11
votes
Accepted
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 ...
- 234
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 ...
- 191
7
votes
Accepted
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: ...
- 4,730
7
votes
Accepted
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 ...
- 2,405
5
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 ...
- 2,156
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 ...
- 4,730
4
votes
Accepted
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/...
- 686
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 ...
- 803
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.
...
- 141
4
votes
Accepted
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 ...
- 1,152
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 ...
- 2,675
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, ...
- 4,674
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 ...
- 639
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 ...
- 5,412
3
votes
Accepted
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. ...
- 799
3
votes
Accepted
What are Grey Balls used for?
The grey balls are actually used like the grey cards but with added lighting data cause they are spherical and refer to the surrounding light sources better, they usually reflect 18% of the light and ...
- 146
3
votes
Accepted
How to record HDMI video with USB?
You already stated your options and you only have one that would work: you need a frame grabber.
A frame grabber is a specialized chipset that does a very specific task. Sometimes such devices are ...
- 2,164
3
votes
Accepted
How do I replace my organisation's event video camera?
Firstly, that camera has a 29 minute 59 second recording limit. If your speaker goes for longer than this it may not be suitable. Apparently this is due to some countries charging higher import duties ...
- 13.7k
3
votes
How does shutter speed affect the video?
A high shutter speed can make individual frames look more crisp but make large motion look like it is stuttering. e.g. fast panning looks like it is flickering or jumping
A low shutter speed can make ...
- 181
3
votes
Accepted
How does an optical viewfinder on a film camera work?
There are three ways that film cameras do this:
Using a rangefinder, i.e. a viewfinder that doesn't actually view
through the lens. Common on cheaper consumer format cameras such as
super-8
Using a ...
- 13.7k
3
votes
Accepted
How to realistically add planet in the sky using 3d camera tracker and avoid overlapping with objects in the foreground?
If the blades are rotating, and the camera is moving, you need to create a good foreground layer with anything the planet is supposed to be obscured by.
So from the image it looks like it will be ...
- 7,585
3
votes
Best hidden camera rig techniques
I've been on guerrilla shoots where they had a GoPro peeking through an O on a protest sign, held at head height like the protester isn't actually protesting right this minute.
Also, I've seen a ...
- 616
2
votes
What is good software for camera recording under Linux?
OBS (Open Broadcaster Software) is multi-platform (OBS is widely used in video game streaming). I haven't tried it yet myself for multiple cameras, but I know it supports at least one (as many ...
- 21
2
votes
What is the cheapest camera I can plug external microphone to?
If anyone is still looking for a similar setup that won't break the bank, I'd go with a laptop mounted cam - I have a Logitech HD Pro Webcam C920 which can be mounted on a tripod, too. The quality is ...
- 21
2
votes
Accepted
T5i video quality doesn't even match smartphone camera? Where can I improve?
Bottom line with the canon rebel series cameras is that the video is pulled from a low resolution capture of the chip which is normally used for high resolution photos. The photos from these cameras ...
- 411
2
votes
Reference Request: Camera Movements
Mic shot looks like a dolly back tilt to track the subject. This is a compound movement that is natural to do with a hand held camera but more challenging when using a digital camera. Try tracking ...
- 411
2
votes
Why do cinema cameras cost too much?
In addition to the points above, keep in mind that cinema cameras also have a host of features not found in cell phones and lower-end cameras, such as removable lenses, better autofocus, better bodies ...
- 2,156
2
votes
BMPCC + rafcamera arri b to mft + optar 1.2/12mm = vignetting
I'm not familiar with the setup you described, but does that adapter have some sort of iris control built into it? I have the adapter pictured below and it doesn't allow the BMPCC to adjust the ...
- 290
2
votes
Accepted
how can we shoot tv show so "tarak mehta ka ulta chasma" it will look like "house of card"?
I see four basic differences (in what I believe is the correct priority order):
Lighting. The lighting on Kevin Spacey is classic three-point lighting with warm fronts, a 2:1 key/fill ratio, and ...
- 4,730
Only top scored, non community-wiki answers of a minimum length are eligible