8mm Forum: screen size please

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Topic: screen size please

Mark Todd
Film God

Posts: 3846
From: UK
Registered: Aug 2003

posted February 26, 2006 09:55 AM

Hi I wonder if someone could please tell me what size picture a 20mm lens on 16mm will give at 10-12 feet distance from the screen.
Many thanks Mark.

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Bob Pucci
Jedi Master Film Handler

Posts: 520
From: Westerly,RI
Registered: Jun 2003

posted February 26, 2006 04:01 PM

Hi Mark Don't know if this will help but try this site.

http://www.paulivester.com/films/projector/throw.htm

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Mark Todd
Film God

Posts: 3846
From: UK
Registered: Aug 2003

posted February 28, 2006 02:34 PM

Thanks Bob had ago at working it out frm there, be great if someone had chart for the 20mm, looking at thats as best I can I`d say its about where I want it.

Best Mark.

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David Park
Master Film Handler

Posts: 346
From: UK
Registered: Nov 2003

posted March 05, 2006 03:10 AM

Takeing your lens to be 3/4"
At 10' screen width approx 5 ft
At 12' it would be approx 6 ft.

I have used a formula in a B&H user manual
I give it here so you can check my maths.

Screen width (ft) = 0.38 X projection distance (ft) then divide this by focal length (inches)

I also have another manual giveing it in metric.

Width (Meters) = Distance (meters) X 9.65 then divide this by focal length (mm)

Trust this helps, let us know how you go on.

--------------------
Regards,
David

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Mark Todd
Film God

Posts: 3846
From: UK
Registered: Aug 2003

posted March 05, 2006 07:38 AM

Thanks David, very handy indeed, my screen at present is 5,5 feet and about 11 feet give or take so sounds about right.
Best Mark.

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