Orchid virus? Pest? Help!

[fenderfemme]

Hi,

I've recently bought three new orchids, a zygopetalum and two Cambria.
(Colmanara Masai Red & Miltonidium Bartley Schwarz).


My Zygopetalum is doing fine, it's finished flowering and is having a bit of a rest.


The two cambrias are still flowering but have developed black spots on their leaves. It originally started on the Colmanara but has recently appeared on the Miltonidium.

My thoughts are it's either a virus or spider mites, I haven't seen any mites on the plant though.
I can only upload one photo for some reason.
Can anyone help??

I don't want to lose them