Você procurou por: foco de tenue (Espanhol - Inglês)

foco de base
basic focus

foco de incendio
seat of fire

foco de gas comprimido
high-pressure gas light source

foco de plasma denso
dense plasma focus device

mucho me temo que mi agradecimiento debe ser así de tenue.
(at present it has reached the limit of its capacity.

fue una formación de tenues estrellas voladoras como las que se muestran en el cuadro.
it was a small dim stars flying formation as shown in the picture.