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11-17-2009, 12:54 PM   #16
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QuoteOriginally posted by dehanson1 Quote
So, how can I tell a true macro from a not-so-true macro in these brands?
Look at the magnification specified. A true macro lens has 1:1 magnification (objects appear at life size at the sensor). Some older dedicated macro lenses only have 1:2 magnification but can still be considered to be macros.

A close focusing lens (need not be a zoom, e.g., take the Sigma 28/1.8 EX Macro from Sigma) has much less magnification. The Sigma lens has a close focusing distance of 20cm (which is measured from the sensor plane, i.e., you can almost touch the object with the lens) but only a magnification of 1:2.9. You can do impressive shots with it but not the "insect fills the frame" kind of macro shots.

11-17-2009, 03:28 PM   #17
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QuoteOriginally posted by jerrymouse Quote
Tamron 90/2.8, Sigma 70/2.8, Sigma 105/2.8, Vivitar Series 1 105/2.5
Like he say's.

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