It came out, that it were dew traces at outer lenses only. I was able to clean it with stronger than isopropyl liquid for photo lenses.
But anyway, Vixen SG has strange feature: eyepiece lenses fogged out almost every time, i take them in house. I need to mention, that i live in a high humidity area. In house humidity is around 35-45%, while outside is 80-95%.
Last edited by dae33 : Friday 8th November 2019 at 13:31.