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<blockquote data-quote="nickt" data-source="post: 498457" data-attributes="member: 4923">I have the Tamron 60mm. Some macro things I learned along the way....If it says 1:1 reproduction ratio, that means the real life subject is projected same-size on the sensor at your closest focus distance.Internal focus = the overall lens body length does not change as you focus.External focus = Body length does change with focus and you need to be careful you don't bang into your subject. Not a big deal really, just something to be aware of.Minimum working distance = minimum distance from the front of lens to the subject. In other words, &quot;how close to my subject do I need to be to get a 1:1 shot?&quot;Minimum focus distance = a confusing way of describing minimum working distance. It is the distance from the sensor plane to the subject. So you need to subtract the length of the lens to get your minimum working distance.</blockquote>

[QUOTE="nickt, post: 498457, member: 4923"] I have the Tamron 60mm. Some macro things I learned along the way.... If it says 1:1 reproduction ratio, that means the real life subject is projected same-size on the sensor at your closest focus distance. Internal focus = the overall lens body length does not change as you focus. External focus = Body length does change with focus and you need to be careful you don't bang into your subject. Not a big deal really, just something to be aware of. Minimum working distance = minimum distance from the front of lens to the subject. In other words, "how close to my subject do I need to be to get a 1:1 shot?" Minimum focus distance = a confusing way of describing minimum working distance. It is the distance from the sensor plane to the subject. So you need to subtract the length of the lens to get your minimum working distance. [/QUOTE]

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