Andromeda covers about 50 mrad angle on the sky; at 30 s exposure time, you'd expect star trails of 2 mrad (1/25th of the size of Andromeda), which should be (just) visible at this resolution. And what other "techniques" are not of the "use photoshop" kind? - ThreadSky

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hk-nien.bsky.social • 209 days ago

Andromeda covers about 50 mrad angle on the sky; at 30 s exposure time, you'd expect star trails of 2 mrad (1/25th of the size of Andromeda), which should be (just) visible at this resolution.
And what other "techniques" are not of the "use photoshop" kind?

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ssamn.bsky.social•209 days ago

@fcain.bsky.social found the original source of the photo, they stacked 10 60s exposures from a tracking mount. https://www.reddit.com/r/EarthPorn/comments/d8js9z/comment/f1bunhv/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button

fcain.universetoday.com•209 days ago

So I'm assuming it's a composition, with one night shot of the mountain, and then a stacked set of sky images composited in Photoshop. That's perfectly legit as long as you explain the process and make it clear, but these unattributed photos don't give context.

hk-nien.bsky.social•209 days ago

A commenter in the reddit topic on how to do this: '... you need to "fake" the proportions, to make the background smaller or the foreground bigger to hide the smear of the mountain in the rotated long exposure.'

I rest my case, but good to know that it wasn't an AI fake. 🙂
@ssamn.bsky.social

hk-nien.bsky.social•209 days ago

Oh and @astronomers.bsky.social : the photographer wrote:
"Please credit my via my Instagram username if you share this photo anywhere"
https://instagram.com/messner_photo

fcain.universetoday.com•209 days ago

Oh yeah, that'll get respected. :-(

ssamn.bsky.social•209 days ago

Yeah, makes sense. I found a buried comment from the OP on that post saying El Capitan was shot separately an hour before the sky.

ssamn.bsky.social•209 days ago

Put the camera on an equatorial mount, trailing is more noticeable on the stars than the landscape. That might not work as well in this case though because there’s a detailed foreground object instead of just a horizon silhouette.

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