I was out doing drone photography at a local gravel pit. noticed a reflective disc at what appeared a very very high altitude. took many photographs using a cannon t3i 75 to 200 lens and a binocular camera. the reflective disc was quite visible in all photo's. when i returned home later that day and viewed the photos on my monitor. it was then that i discovered the translucent discs. initially i thought the translucent discs were lens imperfections or dust on my camera mirrors. however when the objects appeared on photographs from both cameras there had to be another explanation.