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1:2.0 Super 35 groundglass


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#1 Tammo van Hoorn

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Posted 05 March 2006 - 06:51 AM

Hi

I'm prepping a job this week where i've been asked by the DP to prepare an unusual aspect ratio. We're shooting super 35 and he wants a 1:2.0 groundglass. The suggestion would be to get a 1:1.85 super 35 groundglass and 'pencil' in the 1:2.0 aspect. Any suggestions as how I could work out the measurements for the pencilled in aspect ratio in relation to the 1:1.85 groundglass?

Many thanks

Tammo van Hoorn
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#2 Stephen Williams

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Posted 05 March 2006 - 08:36 AM

Hi

I'm prepping a job this week where i've been asked by the DP to prepare an unusual aspect ratio. We're shooting super 35 and he wants a 1:2.0 groundglass. The suggestion would be to get a 1:1.85 super 35 groundglass and 'pencil' in the 1:2.0 aspect. Any suggestions as how I could work out the measurements for the pencilled in aspect ratio in relation to the 1:1.85 groundglass?

Many thanks

Tammo van Hoorn



Hi,

24mmx12mm will be S35 1:2.0

24mmx12.97mm is S35 1:1.185

So Basically a line 0.5mm inside the 1:185 on top and bottom.

Cheers,

Stephen
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#3 Tammo van Hoorn

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Posted 05 March 2006 - 09:49 AM

Hi Stephen

Fantastic! Thankyou very much. If you don't mind me asking, where did you find these measurements? Is it an aspect ratio you have used before or just a simple relative mathematical relationship you've worked out.

Many thanks again

Tammo van Hoorn

PS Edit: Sorry I wasn't thinking. Logical:

24mm divide by 1.85= 12.97
24mm divide by 2.0= 12

Edited by Tammo, 05 March 2006 - 09:58 AM.

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#4 Hal Smith

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Posted 05 March 2006 - 11:31 AM

Hi Stephen

Fantastic! Thankyou very much. If you don't mind me asking, where did you find these measurements? Is it an aspect ratio you have used before or just a simple relative mathematical relationship you've worked out.

Many thanks again

Tammo van Hoorn

PS Edit: Sorry I wasn't thinking. Logical:

24mm divide by 1.85= 12.97
24mm divide by 2.0= 12

Tammo,

There's a great page containing links to calculators and image sizes on Panavision New Zealand's website at:

http://www.panavisio...base.asp?cat=13

Edmond, OK
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#5 Tammo van Hoorn

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Posted 05 March 2006 - 12:11 PM

Great. Thankyou. Excellent reference site.

All the best

Tammo
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#6 Daniel Stigler

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Posted 06 March 2006 - 10:35 PM

Hi Tammo!
Here's another useful link: http://www.arri.de/i...ormat_guide.pdf
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#7 Daniel Stigler

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Posted 06 March 2006 - 10:49 PM

When i have to add lines to a groundglass i add the new lines to the used groundglass in Photoshop and print this in it's original size. Then i put the groundglass on the paper with the markings on the groundglass exactly matching the lines on the print. I then stick scotchtape on the groundglass to add the new markings. This is very hard to do if you're alone so it's a good idea to have some help available. Another good idea is to shoot a frameleader after the modified groundglass is installed.

All the best for the shooting!
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#8 Tammo van Hoorn

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Posted 07 March 2006 - 10:51 AM

Great! Thankyou Daniel. I've made up the groundglass now using a similar technique to yours. Having projected both the 1.85 and 2.0 g.glasses its actually come out pretty well!

Many thanks again for your helpful advice.

Tammo
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