Before the rush

Before the rush
by evan-pak

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2

@omega Here's what you are not getting: The 36x24 measurement is the size a classic photo negative taken with 35mm film. It is a well known and accepted measurement. 35mm film was a very commonly used film for 60+ years. Because format size (sensor or film size) determines angle of view for a particular focal length lens, and because 35mm film was so common ...


0

@omega Here's what you are not getting: The 36x24 measurement is the size a classic photo negative taken with 35mm film. It is a well known and accepted measurement. 35mm film was a very commonly used film for 60+ years. Because format size (sensor or film size) determines angle of view for a particular focal length lens, and because 35mm film was so common ...


1

From the exif data: Image size is 2988 pixels height by 5412 pixel length. The file states the actual focal length is 4.8. The file states this vale is the equivalent of a 31mm lens mounted on a full frame. From this we can calculate the crop factor = 31 ÷ 4.8 = 6.4583. The diagonal of a full frame, 24mm height by 36mm length = 43.27mm. The diagonal of this ...


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We draw imaginary line from the top and bottom of the object to the center of the lens. This traces out the image of a triangle. The base of the triangle is the distance, object to lens. The base of this triangle is the object’s height = 90 cementers X 10 = 900mm. The height of this triangle is the distance lens-to-object = 92 inches = 92 X 25.4 = 2336.8mm....


2

PPI has nothing to do with the calculation. I calculate the Note 4's 1/2.6" sensor's dimensions to be about 5.80mm × 3.27mm. So using 5.80mm as the sensor height (the image is in portrait orientation, so we need the sensor's long dimension for image height) in the equation in Matt Grum's answer in the question you linked to, and rearranging the equation to ...


2

You are missing something big. The size of the camera sensor is not mentioned. You need to know it, both in mm and in pixels. You didn't say any sizes, but Samsung says 3.7 megapixels, so if 4:3, that is 2221 x 1666 pixels. Samsung specs don't say. Your image will be this size though, you can know its pixel dimensions. The sensor mm is pretty difficult ...



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