Macro vs close-up

Started Feb 28, 2013 | Discussions thread
joejack951
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Re: Not to mention the real confusion
In reply to slimandy, Feb 28, 2013

slimandy wrote:

joejack951 wrote:

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.

It's much simpler than that. At 1:1 the image records the same size as the object. A 1 inch object will record 1 inch on a sensor, so it will fill a DX sensor which is 1 inch across but will only be 2/3rds the size on an FX sensor which is 1.5 inches across.

Now that I think about it more, you're right. For a given number of pixels, you can get more pixels on a smaller (than a full frame sensor) subject with the crop cameras, but you don't actually increase the reproduction ratio. I'm not sure how I tripped myself up with that concept.

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