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Old September 25th, 2008, 11:54 AM   #1
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Why 35mm

I guess this is about as Noob as of question that i could ask. Can someone point me in the right direction or explain how exactly this works and what it does.
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Old September 25th, 2008, 12:52 PM   #2
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Short Course:

1. Image size projected on the imager has a direct relation to the depth of field in the image. Coupled with the focal length of the lens and iris opening, film makers are able to control depth of flield.

2. 35mm film camera have large imager (film frame on the film), and generally provide a shallower depth of field. As film watchers we have grown accustomed to out of focus backgrounds, etc, and this look is the look of film we seek in video.

3. Video cameras have a deeper depth of field (more in focus) in a given angle of view, because of the smaller size of the image (ccd or cmos chip.)

4. 35mm adapters are used to project the 35mm image on a screen that is then videoed by the camera. The resulting image has the depth of field characteristics of 35mm as a result.

5. There are three types of screens used to project image:

A static screen is not moving, but grain, dust and blemishes will appear in image.

A vibrating screen is second type as used in most Letus and Brevis adapters. It trys to eliminate screen grain, blemishes and dust.

A spinning disk is the third type. Redrock, SGpro, are examples. In this case the image is project by 35mm lens on a spinning disk. The Letus Ultimate, as I understand it has spinning disk (at about $ 4,500).

6. Image flipping. One of the disconcerting issues with adapters is that they throw an inverted image. The manufacturers are now producing flipped images using mirrors or prisms to right the image.
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Old September 25th, 2008, 01:46 PM   #3
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awesome reply thanks for the info
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