When the Hubble telescope was launched is had an improperly ground mirror resulting in fuzzy images. There was a test that would have caught the problem on the

When the Hubble telescope was launched is had an improperly ground mirror resulting in fuzzy images. There was a test that would have caught the problem on the ground, I recall reading that it would have cost $10 million, but it was skipped to limit the project's budget. Instead it required a multi-hundred million dollar shuttle mission to give the Hubble corrective lenses.