8mm Forum: The lower the inch, the shorter the throw? Help please :)...

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Topic: The lower the inch, the shorter the throw? Help please :)...

Elyas Tesfaye
Jedi Master Film Handler

Posts: 520
From: Winnipeg, Manitoba, Canada
Registered: Nov 2012

posted February 13, 2015 11:22 AM

Hello all,

thanks to you all, I now know the significance of 'f' on lenses (The lower the 'f', the brighter it is)... I am now interested in inches and mm as related to throw distance. I think I might have a clue but it's always a better bet to go by our veterans, anyone [Smile]

?
Thanks in advance and hope you all are having an awesome weekend [Big Grin]

!!!

Cheers,
Elyas

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Martin Jones
Phenomenal Film Handler

Posts: 1269
From: Thetford , Norfolk,England
Registered: May 2008

posted February 13, 2015 11:49 AM

Yes, the lower the inch or mm figure the shorter the throw for the same size of picture.

--------------------
Retired TV Service Engineer
Ongoing interest in Telecine....

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Elyas Tesfaye
Jedi Master Film Handler

Posts: 520
From: Winnipeg, Manitoba, Canada
Registered: Nov 2012

posted February 13, 2015 12:07 PM

Hi Martin,

thanks a lot for the prompt response and have yourself a great weekend, good sir [Big Grin]

!!!

Elyas

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Paul Mason
Jedi Master Film Handler

Posts: 540
From: Aldershot, Hampshire, UK
Registered: Nov 2013

posted February 13, 2015 03:35 PM

Elyas,
An easy way to relate the lens focal length to the throw distance and picture size is to remember the ratio of the throw to the picture width. For example a 2 inch (51mm) lens on a 16mm projector has a throw of 5.2 times the picture width. A throw of 15 ft gives a picture of 2.88 ft wide with this lens. The ratio for a 1 inch (25mm) lens is half of 5.2 ie 2.6, so a 15 ft throw gives a picture 5.77 ft wide.

--------------------
Paul.

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Elyas Tesfaye
Jedi Master Film Handler

Posts: 520
From: Winnipeg, Manitoba, Canada
Registered: Nov 2012

posted February 14, 2015 07:57 PM

Hello Paul,

thanks a lot for that detailed explanation, I'm learning so much from all you helpful forum members and can't thank you enough [Big Grin]

!!!

Cheers,
Elyas

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Dino Everette
Phenomenal Film Handler

Posts: 1535
From: Long Beach, CA USA
Registered: Dec 2008

posted March 09, 2015 01:03 AM

Elyas, just remember when it comes to lenses "LESS IS MORE"

1 - The lower the inch or mm, the larger the picture
2 - the lower the "f" number the brighter the picture...

--------------------
"You're too Far Out Miss Lawrence"

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Elyas Tesfaye
Jedi Master Film Handler

Posts: 520
From: Winnipeg, Manitoba, Canada
Registered: Nov 2012

posted March 09, 2015 01:43 PM

Hi Dino,

thanks for the tip and hope you're having an awesome start to the week [Smile]

!!!

ET

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