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Your magnification factor is SID divided by OID. [MF = SID/OID]

So for example:

If your SID was 40 and your SOD was 32

Your magnification factor = 40/32 = 1.25 -- This means the image will appear 25% larger than the actual object. (It's the size of 1 plus 25 percent more of the original.)

Example 2 if you're trying to figure out original object size:

Your object size equals your image size divided by the magnification factor (MF). [object size = image size/ MF]

If you have an object on an image that measure 70 inches when your SID was 100 and your OID was 65, how big was the original object?

MF=100/65= 1.54 (rounded)

Object size = 65/1.54 = 42.21

The object imaged was 42.21 inches before magnification.

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