I thought I'd add this in case anyone is interested.
Anyway, I recently realised that my comment on smaller sensor not being so good for macro work is in fact incorrect.
It is often said that smaller sensors have more depth of field, but I have never understood this. Well DOF is a function of aperture and image magnification only. Reducing the aperture increases the DOF. Increase the image magnification reduces the DOF. That is why we usually use very small apertures for insects and other small objects.
That second point is I believe the reason why a smaller sensor has larger DOF. Consider a full frame camera and an APS frame camera both using the same lens at the same aperture. Let's assume that we are taking the same picture, thus the APS camera must be further away, and the image magnification will be lower. By that I mean that the ratio of the subject size to the image size, where image size is measured on the sensor, is less. And so DOF in the DX image is greater.
I would guess that the difference is about 1 stop. So a lens working at F16 on a DX sensor would give similar DOF to the same lens working at F22 on a full frame sensor. Again this assumes the 'same' image.
So my conclusion is that APS cameras are just as good as full frame ones for macro.
However, although for macro more DOF sounds good, many people like to use shallow DOF for artistic effect e.g. to highlight part of a scene. That I think is an important reason why some people do not like APS cameras.
Leif
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