Digital zoom 2x, spotting scopes (budget price range): Bresser Spektar 15-45x60, ZRT 457M 30/60x70, Levenhuk Blaze Plus 25-75x90
The image is scharper if seen with naked eyes, the shaking is due to hand held recording, in my opinion all these spotting scopes are good for their price, the premium quality is IMHO 5 times more expensive but its imige is only 20% better.