Macro and Close-up Lenses
By its very nature, macro photography (and to a lesser degree close-up photography) has always caused challenges for lens manufacturers, and this is no different for digital cameras.
What has changed is the ease and precision of shooting at close distances, because the uncertainties introduced by the various optical calculations disappear with the instant feedback from a DSLR.
DSLRs are ideal for macro shooting, because the on-board processing of the image can deal with the problems of contrast, color, and even sharpness. Also, by shooting direct to a computer, you can use the larger monitor to check detail and tolerances. ...