Just to let you know - it seems we're almost go! We've got a bunch of ultra-high efficiency LEDs from Agilent (6=B0 viewin= g=20 angle, If max: 30mA Luminous intensity, max @ If: 18400mcd , min @ If:=20 4700mcd) mounted in a circle pointing up to a white plastic hemisphere,=20 large part pointing down, with a hole in the top so the camera may look=20 into it to the parts below. This is a pretty uniform illuminator, and=20 the red color is almost the same as the oil. We've had to blow the oil droplets with many needle holes in a=20 rectangular tube, forming like an air shower. This at least lowers the=20 droplets and the illumination, as the oil is almost red, does the rest=20 of the trick. I'm almost ready for the test setup tomorrow in the client's machine,=20 wish me luck ;-) Thanks everybody for the suggestions, without you this could not be=20 accomplished. Francisco -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads