8mm Forum: Elmo 16CL screen size?

This is topic Elmo 16CL screen size? in forum 16mm Forum at 8mm Forum.

To visit this topic, use this URL:
https://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=5;t=000262

Posted by Den Brown (Member # 819) on January 07, 2008, 04:06 PM:

If an Elmo 16CL is positioned 6 metres from the screen, what size image will be projected?

Thanks.

Posted by Hugh McCullough (Member # 696) on January 07, 2008, 05:35 PM:

Allowing for manufacturing tolerances the approx sizes will be

35mm lens Pic size approx 1.25 metres x 0.9 metres
50mm lens Pic size approx 0.95 metres X 0.70 metres
75mm lens Pic size approx 0.63 metres x 0.47 metres

Posted by John Whittle (Member # 22) on January 07, 2008, 05:37 PM:

There are charts for this, but you can use basic math as well. However you have left out one variable that makes the answer impossible--the lens focal length. The factors you need to know are the width of the 16mm frame (.380 inches) the focal length of the lens and the distance to the screen. All measurements must be in the same unit and since I don't have the metric for the width at hand, you'll have to accept english measure. For your 20 foot throw with a 2 inch lens, the width should be about 40 inches. (If my basic math is correct). A scope picture would be 80 inches wide.

UBB.classic^TM 6.3.1.2