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<blockquote data-quote="WayneF" data-source="post: 639130" data-attributes="member: 12496">You're right, my mistake was not seeing this Tokina M100 in the 1:1&nbsp; section (not even realizing I was looking for M100), so I landed on the&nbsp; second 1:2 section.&nbsp; It does say at 1:1, the M100 working distance is&nbsp; 115 mm (4.5 inches).It is an excellent site, but my complaint is that the table is an image&nbsp; (probably screen capture from Excel) so it is not text searchable.&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 page (on its Excel worksheet) says it uses a ruler to measure to the filter ring on the lens.&nbsp; That can be said to be the &quot;front&quot; of the lens, same as the specs show lens length as the overall, including extension inside the camera at the mount end.But actually, in the math (of the 1:1 magnification), &quot;subject distance&quot; is computed to the nodal plane normally inside the lens somewhere.</blockquote>

[QUOTE="WayneF, post: 639130, member: 12496"] You're right, my mistake was not seeing this Tokina M100 in the 1:1 section (not even realizing I was looking for M100), so I landed on the second 1:2 section. It does say at 1:1, the M100 working distance is 115 mm (4.5 inches). It is an excellent site, but my complaint is that the table is an image (probably screen capture from Excel) so it is not text searchable. :) The page (on its Excel worksheet) says it uses a ruler to measure to the filter ring on the lens. That can be said to be the "front" of the lens, same as the specs show lens length as the overall, including extension inside the camera at the mount end. But actually, in the math (of the 1:1 magnification), "subject distance" is computed to the nodal plane normally inside the lens somewhere. [/QUOTE]

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