Turn on the “shoot without lens” option: https://fujifilm-dsc.com/en-int/manual/x-t3/menu_setup/button-dial_setting/index.html p.s. Welcome to the forum.

Hello! I want to make a stenope with my XT3, so I've turn out my camera lens and put in place lens cap with a little hole. Everything is ok on the screen but the shutter release doesn't work without a lens. So how shooting?

This might help or make things worse: https://fstoppers.com/astrophotography/compare-four-ultra-wide-angle-fast-aperture-aps-c-prime-lenses-622553 I am not sure why they stuck the article in their astro section, very little of the article is about astro.

The only way I can find to make the 240P somewhat acceptable is to be in bright conditions and get the ISO as low as possible.  Do not use Flog 2!  Minimum ISO is 1250 is too high for 240P.  Flog with a minimum ISO of 640 is OK.  You even might want to consider Eterna at the lowest ISO possible. It is my impression that FujiFilm laid an egg with the stacked sensor if your goal was to shoot 240P.  

Summer Swan... Starting in late summer, say late August or early September, the Cygnus Constellation is directly overhead ("Just Look Up") for folks in the Northern Hemisphere. As is usually the case with constellations, there are differing cultural views and fanciful tales about things going on in the skies.

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https://www.space.com/cygnus-constellation.html https://en.wikipedia.org/wiki/Cygnus_(constellation) https://www.constellation-guide.com/constellation-list/cygnus-constellation/ edit: This is the equivalent of 19 minutes of exposure.