Jan 21, 2009 13:29 | #1 I took a pic of some particles of sand using the lens with all the extras mentioned in the title. If I want to say that this particles are enlarged by x amount, How's the math done? or better yet if you know the answer, How should I describe the exact enlargment of the photo? Thank You Canon 5DMKIV + Grip | 5DMKII + Grip | 85mm f/1.4L II | 50mm f/1.8 MKI | 70-300mm f/4-5.6L | 24-105mm MKII IS f/4L | 580EXII | Extension Tube EF 25 II
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JC4 Goldmember  2,610 posts Likes: 3 Joined Apr 2007 Location: Columbus, Ohio More info | Jan 21, 2009 13:34 | #2 Take a pict of a ruler at MFD. Use the width of your capture, divided by the width of the sensor. That's your answer. John Caputo
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 | x 1600 |
| y 1600 |
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