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Message: <blockquote data-quote="BF Hammer" data-source="post: 845112" data-attributes="member: 48483">A true macro lens can focus down to 1:1 magnification without aid of an extension tube. So when you do your slide scans with the adapter, the image would just be able to cover the sensor at the minimum focus distance. Adding extension tubes would allow magnifying beyond 1:1 by some formula that I never really want to remember. The MC 105mm is a 1:1 macro lens.Now the footnotes:  That MC 105mm used on a DX camera will make a 1:1 sized image that is larger than the physical size of the sensor, so it appears to be zoomed closer and magnified. Some lenses that claim to have macro capability really are a 1:2 reproduction which is half-sized. That is usually printed on the lens somewhere.I used an extension tube to take this photo with my Z MC 105mm, but I don't remember if I did a bit of a crop in post. I am sure I only used the 18mm Z-mount extension, but I do have a 2nd 11mm tube also which I can stack. Sorry, IMGUR strips the exif.<img src="https://imgur.com/xwi2BYP.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Ordinarily I shoot without the tubes and backed off enough to see the whole watch. But I can fill most of a frame with a watch dial without resorting to an extension.<img src="https://imgur.com/Nl2n9Hv.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>