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My astrophotography in the movie Project Hail Mary

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Re: My astrophotography in the movie Project Hail Mary

#211

Post by js2 »

js2 wrote: post #188
hermitcrab wrote: post #157

Earlier quoted context omitted.

What sort of magnification do you need to get photos like that?

The Redcat scope FL is 250 mm. The Askar scope FL is 1000 mm. The camera has an APS-C sensor (23.5 mm x 15.7 mm) giving it a crop factor of about 1.5x compared to 35 mm film (where 50mm is considered 1:1 human vision field of view). So: Redcat: 250 / 50 * 1.5 =7.5x magnification Askar : 1000 / 50 * 1.5 =30x magnification This is deep sky photography. Doesn't require lots of magnification. What it does require is dark…

> 50 mm Nikon SLR

35 mm obviously.

Re: My astrophotography in the movie Project Hail Mary

#213

Post by inaros »

altairprime wrote: post #176
inaros wrote: post #127

Earlier quoted context omitted.

https://astrobackyard.com/starnet-astrophotography/ “StarNet is a neural network that can remove stars from images in one simple step leaving only the background. More technically, it is a convolutional residual net with encoder-decoder architecture and with L1, Adversarial and Perceptual losses.”

Your citation is a valid copy-paste from the website linked, but you haven't yet replied to the assertions of the parent comment. Could you, in your own words rather than someone else's, speak more about your concerns and address those assertions?

>> Could you, in your own words rather than someone else's, speak more about your concerns and address those assertions?

If you remove the stars you have to fill it in with what is there..behind the star, but you cant possibly know.... It could be another star, a black hole etc...Since you have to make it nice to display movie credits, you are going to fill in the space with genai images similar to the rest of the background. You might draw curved to the right when in reality if you observe from behind the star, it curves to the left...

Re: My astrophotography in the movie Project Hail Mary

#214

Post by vintagedave »

knappe wrote: post #107
vintagedave wrote: post #34

Earlier quoted context omitted.

I'm curious how the starless versions are created. From the steps at the end, I couldn't see a 'this is how stars are removed' step. Maybe it's part of stacking (but most stars would remain present?) or the calibration process treating stars as noise?

Traditionally (pre-ai) you would use another image of the same part of the sky and negate the items that you want to remove from the image As an example terrestrial telescope mirrors get dusty. You're not going to break down the scope just to clean up the dust as this is a many days operation in most cases. So instead you would take "flats" that were of a pure white background and thus showed the dust in its full, du…

> Ask me how I know!

How do you know? :)

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