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<blockquote data-quote="WayneF" data-source="post: 184041" data-attributes="member: 12496">Nothing is simple Bill.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />The lens will focus at 1:1 at the same working distance on either camera, FX or DX. The lens is the lens and it does what it does, no matter what.The difference is this:If you did this at distance for 1:1 on DX, the&nbsp; 1:1 image would be 1.5x larger than your sensor, i.e., cropped.&nbsp; But it is still 1:1, meaning same size on the sensor as in real life, what you can see of it.This made more sense in film days, 1:1 is same size on the film as in real life.&nbsp; Say 1/2 inch tall either way for example, is 1:1.&nbsp; Same size projected onto digital sensor too, we just cannot take it out and look at it.But the cropped view of DX is smaller, so for the same view (same field width) you have to back away 1.5x farther.&nbsp;&nbsp; Then you get same view, but it is not 1:1, it is more like 1:1.5 (called 67%, 1/1.5).For example, consider copying a 35 mm slide with the macro lens.On FX, you do 1:1, and the slide is the same size on the sensor as real life.&nbsp; A good copy.On DX, you have to hold the slide further forward, so it becomes only 67% size (1.5x ratio) and then its image fits on the smaller DX sensor, and again, you get a good copy. But it is not 1:1.</blockquote>

[QUOTE="WayneF, post: 184041, member: 12496"] Nothing is simple Bill. :) The lens will focus at 1:1 at the [B]same working distance [/B]on either camera, FX or DX. The lens is the lens and it does what it does, no matter what. The difference is this: If you did this at distance for 1:1 on DX, the 1:1 image would be 1.5x larger than your sensor, i.e., cropped. But it is still 1:1, meaning same size on the sensor as in real life, what you can see of it. This made more sense in film days, 1:1 is same size on the film as in real life. Say 1/2 inch tall either way for example, is 1:1. Same size projected onto digital sensor too, we just cannot take it out and look at it. But the cropped view of DX is smaller, so for the same view (same field width) you have to back away 1.5x farther. Then you get same view, but it is not 1:1, it is more like 1:1.5 (called 67%, 1/1.5). For example, consider copying a 35 mm slide with the macro lens. On FX, you do 1:1, and the slide is the same size on the sensor as real life. A good copy. On DX, you have to hold the slide further forward, so it becomes only 67% size (1.5x ratio) and then its image fits on the smaller DX sensor, and again, you get a good copy. But it is not 1:1. [/QUOTE]

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