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Sulla sua pagina FB, Julian Wessel dice così. Credo possa rispondere a qualche domanda.
A me viene un altro fortissimo dubbio. La ISS è dannatamente luminosa, l'abbiamo vista tutti. Saturno non è mai così luminoso. Quindi come fa ad averli esposti correttamente nel medismo frame?
Hi,it's Julian Wessel (J.W.Astronomy)To make things clear I wanted to say that the APOD picture of Saturn and ISS is a composition of 2 Frames from different capturing session. They're both overlayed and processed to make the event as detailed as possible.I'm sorry to all the astronomers feeling betrayed, this was not my intention. I just wanted to top my Jupiter transit and failed by overprocessing this image. Nevertheless I will prove that it's possible to make this catch as perfect as shown. It's all a matter of planning and knowing his equipment. And I know I can do this. I'm one and a half year into astrophotography now and this is a mistake I won't do again! I've learned from it.Sorry!
Appreciate your mea culpa Julian, however it's not only a question of planning and hardware, it's also a question of law of physics. To freeze the movement of the ISS, you need an exposure of 1 millisecond or less, and all experienced imagers know that then Saturn is totally underexposed, unsharp and full of noise. Exposure times are incompatible to get both objects nice together. No way to obtain such Saturn without multi-frame stacking, and then one is obliged to copy/paste of the ISS in front of it...which is well beyond (my) imaging deontology.In addition, the probability to have one ISS exactly in front of the disk of the planet (both laterally and longitudinally) is...epsilon
"which is well beyond (my) imaging deontology" - kudos to Thierry
APOD è stato molto, molto criticato di recente (anche per altre foto)