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<blockquote data-quote="nickt" data-source="post: 723841" data-attributes="member: 4923"><p>I lost track of the Tamron generations long ago. Not sure when the focus motor came along. Focus motor aside, another notable change over the years was going from external to internal focusing. The external focusing means that the lens barrel extends as you focus closer. Its hard to pick this up from the specs. Normally they list minimum focus distance in the specs. That is the distance from the sensor plane to the subject. This tells you nothing about the barrel length. The spec known as 'working distance' does take the barrel into account. Working distance is the distance from the front of the lens to the subject. They often don't list this parameter, you have to go digging for it. I think Scott had the extending barrel and never complained. Some bug shooters don't like the extending barrel.</p><p>I have the Tamron 60mm and the Sigma 105</p></blockquote><p></p>
[QUOTE="nickt, post: 723841, member: 4923"] I lost track of the Tamron generations long ago. Not sure when the focus motor came along. Focus motor aside, another notable change over the years was going from external to internal focusing. The external focusing means that the lens barrel extends as you focus closer. Its hard to pick this up from the specs. Normally they list minimum focus distance in the specs. That is the distance from the sensor plane to the subject. This tells you nothing about the barrel length. The spec known as 'working distance' does take the barrel into account. Working distance is the distance from the front of the lens to the subject. They often don't list this parameter, you have to go digging for it. I think Scott had the extending barrel and never complained. Some bug shooters don't like the extending barrel. I have the Tamron 60mm and the Sigma 105 [/QUOTE]
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