DVL-Digest 561 - Postings: Index AC outlets Intro websites (was: Introduct Preview Monitors Time runs short... timecode transfer from BigiBet AC outlets - "Perry" Further on this topic: I did a job last week involving my portable (12volt) pro mixer feeding my VX-1000. Although not strictly Kosher, I go balanced to unbalanced with the audio lead, with the ground unconnected. The first day I had both camera and mixer powered by their respective mains PSU bricks, and I got bad audio hum even though both were fed from the same mains power socket (so no ground loops involved). The next day with an identical connection in the same location, I didn't get any hum! Very strange! Actually none of this is news to me, I've often got hum when feeding the camera with external sources, but I've never had such a blatant >here today - gone tomorrow< scenario. There are usually workarounds like running the camera on batteries, but it would be nice to understand the mechanism causing the problem in the first place. Perry Mitchell Video Facilities http://www.perrybits.co.uk/ Intro websites (was: Introduct - Adam Wilt I am looking for any web sites with tutorials, explanations, or > evaluations of cameras, and software. Plenty of links, including links to other pages of links: http://www.adamwilt.com/DV.html#Links [disclaimer: I'm biased, grin] Cheers, Adam Wilt a DV FAQ: http://www.adamwilt.com/DV.html Preview Monitors - Adam Wilt But what I still don't understand is, wouldn't a computer monitor be best > for analyzing color, detail, sharpness, etc? Only if your target display is a computer monitor. If you're aiming for TV display, you need to use a video monitor. Computer monitors and TVs / video monitors differ in several important areas [note: I'll talk about "PCs" vs. "TVs" as a convenient shorthand]: - colorimetry: colors look very different on PCs and TVs, both in terms of white point (red vs. blue. tones) and color gamut (the range of colors available in the phosphors). - phosphor persistence and spot shape: the way the image is "written" onscreen is optimised differently on PCs and TVs. - interlaced vs. progressive scan: almost all PCs nowadays use a progressively scanned image, usually at a higher-than-TV frame rate, and almost always at a higher resolution. In short, TVs have developed over 50+ years to optimise pleasing, large screen display of interlaced, comparatively low resolution, dynamic images. Computer displays have developed over a somewhat shorter time to optimise presentation of high-contrast, high-resolution, finely detailed, mostly static imagery. As a result, they show images very differently. Thus, for better results, use a high-quality video monitor to see the platonic ideal of what your target audience will see (somewhat less ideally) on TVs that at their best approach the quality and rendering of your video monitor. For best results, use a waveform monitor and vectorscope to *know* exactly what the image is doing. You can also measure picture information on the computer by using computer-based tools, but for *viewing* the image *as it will be seen by your audience* use a video monitor. Cheers, Adam Wilt a DV FAQ: http://www.adamwilt.com/DV.html Time runs short... - Adam Wilt ...too much to do, so I'm dropping off the list for now. Hope to be back on in three weeks or so, but if not, see some of you at IBC, some at DV Expo. Cheers, Adam Wilt a DV FAQ: http://www.adamwilt.com/DV.html timecode transfer from BigiBet - "Perry" Jan de Wever posted: >You don't need a genlocked camera to get TC out of it! Take the idea of 2 camera's running the same TC (both in 'free run' and locked by connecting a BNC cable between their TC connections, removing it, and they will run the same TC for ever!).< Sorry Jan, this just isn't right! Legal TC is by definition locked to video. Two free running (i.e. not genlocked) cameras could drift apart by several frames in an hour, let alone 'for ever'. To guarantee that two cameras have identical TC, you have to genlock the video together. Of course in practice, the drift may be smaller and could well be non significant. Perry Mitchell Video Facilities http://www.perrybits.co.uk/ (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
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