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How are Bolex Viewfinders RATED???

Arthur Sanchez

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I think it's related to the apparent size of an object when viewed at a distance of 25cm. This would be called 1x. So if you place a frame of 16mm film which has a width of 10.25mm at a distance of 25cm, it will have a width of 1x. A 6x viewfinder would display an image which appears 6 times as wide.

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