this post was submitted on 06 Dec 2023
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What if we aimed the Hubble Telescope at Earth? - Minute Earth are working together with xkcd to animate "What If" questions! (www.youtube.com)
submitted 11 months ago by [email protected] to c/[email protected]
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[โ€“] [email protected] 3 points 11 months ago (1 children)

Is focus to infinity that different for these types of scopes compared to a conventional camera which focuses to infinity after a couple hundred metres? I would have thought the draw back would be the focal lengths giving you a very small area in frame.

[โ€“] [email protected] 1 points 11 months ago* (last edited 11 months ago)

Focal length and aperture both affect how much focus matters.

Also with most regular cameras, from what I've heard they actually have their max focus slightly past infinity to account for thermal expansion so the general advice for doing astrophotography is to focus on the subject, not just whacking it to infinity.