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Message: <blockquote data-quote="MoonManMike" data-source="post: 154344" data-attributes="member: 10151">Marcel, thanks for the reply.  I don't think I'll be upgrading the body from the D3100 for a long time, if at all.  So that wouldn't really affect my decision.crashton. some interesting comments thanks.  I have read elsewhere about the 55 having a cheaper feel to it than the 70.  The 55 is so much cheaper to buy, so I guess that could explain the cheaper feel.  I won't be using the lens heavily, so longevity isn't necessarily a real issue.  I'm really wondering what the difference is in operation.  What do you mean by 'internally focusing'?The filter size isn't necessarily an issue either, but is certainly something worth considering!</blockquote>