Black spots/patches on cymbidium leaves

[mexicowpants]

Hi there, hope someone can help with the diagnosis of the black spots/patches that have appeared on my cymbidium plants recently, also on a couple of my epidendrum. My guess is it's too much water -- we've had a lot of very wet and humid weather recently, and the potting medium has had a pretty tough job drying out, despite the plants being outside in the breeze and that I've been holding right back on the water -- but I'd just like to have my mind put at ease, and rule out any possibly more serious problems...

Thanks in advance!