How do large "professional" telescopes create flats ?

[Christoph Puetz]

Dear community, as an amateur we can can create flats by "flatfield boxes", "T-Shirt method" or sky flats in the dawn.
My question is: How do professional scopes (i.e. > 1m diameter, i.e. Calar Alto) do this ?
Do the take "skyflats" with guiding turned off in order to clip resulting startrails out ??

Kind regards
Christoph

[Cosmick]

My question is: How do professional scopes (i.e. > 1m diameter, i.e. Calar Alto) do this ?
Do they take "skyflats" with guiding turned off in order to clip resulting startrails out ??

Yes. Both sky-flats and dome-flats.

http://iopscience.iop.org/article/10.1086/673440/pdf

[Christoph Puetz]

Thanks for the document. Nice to see how the professionals work.