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I guess it's just down to the percentage of the aperture that is blocked? There's an amusing picture where a large owl has blocked a substantial portion of the

by ajb 2y ago

I guess it's just down to the percentage of the aperture that is blocked? There's an amusing picture where a large owl has blocked a substantial portion of the view: https://apod.nasa.gov/apod/ap030401.html https://apod.nasa.gov/apod/ap030401.html

exitb 2y ago
Yes. Given enough distance, the obstructing object will start to come into focus, but if it's close, it just darkens the image. After all reflecting telescopes have a secondary mirror (along with its mount) permanently obstructing part of the primary mirror.
- DoctorOetker 2y ago
  This was not a telescope, it was an all sky camera, the caption explicitly states the owl scratched the optics with its claws.