Macro vs close-up

Started Feb 28, 2013 | Discussions thread
joejack951 Senior Member • Posts: 2,682
Re: Not to mention the real confusion

Leonard Migliore wrote:

The real problem with magnification numbers is that they're somewhat abstract. A 1:1 image is 1:1 on the sensor. But how big is the sensor? Could be 24mm X 16mm, 36mm X 24mm, or something else. In either case, no one looks at the image at that size, it's magnified on a screen. So you shoot an insect at 1:1 and it's 10X life size on your monitor.

I've never seen a reproduction ratio quoted for anything but an interchangeable lens which removes most (but not all) of the abstraction. Compact cameras, for instance, only quote minimum focus distance, at least in all the specs I've ever read.

The only confusing thing is when using an FX 1:1 lens on a crop camera. You have to multiply the reproduction ratio by the crop when comparing to a native lens for that crop format.

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