05. What is a Lens Projector Introduction to the World of Cinema Lenses

05. What is a Lens Projector Introduction to the World of Cinema Lenses


Hi everyone welcome back. Now we’re going to be looking at testing the lenses that we were talking about on a lens projector. If we were to see that this is calibrated to 52 millimeters in the right shim is inside we put it onto a lens projector that is simulating a camera it shooting a beam of light through a pattern onto a wall and we’re at six feet or any determined distance that we want to choose when you turn the moving back and forth you can see the pattern going the focus point of assuredness. We look at the lens and the lens should match up at six feet of the distance that we chose. If it doesn’t we know that the lens is out of focus and we have the Schmit either have a thousands of thousands in one direction or another. You can also see by the patterns that there is Super 16 Super 35 and the engine is the center. This is considered normal and acceptable to a certain quality of lenses and vintage lenses at this point you could actually see how much of it is soft on the edges. So when you put on a film camera or a video camera you can visually see and aesthetically tell that there is some softness to it and this type of a test we can measure it by looking at how many lines per resolution is in focus and how many inches away from the center goes out of focus.

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