On the Oncidium, I believe this is a common thing steming from spray the leaves while it is growing. They, typicallicaly don't like this. The yellowing could be from old back leaves or from lots of light. Neither is is cause to worry. The black spots might mean you want to quit spraying the leaves (if you doing this).
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)
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