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Message: <blockquote data-quote="BackdoorArts" data-source="post: 242528" data-attributes="member: 9240"><p>I've got the Sigma 105mm and use it on mu FX lenses and find that it's just about perfect.  It gives me 1:1 shots just fine, is super crisp, and it's just about the right focal length for most of what I want/need.  I can use extension tubes and 2x converters if I need to get closer (snowflakes), but that's the exception.  On a DX body like yours this would be fine.  I'm trying to imagine working with a 150mm on my FX body and am thinking it's too much, so I can't imagine what a 225mm macro would be like (how the 150mm would act on your D3100).  I say go with the 105mm unless your goal is to shoot flies eyes mold spores.  You're still going to need to get that tripod in the mud with the 150.</p></blockquote><p></p>