The Planted Tank Forum - View Single Post - Tell me about diopters aka close-up filters
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Old 10-27-2012, 03:56 AM   #15
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Originally Posted by TickleMyElmo View Post
You're kinda looking at the wrong thing, its close focus AND reproduction ratio that you should be looking at. Reproduction ratio being the biggest issue.

The 17-55 has a 1:5 reproduction ratio. The lower the second number (or the closer the second number is to 1), the bigger the subject will appear.

For example, a lens with a close focus of 2.25' but a reproduction ratio of 1:2 will magnify the subject/make the subject appear larger than a lens with a 1.25' close focus but a reproduction ratio of 1:5....

Get it?
Ultimately, with close focus distance being equal, what makes the reproduction ratio get closer to 1:1? Is it how much/far it can telephoto?
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