I won't even go much into telling you what ratios are. Basically the numbers on the left are proportional to those on the right. Dead simple. 640/480=3/2. Most SLR's shoot at around 4x6, perfect for proofs. 8x10's are the format of evil. Since an 8x10 is 5:4 ratio, you crop out a ton. We should switch standards to 4x6, 6x9, 8x12, etc. It would make life so much easier.
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