If your silkscreen is too close to the toes of your leads, you can bring the lead bank inspection box in a little bit to compensate. I haven't had many issues with tantalum caps. I inspect those under white light with no filter just fine, but then you are dealing with another vendor. Try different light sources with different filtering to see what works best. The disadvantage to multiple light sources is it adds time to your inspection, at least on the M1. The F1, if I'm not mistaken, has the ability to do single pass inspection (Oh if I could do it over again). If it's a contrast issue, this should fix it; however, if your markings are not consistent, nothing will help. This is the issue with the etching on the crystals. Even if you get good contrast, you are dealing with inconsistent font. About the only thing you can do is lower your pass score to an acceptable level, or do a presence/absence inspection. Solder inspection on the top can works great for this, but you run the risk of having the wrong crystal installed. Do you do any functional testing on this product? If so, then this should alleviate any fears of wrong placements (aside from the rework involved of course).
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