i am trying to reduce noise with median stack filter but all the stars are smeared/blurred. Gear nikon D7100, Samyang 10mm, tripod, PS CC

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    Have you turned on automatic realignment to account for the apparent motion of the stars in the sky between each exposure? – Michael C Feb 14 '15 at 8:35
  • Nope i did not. Where can i find this setting? – Ter Mix Feb 15 '15 at 11:27
  • What software are you using to stack the images? That's were you would do alignment. – Michael C Feb 16 '15 at 6:07

The Earth rotates, which causes the stars to appear to move, which would be expected to cause them to appear blurry when the images are stacked. Consider using a program, such as align_image_stack to align the stars before stacking.

See Cannot align images with align_image_stack.

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