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A comment on SR-71 Blackbird Astro-Nav System (a.k.a. R2-D2) worked by tracking the stars. Parent comment

Re:SR-71 Blackbird Astro-Nav System (a.k.a. R2-D2) worked by... by gmiller123456 on Monday September 25, 2023 @08:58PM (#37652962)
That is for taking "dark frames". "Flat frames" need light going through the optics so that things like dust and vengetting can be detected.

This link explains them in more detail:

https://www.highpointscientific.com/astronomy-hub/post/astro...

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Re:SR-71 Blackbird Astro-Nav System (a.k.a. R2-D2) worked by... by photoGrant on Tuesday September 26, 2023 @04:23PM (#37665321)
You're right! I read too quick.

Instead, you want one of these!

https://support.phaseone.com/knowledgebase/article/KA-01239/...

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