ngc6888 -Crescent nebula ,is an emission nebula in constellation Cygnus ,about 5000 light years away from Earth. It wat discovered byFriedrich William Herschel in 1792
astrophoto with:-Astrotech telescopeR.C.6 inches f9,Astro Physics0.67 reducer  ,mount Skywatcher HEQ5 pro guided. Photo camera Atik314L+color ccd ,guide cam ZWOasi120mm mono.,guide-scope Skywatcher 70x500mm, exposures 4x800 sec HA filter( Astronomik ),and 5x600 sec Luminance (Astronomik).

location :Santorini (Kamari) -GREECE -22 june 2017.

M16 - in HA
4x600 sec.