Can you find the manufacturer and the model number of the camera that took the picture of this bus?
Note: The whole flag is in Upper Case letters and replace any special character or space with underscores.
Flag Format: KCTF{MANUFACTURER_MODEL_SINGLELETTERNUMBER}
I reversed search the image in yandex and found one russian page that contained it (http://fotobus.msk.ru/photo/267442/?vid=204172), scrolling down i found all the data of the bus and camera.
The flag is: KCTF{SONY_DSC_S980}