Usage patterns
望遠鏡で〈物〉を見るto look at something through a telescope
I looked at the moon through a telescope.
望遠鏡を覗くto peer/look through a telescope
He peered through the telescope to observe the stars.
望遠鏡を〈場所〉に向けるto point a telescope at (a place/direction)
I pointed the telescope at the night sky.