8mm Forum: Projection lens and screen size

»	8mm Forum » 8mm Forum » Projection lens and screen size

UBBFriend: Email this page to someone!

Author

Topic: Projection lens and screen size

Rui Luis
Film Handler

Posts: 58
From: Lisboa, Portugal
Registered: Aug 2013

posted October 24, 2015 04:12 PM

Hello, i like to know if exist some kind of way or formula to calculate the maximum size of projection screen can each specific lens do.

For example what the maximum size of screen can do a f: 1.4 F: 25-50 mm lens?

Thanks

| IP: Logged

Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted October 24, 2015 05:30 PM

Luis, I'm not sure I understood your question : do you want to know the sizes you can get from your lens according to the projector/screen distance (the aperture, as far as I know is not involved) or do you want to know the theorical limit ? In the first case, there are tables that give you theses sizes, in the second case, I have no idea if there is a way to calculate that.

--------------------
Dominique

| IP: Logged

Rui Luis
Film Handler

Posts: 58
From: Lisboa, Portugal
Registered: Aug 2013

posted October 24, 2015 05:32 PM

Hi Dominique, thanks! is the second, where i can get that tables?

Thanks

| IP: Logged

Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted October 24, 2015 05:40 PM

You can find them in projectors manuals or in books for cine amateurs. I have a small table in front of me but should have others. For example, with a 25 mm super 8 lens, you get a 0,42 x 0,31 picture for a 2 meters distance, a 1,27 X 0,95 one for 6 meters and 2,56 X 1,92 for 12 meters.

--------------------
Dominique

| IP: Logged