20161204_z_ngc1944_california_nebula_stack1_crop_dss1_psc_nostars075The sky allowed only very few exposures on this object, and the -8°C temperature was somewhat unforgiving. In order to cancel out a known lens error (the lens seems to be off a bit from the ideal perpendicular), I rotated the gear 180 degrees at half of the session.

Canon 1100D mod, 14×2 min, ISO 1600, Canon EF 200mm f/2.8L II USM at f/4, HEQ5, Dângău Mare

raw sample

raw sample

stack – with almost 180 deg rotation :P

stack – with almost 180 deg rotation :P

cropped, ready for the stars to be healed

cropped, ready for the stars to be healed

the mask produced

the mask produced

the almost no stars version

the almost no stars version

the original version with all the stars

the original version with all the stars

final: 75% no stars

final: 75% no stars

 

 
Top (displayed with ... opacity, slide to change): maximum reduction
bottom: all the stars
 

 

facebooktwittergoogle_plusredditpinterestlinkedinmail