Cameras include HDW-730S, HDW-750P and the HDW-F900H

There are many different standards and formats to choose from when shooting High Definition.

The standard you choose depends on the end use of the material. In Europe there are currently no major broadcasters transmitting in High Definition, whereas in the USA and Japan High Definition TV is set to replace the existing NTSC system in the not too distant future.

Most of the major US networks already transmit a High Definition signal.

So why shoot in a High Definition format? Well it could be that you programme is for the US market or it could be that you want to convert you finished programme to film for cinema release just like the latest Star Wars film.

Another reason could be because you want to show your finished video on a big screen, maybe a large plasma screen or via a video projector.

When you compare the same image, one shot using a standard definition camera (SD) and one shot using a Hi Def (HD) camera on a large HD screen the SD picture often looks blurred and soft.

It's not until you see such a comparison that you realise how fuzzy SD video can look compared to the clarity of HD.

Progressive frames differ from the interlaced frames normally associated with TV and video.

With an interlaced frame the image is shown twice, the first time showing only the even numbered lines, the second with the odd numbered lines, the two images (fields) when combined (interlaced) make up one frame.

The interlace (i) system gives smoother action but images don't appear as sharp as you only ever see half the full resolution at any given moment.

With a progressive camera the full image (both even and odd lines) are displayed together.

This gives a sharper image but at 30p there can be some motion judder on fast camera moves or fast action, However this tends to give the image a very filmic look as it is much closer to the way a film image is projected.

One problem common to all the current HD cameras is focus checking.

On the small viewfinders fitted to the cameras it can be difficult to see when the image is in focus.

Often when viewed on a large HD monitor shots that appear to be in focus in the view finder are in fact slightly out.

For this reason it is almost essential to have access to a HD monitor.

Also the back focus of the lens should be checked as this is more critical on HD.

Sony HDW900 (also know as Panavision Cinealta) Sony and Panavision have a slightly re-worked and rebadged a version of the Sony HDCAM system called Cinealta.

The Cinealta system was used by George Lucas to shoot Star Wars Episode II.

By shooting on video Lucas was able to save a lot of time and money when it came to adding the films special effects, something that these days is almost always done using video or electronically scanned (digitised) film.

The Panavision versions of this camera can be used with standard Panavision film lens along with a whole range of film accesories.

These cameras can also shoot at a range of different frame rates including 60i, 50i, 30p, 25p and 24p.

The Sony HDCAM players are able to do a limited range of frame rate conversion making this format very flexible for those producing programmes for differing audiences.

High Definition is here to stay. In the US it is happening now. In Europe things are progressing more slowly (probably because the PAL Tv system looks pretty good anyway, at least until you've seen a High Definition picture.