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I am trying to figure out what magnification my camera lens is shooting at, so I took a silver oxide battery and measured it with my digital calipers. It read out at 7.76 millimeters. I then took a picture of the battery with my lens at close focus and used a macro focusing rail to make minor adjustments to the focus and opened up the image in Photoshop CS6. I set the units to millimeters and used the ruler tool to measure the battery in the image. It said the battery was 660 millimeters. I am sure I did something wrong in the PS settings. I have included the image here. Would somebody please measure the battery in the image and tell me if I did something wrong? Thank you in advance for any help you can give me!


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