Help Super8 filming off an LCD panel please

Post by **john jay** » Sun May 16, 2004 9:27 pm

Ive been informed that filming Super8 off an LCD panel is good at 1080 x 768 - you dont see the pixel dots

my question is about exposure and film rate

should I exposure for the brightest scene and then keep the exposure fixed for the whole thing
OR
leave it on auto and let the film cam decide?

Is it safer to over or under expose?

Is it better to film at real-time OR one frame at a time stop animation to avoid any sync problems - the source is 24 fps AVI

thanks for your help

Post by **MovieStuff** » Sun May 16, 2004 9:42 pm

It would be best if you did it one frame at a time to avoid frame blending and maintain a more film-like end results. Also, if using K40, you may find that filming at full speed is impossible due to the low light level of a typical LCD display. If your camera will do longer exposures during single frame capture, that would be ideal since it would solve the exposure problem as well as synch. Short of that, if your camera will run at, say, 6fps, then you could simply slow down your timeline to about 25% running speed (assuming final playback is 24fps). You'll get frame blending but your exposure should be okay and the process would automatic. In fact, at that frame rate, you could capture off of a CRT and avoid any scan lines.

Roger

Post by **john jay** » Sun May 16, 2004 9:49 pm

Thx Roger

It seems that stop frame is the way to go and safer!

what about exposure - should I keep that fixed based on the brightest scene?

Post by **MovieStuff** » Sun May 16, 2004 11:09 pm

john jay wrote:Thx Roger

It seems that stop frame is the way to go and safer!

what about exposure - should I keep that fixed based on the brightest scene?

Well, ideally you'd like to do some wedge tests to see what works best for each given cut. I wouldn't put the camera on auto, that's for sure. A test is really needed to get the best results.

Roger

Post by **mattias** » Sun May 16, 2004 11:15 pm

john jay wrote:should I keep that fixed based on the brightest scene?

i'm not sure i understand the question. why do you have scenes with different brightness? if they are supposed to be different they should be exposed the same way to mantain the difference, or else you should time them to match and still expose all the same...

/matt

Post by **john jay** » Mon May 17, 2004 12:59 am

yes thats right

keep constant exposure

I sure wish this process could be automated:)

Post by **sunrise** » Tue May 25, 2004 1:32 pm

Logo filmed of a laptop monitor on Ektachrome at 3fps AE:

sunrise

Post by **Astro** » Tue May 25, 2004 2:41 pm

I've used 7218 500T at 25fps at f.2.8 using a 25mm lens. Depth of field was 3 inches past the screen I think and 2 inches in front.
The 7218 gives a even fine grain low contrast look without hot spot.
However I did also black board my entire laptop to avoid flare on the image.
To see the results....Channel 4 (U.K Television) 7.55 after CH4 News, 27/5/04...a 3min film by me.
Astro

Post by **john jay** » Tue May 25, 2004 9:17 pm

Yes the vignetting is a problem, i'm thinking of using a field lens to correct
it

go here for theory
http://www-optics.unine.ch/education/op ... _lens.html

also the colour cast is a problem - need to try a few filters