David Vincent Clarke Ltd., Unit E7, Knoll Business Centre, Hove, Sussex, BN3 7GS. Tel: 01273 205700, Email: email@example.com
Stereoscopic (the proper word for 3D video) filming is becoming more and more affordable. Panasonic has had a domestic Stereo camera, costing around £700, for about a year, and Sony has a new STEREO camera which films in FULL quality (the Panasonic only filmed in half quality) for around £1,000.
Panasonic have the cheapest professional camera, the AG-3DA1 at £16,000.
What are the major considerations for STEREOSCOPIC filming and editing?
To film a STEREOSCOPIC image you just need to film two pictures which correspond to you left and right eye. This can simply be two cameras on a rig. The problem with a camera rig is getting the cameras the right distance apart, making sure they are exactly the same camera (different lenses and chips can cause really strange results) and making sure the Focus and zoom etc is EXACTLY the same. It is far easier to buy a camera that will film in 3D in the first place.
What STEREO cameras are available?
There are quite a few - in the "reasonable" price range there are a couple from Panasonic and 1 from Sony. How the footage is edited does depend greatly on how it was filmed.
Panasonic HDC-SDT750 camera
The first really cheap 3D camera, the 750 is a variation on the mono Panasonic 700 camera. Pictured here with the 3D lens attached, which can be removed and effectively change the camera into the standard, non-stereo Panasonic 700. This camera does not film full resolution STEREO images but instead films in SIDE-BY-SIDE - the left eye picture is squeezed into one side of the image and the right eye picture squeezed into the other. With the picture being 1920x1080 pixels in total this means you have a STEREO image which is actually 960x1080 - so about half of full HD resolution. This image is very easy to edit and every editing program will let you edit it, and then write it on to a DVD/Blu-ray disc, because it is really just a normal HD picture with the different eye views squeezed into either side. To see this picture on a 3D TV you need to select the SIDE-BY-SIDE mode on the TV.
This camera is approximately £900
A new camera from Sony which film full HD STEREO images. The two images are stored in a single file as separate streams, along with the 5.1 audio. This camera is about £1,000 so making it by far the cheapest camera that can film FULL HD STEREO images. The camera also has a 3D LCD screen that works without glasses, which does look pretty amazing. The drawback of the screen is that you cannot get too close or the 3D effect does not work, and if you are looking at slightly the wrong angle then you see a double image rather than a 3D on. Apart from recording full HD STEREO images this camera has other advantages over the Panasonic 750 - you can zoom the picture in 3D mode and you also have control over the convergence of the image when filming so you can change how close, or far away an object is. The major problem with this camera is how to edit the footage - currently the ONLY program that we have that understands this footage is Sony Vegas Pro 10/11. If we take the 3D file into any other editing program or even use CineForm, then you only see the results from one eye. This means that you can film in STEREO but it is very easy to produce a standard, mono, DVD/Blu-ray in any program which can accept AVCHD files, however, it does create more of a problem for editing. We expect this to change over time, since, at the time of writing this article at the end of October 2011, the camera is actually very new so many programs have not yet had the chance to support it.
At DVC as soon as we heard about this camera we went out and bought one for our own use!
Panasonic AG-3DA1 Full HD camera
This was the first reasonably priced camera (at approximately £16,000 street price not cheap camera but still cheaper than the professional cameras) that could record full HD images. Obviously it is a lot more expensive than the Sony TD10 mentioned above so what are the main differences?
You can read the full specifications of this camera here: http://www.resource.holdan.eu/specs/Panasonic_AG-3DA1.pdf
DIFFERENT WAYS OF VIEWING 3D
Once you have the two pictures (left eye and right eye) you need some way to watch them. There are various methods:
WHAT TYPE OF SCREEN DO YOU NEED?
Anaglyph can be viewed on ANY screen - which is why it was the first way of making 3D movies and also the method adapted by YouTube. For the other formats you need a 3D screen and glasses which match. The glasses are either ACTIVE or PASSIVE. ACTIVE glasses are more expensive (although the TVs are cheaper) and the glasses have to be powered. The glasses sync with the screen so that the lenses open and close on each eye at at the right time to match the TV playback, making sure you get the correct image to the right eye and left eye.
Passive glasses are cheaper and do not require power (the glasses used at the cinema are passive glasses).
Some screens only work on computers and some are full-blown TVs. Our Sandybridge laptop can have a 3D screen instead of the standard 2D one for a small extra cost.
WHAT ABOUT EDITING THE FOOTAGE?
If using SIDE-BY-SIDE you can edit with nearly ANY editing program using the method described above. However it is hassle and you have to apply effects to every single clip. A better option is to either use a program like Sony Vegas with STEREOSCOPIC editing built-in or add a plug-in like CineForm Neo 3D. With these you take the clips produced (a file for the left eye and a file for the right eye) and combine them into a new file. The software then lets you choose how you display the 3D - anaglyph, SIDE-BY-SIDE etc.. just by changing a simple setting. You also get control over the CONVERGENCE and have access to all the other effects and filters in your program.
WHAT IS CONVERGENCE?
In addition to worrying about the focus. zoom etc you also need to worry about what part of your image represents the position of the TV on which the footage is watched. This is called the convergence. with proper 3D software you can control this and decide where the sections of your image appear to the viewer. You can also use it to do things like make titles and other added effects to move around in 3D space. Convergence is very important because it yuo get it wring your audio will end up feeling ill! Most cameras will let you adjust it as you film, although you really also want control of this in post production. Vegas, Avid and CineForm all give you this control.