Prepositions

Trevor,

Good question.  Both prepositions are correct, but it sometimes depends on the context.  Can you give us a full sentence, or a few sentences, so we can help you further? 

Trevor,

Thanks for providing an example sentence.  (ICYMI, Trevor provided the sentence The painting is best admired from/at a distance in a follow-up comment.)

When describing the act of observing, watching, looking at, or viewing something, the correct preposition is from, not at.  The painting is best admired from a distance.