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Author Topic: Why do I see an inverted image from a 9.5mm Pathescope projector?
Guy Burns
Junior
Posts: 10
From: Devonport, Tasmania, Australia
Registered: Apr 2017


 - posted May 31, 2017 08:44 AM      Profile for Guy Burns   Email Guy Burns   Send New Private Message       Edit/Delete Post 
I'm using a Pathescope 9.5mm GEM projector as an editor. So as not to cause any damage to the films, I run the films very slowly at about 25% speed, and use a low power light source – without any modification my Zebralight torch fits in place of the original 100 Watt bulb. I run the Zebralight at its lowest setting.

See these two images:

http://www.mediafire.com/view/fu47qa9tjqa1afu/Projector_01.jpg
http://www.mediafire.com/view/aq6apypayq0a0cd/Projector_02.jpg

To view a film I simply look straight into the lens – and I see an inverted image.

What I can't explain is why the projected image appears the right way up. So, sitting in front of the projector:

• I can see the film entering the gate is upside down
• Looking through the lens the image is upside down
• But replace my eye with paper, and the image is right-way up.

Why is that? Maybe I've been peering through the wrong end of the lens for too long.

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Guy Burns
Junior
Posts: 10
From: Devonport, Tasmania, Australia
Registered: Apr 2017


 - posted May 31, 2017 10:18 PM      Profile for Guy Burns   Email Guy Burns   Send New Private Message       Edit/Delete Post 
This question is about Physics, so I've taken it to the Physics forum (https://www.physicsforums.com/threads/image-is-inverted-when-i-look-into-a-projector-lens-why.916257/).

Moderator: delete if you want.

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007


 - posted May 31, 2017 11:25 PM      Profile for Maurice Leakey   Email Maurice Leakey   Send New Private Message       Edit/Delete Post 
Guy
The simple answer is that the lens is acting just like a magnifying glass when you look into it.

--------------------
Maurice

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Ken Finch
Jedi Master Film Handler

Posts: 543
From: Herne Bay, Kent. U.K.
Registered: Oct 2011


 - posted June 04, 2017 02:50 PM      Profile for Ken Finch   Email Ken Finch   Send New Private Message       Edit/Delete Post 
Guy, The answer is in the word "Projector". The lens inverts the picture as it projects the image onto the screen. A projector is not a viewer. The images are always inverted as they pass through the projector gate no matter what gauge of film it is. Ken Finch. [Smile]

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