they captured it using event horizon telescope with 55 million distance away, and the black hole is as large as our solar system it is located in our center galaxy
because of the image is capture not in real distance we can only see the shadow of it which is not very sharp, they didnt take a photo, they collected data about the black holes and are piecing together an illustration as to what the black hole probably looks like, the same way that a photo is just data collected ant stitched together, except here you are limited by distance and current technology.
theyre using interferometry, so they will get a real image once they process their data.
but they said the actual black hole will look like the "Interstellar" movie black hole
also heres an interesting video about what we can get from this event