footage. The ARRI ALEXA and RED Epic belong in the latter category. The ...
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  • 5,382
3 votes

Why do cinema cameras cost too much?

The image processing of cinema cameras is done with fairly inexpensive FPGA chips, that doesn't explain a 50.000€ price difference between I.e. a gh4 and a arri Alexa. The FPGA chip used in blackmagic ...
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3 votes
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How to get the Cinematic look

There are a few important things to consider: Lighting is perhaps the most important aspect to creating a filmic image. A lot of filmmakers like to use natural light such as Innaritu on The Revenant. ...
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  • 799

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