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A comment on Hubble takes gigantic image of the Triangulum Galaxy. Parent comment

Re:Hubble takes gigantic image of the Triangulum Galaxy by varjag on Thursday January 10, 2019 @03:41AM (#18872434)
Easily. Which focal length/field of view lens is on that camera?
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Re:Hubble takes gigantic image of the Triangulum Galaxy by TheSpiceIsLife on Thursday January 10, 2019 @06:07AM (#18873010)
I would have thought all these stars and galaxies are at optical-infinity?
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Re:Hubble takes gigantic image of the Triangulum Galaxy by EForEndeavour on Thursday January 10, 2019 @11:35AM (#18875148)
True, and focal length is in fact defined (or at least thought of) under the assumption of parallel light rays coming in from an optically infinite distance. https://en.wikipedia.org/wiki/Focal_length
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Re:Hubble takes gigantic image of the Triangulum Galaxy by varjag on Friday January 11, 2019 @09:36AM (#18883794)
Yes? The sensor is not at optical infinity however, and the focal length determines the field of view you get. Quite clearly, one pixel of a camera with 0.001 degree angular resolution and the one of 10 degree FOV give you very different results.
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