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#1 Sivanesan

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Posted 18 December 2007 - 06:55 AM

Hi,
I want to correct the color temperature of my lighting kit...... is the following convertions is correct?


Film's Temperature 3200
Light's Temperature 2700
Mired Correction -58
Correctin Filter 80D


Film's Temperature 5500
Light's Temperature 6500
Mired Correction 28
Correctin Filter 81B

Regards
Siva
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#2 Jonathan Bowerbank

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Posted 18 December 2007 - 05:27 PM

Are you doing this for s***'s and giggles? Or are you seriously using lights of those color temps?

To correct the "daylight" source, you should just gel the light itself with a 1/4 CTO or so, instead of putting a filter on the lens. Same goes for the "tungsten" source and slapping on a 1/4 to 1/2 CTB.

Just curious, why is your tungsten light so low?
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#3 Michael Nash

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Posted 18 December 2007 - 06:25 PM

Just curious, why is your tungsten light so low?


Regular household bulbs are quite a bit under 3200, by varying amounts. I like to use 1/8 CTO on tungsten movie lights when trying to match the output of practicals.
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#4 John Brawley

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Posted 18 December 2007 - 09:13 PM

Are you doing this for s***'s and giggles? Or are you seriously using lights of those color temps?



I think Sivanesan is using those lamps. Looking at where he's from, his tone might not have come across in the way intended in the email.

It's not unusual at all for tungsten lights, domestic bulbs or even regular film fixtures to be under 3000K, and if that was the only light source and he wanted to be accurate, then the 80D or 80C would be the way to go.

And again with daylight sources, more often than not a HMI is up in that 6000k+ range, so if he was tring to match a daylight stock to that then that would be the way to go.

In that case though, it's a pretty big assumption to say that the daylight really is 5600K, cause more often than not it won't be. IN this case, it's better to try and gel the lights to match the daylight ambient.

The reality is Sivanesan that you don't have to be that accurate with your photography, because the power of modern colour correction means that it's easily adjusted later. It is a little more difficult once you start MIXING your colour temps, as would be the case with your daylight scenarios, and in this case you may want to pay a little more attention to the differences. As I said though, it's unlikely that your daylight will actually be 5600K and it changes a lot during the course of a day.

The boxing day test at the MCG won't be played under lights though, so you'll only have to account for the slight yellow green shift of the green and gold from the fans.....daylight aside of course

(err..sorry...cricket lighting humour)


jb
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#5 Chris Keth

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Posted 19 December 2007 - 12:29 AM

(err..sorry...cricket lighting humour)

jb


You mean that game that improved into baseball? ;)
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#6 Sivanesan

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Posted 19 December 2007 - 01:00 AM

OOps..... i think i made some mistakes in the post....... those filters 80D and 81B are camera filters...... sorry for the error......

my aim is to correct the color temp of the lights only.........

these bulbs are basically home lights....... we have fixed this on our own fixtures..... the colour temp of the warm bulbs are 2700k and day bulbs are 6500k as mentioned by the manfacturer....... these bulbs are from PHILIPS.......

in our earlier projects we have used these day light bulbs without gels to get a mild green tone.

i was going thru the lee website and found the following result.

The Calculator in the following page says this:

http://www.leefilter...products/mired/


Original Source Value (kelvin) 6500
Converted Source Value (kelvin) 5500
Mired correction value +28
mired of Eighth C.T. Orange (223) +26


Original Source Value (kelvin) 2700
Converted Source Value (kelvin) 3200
Mired correction value -58
mired of Quarter C.T. Blue (203) -35

Hope my tones will be under control...........

Regards
Sivanesan
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#7 Jonathan Bowerbank

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Posted 19 December 2007 - 01:34 AM

Sorry if I came off wrong, the "s***'s and giggles" only meant that I suspected you were just throwing out an equation to us to confirm your findings according to your calculations, and that you weren't throwing us a practical question that you REALLY needed, ha ha

I see now, I was under the impression that you were at least using studio grade lights.
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#8 Kirsty Stark

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Posted 19 December 2007 - 06:10 AM

You mean that game that improved into baseball? ;)


Improved???

I don't think so...
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#9 Mark Dunn

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Posted 19 December 2007 - 02:37 PM

The Americans adopted rounders before it refined itself into cricket, I think.
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#10 Jonathan Bowerbank

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Posted 19 December 2007 - 02:41 PM

Everything I know about the history of cricket, I learned from Douglas Adams...which is all lies and fantasy :)
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#11 Matthew Buick

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Posted 19 December 2007 - 06:03 PM

Everything I know about the history of cricket, I learned from Douglas Adams...which is all lies and fantasy :)


I've watched documentaries and read books on Douglas Adams, and I honestly think he was a bit of a tortured genius.
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#12 Chris Keth

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Posted 19 December 2007 - 09:25 PM

Improved???

I don't think so...


I couldn't resist. You British Empire dwellers are so protective of cricket. ;)
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#13 Daniel Sheehy

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Posted 19 December 2007 - 10:28 PM

The Americans adopted rounders before it refined itself into cricket, I think.

I don't think so.

Cricket traces it roots back to the 13th century.

Both baseball and rounders trace themselves back to the 18th centuries.

Cricket was cricket before America was even American ;)

Edited by Daniel Sheehy, 19 December 2007 - 10:32 PM.

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#14 Tim O'Connor

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Posted 20 December 2007 - 12:38 AM

I don't think so.

Cricket traces it roots back to the 13th century.

Both baseball and rounders trace themselves back to the 18th centuries.

Cricket was cricket before America was even American ;)


You agree then that brand new is better?

Also, although we usually don't tell non-Americans this, if you look at the structure of the game in mathematical
terms the game clearly lays out a unified field theory that explains everything.


Good luck with your productions, Sivanesan.
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#15 Jonathan Bowerbank

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Posted 20 December 2007 - 12:56 PM

I've watched documentaries and read books on Douglas Adams, and I honestly think he was a bit of a tortured genius.


You should READ Douglas Adams
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#16 Daniel Sheehy

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Posted 20 December 2007 - 03:27 PM

You agree then that brand new is better?

No.

Come on, what isn't there to love about cricket? Its one of those sports that can cause diplomatic outrage, and cause country relationships to go from friendly to icy.
The New Zealanders have yet to forgive the Australians for that infamous delivery in 1981.

To be honest, I've never understood how you can call it a 'World Series' when no one else in the world takes part. ;)

Edited by Daniel Sheehy, 20 December 2007 - 03:31 PM.

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#17 John Brawley

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Posted 20 December 2007 - 04:07 PM

To be honest, I've never understood how you can call it a 'World Series' when no one else in the world takes part. ;)


Hear Hear !

jb
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#18 rohtash chandel

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Posted 21 December 2007 - 09:35 AM

Improved???

I don't think so...


Edited by rohtash chandel, 21 December 2007 - 09:38 AM.

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#19 rohtash chandel

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Posted 21 December 2007 - 09:47 AM

You agree then that brand new is better?

Also, although we usually don't tell non-Americans this, if you look at the structure of the game in mathematical
terms the game clearly lays out a unified field theory that explains everything.


Good luck with your productions, Sivanesan.

YEAH I GUESS WHEN CRICKET WAS INTRODUCED TO SOME GENIUS WHO COULD NOT DEAL WITH THE BOUNCE, DECIDED TO PLAY IT DIFFERENTLY AND THUS BASEBALL WAS BORN........... I GUESS AS FAR AS MATHEMATICAL CACULATIONS ARE CONCERND DUDE JUST TRYN DEAL WITH THE BOUNCE AND THE MOVEMENT OFF THE WICKET AND FROM THE WICKET........SOUNDING COMLICATED!!!!!!!!THIS IS JUST THE BEGINING
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