Hi,
When desiging the PWB for fiducials, what is the experience of 
having the solder resist up to the edge of the fiducial pad.
 
If the recommended clearance window round (2-3 x fiducial radius)
the fiducial is not maintained does this in general cause excessive
vision system problems, - looking at the solder resist compared to 
looking at the laminate material.
 
I understand that this clearance should be left with no resist and 
leaving the bare PWB laminate and etched fidicial feature.
 
What is the prefered fiducial shape used by most designers?
 
Thanks in advance for any information.
D. McCall.
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