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<blockquote data-quote="nickt" data-source="post: 361717" data-attributes="member: 4923">Blacktop, there are two Tamron 90mm currently available. The older one is less expensive and the barrel extends as you focus close. The newer one is internal focus and the barrel does not extend as you focus.&nbsp;I have the Tamron 60mm macro. At the time, I preferred the 60 to the 90 with the extending barrel. Both will do 1:1, The extra focusing distance of the 90 was eaten up by the extending barrel. Had the new version been available, I probably would have gotten that, but I'm still happy with the 60. The 90 will go with you if you go FX.If you are not already familiar, be aware of the difference between minimum focus distance vs working distance. Many macros only list minimum focus distance. That is measured from the sensor plane to subject. You need to subtract the length of the lens to get the working distance. The working distance is more meaningful since that is measured from the front of the lens to the subject. That is usually what you want to know... how far away you can be and still get 1:1. That means the image on the sensor is the same size as the real life object.</blockquote>

[QUOTE="nickt, post: 361717, member: 4923"] Blacktop, there are two Tamron 90mm currently available. The older one is less expensive and the barrel extends as you focus close. The newer one is internal focus and the barrel does not extend as you focus. I have the Tamron 60mm macro. At the time, I preferred the 60 to the 90 with the extending barrel. Both will do 1:1, The extra focusing distance of the 90 was eaten up by the extending barrel. Had the new version been available, I probably would have gotten that, but I'm still happy with the 60. The 90 will go with you if you go FX. If you are not already familiar, be aware of the difference between minimum focus distance vs working distance. Many macros only list minimum focus distance. That is measured from the sensor plane to subject. You need to subtract the length of the lens to get the working distance. The working distance is more meaningful since that is measured from the front of the lens to the subject. That is usually what you want to know... how far away you can be and still get 1:1. That means the image on the sensor is the same size as the real life object. [/QUOTE]

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