Horrible spots on dendrobium leaves

[Bethy]

I hope this clarifies the growing conditions:
Temperatures - typical indoor temps 68-75
Humidity - indoor fountain and humidity tray
Light - bright, southeast window
Water - The leaves were misted in the afternoon, and the next day, 3 were spotted and looked sickly.

Maybe the leaves were old. Perhaps the orchid didn't like the afternoon water spritz. At any rate, the orchid now seems to be doing fine—no more leaf damage.